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I had other doubts, too. It seemed hubristic, or worse, to make multitrillion-dollar policy bets based on computer models trying to forecast climate patterns decades into the future. Climate activists kept promoting policies based on technologies that were either far from mature (solar energy) or sometimes actively harmful (biofuels).

Expensive efforts to curb greenhouse gas emissions in Europe and North America seemed particularly fruitless when China, India and other developing countries weren’t about to curb their own appetite for fossil fuels

just how fast is Greenland’s ice melting right now? Is this an emergency for our time, or is it a problem for the future?

His pitch was simple: The coastline we have taken for granted for thousands of years of human history changed rapidly in the past on account of natural forces — and would soon be changing rapidly and disastrously by man-made ones. A trip to Greenland, which holds one-eighth of the world’s ice on land (most of the rest is in Antarctica) would show me just how drastic those changes have been. Would I join him?

Greenland is about the size of Alaska and California combined and, except at its coasts, is covered by ice that in places is nearly two miles thick. Even that’s only a fraction of the ice in Antarctica, which is more than six times as large

Greenland’s ice also poses a nearer-term risk because it is melting faster. If all its ice were to melt, global sea levels would rise by some 24 feet. That would be more than enough to inundate hundreds of coastal cities in scores of nations, from Jakarta and Bangkok to Copenhagen and Amsterdam to Miami and New Orleans.

There was also a millenarian fervor that bothered me about climate activism, with its apocalyptic imagery (the Statue of Liberty underwater) and threats of doom unless we were willing to live far more frugally.

“We haven’t had a good positive mass balance year since the late 1990s,” he told me in a follow-on email when I asked him to explain the data for me. The losses can vary sharply by year. The annualized average over the past 30 years, he added, is 170 gigatons per year. That’s the equivalent of about 5,400 tons of ice loss per second. That “suggests that Greenland ice loss has been tracking the I.P.P.C. worse-case, highest-carbon-emission scenario.

The data shows unmistakably that Greenland’s ice is not in balance. It is losing far more than it is gaining.

scientists have been drilling ice-core samples from Greenland for decades, giving them a very good idea of climatic changes stretching back thousands of years. Better yet, a pair of satellites that detect anomalies in Earth’s gravity fields have been taking measurements of the sheet regularly for nearly 20 years, giving scientists a much more precise idea of what is happening.

it’s hard to forecast with any precision what that means. “Anyone who says they know what the sea level is going to be in 2100 is giving you an educated guess,” said NASA’s Willis. “The fact is, we’re seeing these big ice sheets melt for the first time in history, and we don’t really know how fast they can go.”

His own educated guess: “By 2100, we are probably looking at more than a foot or two and hopefully less than seven or eight feet. But we are struggling to figure out just how fast the ice sheets can melt. So the upper end of range is still not well known.”

On the face of it, that sounds manageable. Even if sea levels rise by eight feet, won’t the world have nearly 80 years to come to grips with the problem, during which technologies that help us mitigate the effects of climate change while adapting to its consequences are likely to make dramatic advances?

Won’t the world — including countries that today are poor — become far richer and thus more capable of weathering the floods, surges and superstorms?

The average rate at which sea level is rising around the world, he estimates, has more than tripled over the past three decades, to five millimeters a year from 1.5 millimeters. That may still seem minute, yet as the world learned during the pandemic, exponential increases have a way of hitting hard.

“When something is on a straight line or a smooth curve, you can plot its trajectory,” Englander said. “But sea level, like earthquakes and mudslides, is something that happens irregularly and can change rather quickly and surprise us. The point is, you can no longer predict the future by the recent past.”

In The Wall Street Journal’s editorial pages, where I used to work, the theoretical physicist Steven Koonin, a former under secretary for science in the Obama administration’s Energy Department, cast doubt on the threat from Thwaites in a voice that could have once been mine. He also thinks the risks associated with Greenland’s melting are less a product of human-induced global warming than of natural cycles in North Atlantic currents and temperatures, which over time have a way of regressing to the mean.

Even the poorest countries, while still unacceptably vulnerable, are suffering far fewer human and economic losses to climate-related disasters.

Another climate nonalarmist is Roger Pielke Jr., a professor of environmental studies at the University of Colorado Boulder. I call Pielke a nonalarmist rather than a skeptic because he readily acknowledges that the challenges associated with climate change, including sea-level rise, are real, serious and probably unstoppable, at least for many decades.

“If we have to have a problem,” he told me when I reached him by phone, “we probably want one with a slow onset that we can see coming. It’s not like an asteroid coming from space.”

“Since the 1940s, the impact of floods as a proportion of U.S. gross domestic product has dropped by 70 percent-plus,” Pielke said. “We see this around the world, across phenomena. The story is that fewer people are dying and we are having less damage proportional to G.D.P.”

“Much climate reporting today highlights short-term changes when they fit the narrative of a broken climate but then ignores or plays down changes when they don’t, often dismissing them as ‘just weather,’” he wrote in February.

Global warming is real and getting worse, Pielke said, yet still it’s possible that humanity will be able to adapt to, and compensate for, its effects.

A few years ago, I would have found voices like Koonin’s and Pielke’s persuasive. Now I’m less sure. What intervened was a pandemic.

That’s what I thought until the spring of 2020, when, along with everyone else, I experienced how swiftly and implacably nature can overwhelm even the richest and most technologically advanced societies. It was a lesson in the sort of intellectual humility I recommended for others

It was also a lesson in thinking about risk, especially those in the category known as high-impact, low-probability events that seem to be hitting us with such regularity in this century: the attacks of Sept. 11, 2001; the tsunamis of 2004 and 2011, the mass upheavals in the Arab world

What if the past does nothing to predict the future? What if climate risks do not evolve gradually and relatively predictably but instead suddenly soar uncontrollably? How much lead time is required to deal with something like sea-level rise? How do we weigh the risks of underreacting to climate change against the risks of overreacting to it?

I called Seth Klarman, one of the world’s most successful hedge-fund managers, to think through questions of risk. While he’s not an expert on climate change, he has spent decades thinking deeply about every manner of risk

And we will almost certainly have to do it from sources other than Russia, China, the Democratic Republic of Congo and other places that pose unacceptable strategic, environmental or humanitarian risks

“If you face something that is potentially existential,” he explained, “existential for nations, even for life as we know it, even if you thought the risk is, say, 5 percent, you’d want to hedge against it.”

“One thing we try to do,” he said, “is we buy protection when it’s really inexpensive, even when we think we may well not need it.” The forces contributing to climate change, he noted, echoing Englander, “might be irreversible sooner than the damage from climate change has become fully apparent. You can’t say it’s far off and wait when, if you had acted sooner, you might have dealt with it better and at less cost. We have to act now.”

In other words, an ounce of prevention is worth a pound of cure. That’s particularly true if climate change is akin to cancer — manageable or curable in its earlier stages, disastrous in its later ones.

As I’ve always believed, knowing there is grave risk to future generations — and expecting current ones to make immediate sacrifices for it — defies most of what we know about human nature. So I began to think more deeply about that challenge, and others.

For the world to achieve the net-zero goal for carbon dioxide emissions by 2050, according to the International Energy Agency, we will have to mine, by 2040, six times the current amounts of critical minerals — nickel, cobalt, copper, lithium, manganese, graphite, chromium, rare earths and other minerals and elements — needed for electric vehicles, wind turbines and solar panels.

The poster child for this kind of magical thinking is Germany, which undertook a historic Energiewende — “energy revolution” — only to come up short. At the turn of the century, Germany got about 85 percent of its primary energy from fossil fuels. Now it gets about 78 percent, a puny reduction, considering that the country has spent massive sums on renewables to increase the share of electricity it generates from them.

As in everything else in life, so too with the environment: There is no such thing as a free lunch. Whether it’s nuclear, biofuels, natural gas, hydroelectric or, yes, wind and solar, there will always be serious environmental downsides to any form of energy when used on a massive scale. A single industrial-size wind turbine, for instance, typically requires about a ton of rare earth metals as well as three metric tons of copper, which is notoriously destructive and dirty to mine.

no “clean energy” solution will easily liberate us from our overwhelming and, for now, inescapable dependence on fossil fuels.

Nobody brings the point home better than Vaclav Smil, the Canadian polymath whose most recent book, “How the World Really Works,” should be required reading for policymakers and anyone else interested in a serious discussion about potential climate solutions.

“I’ve talked to so many experts and seen so much evidence,” he told me over Zoom, “I’m convinced the climate is changing, and addressing climate change has become a philanthropic priority of mine.”

Things could turn a corner once scientists finally figure out a technical solution to the energy storage problem. Or when governments and local actors get over their NIMBYism when it comes to permitting and building a large energy grid to move electricity from Germany’s windy north to its energy-hungry south. Or when thoughtful environmental activists finally come to grips with the necessity of nuclear energy

Till then, even as I’ve come to accept the danger we face, I think it’s worth extending the cancer metaphor a little further: Just as cancer treatments, when they work at all, can have terrible side effects, much the same can be said of climate treatments: The gap between an accurate diagnosis and effective treatment remains dismayingly wide

Only when countries like Vietnam and China turned to a different model, of largely bottom-up, market-driven development, did hundreds of millions of people get lifted out of destitution.

the most important transformation has come in agriculture, which uses about 70 percent of the world’s freshwater supply.

Farmers gradually adopted sprinkler and drip irrigation systems, rather than more wasteful flood irrigation, not to conserve water but because the technology provided higher crop yields and larger profit margins.

Water shortages “will spur a revolutionary, aggressive approach to getting rid of flood irrigation,” said Seth Siegel, the chief sustainability officer of the Israeli AgTech company N-Drip. “Most of this innovation will be driven by free-market capitalism, with important incentives from government and NGOs.

meaningful environmental progress has been made through market forces. In this century, America’s carbon dioxide emissions across fuel types have fallen to well below 5,000 million metric tons per year, from a peak of about 6,000 million in 2007, even as our inflation-adjusted G.D.P. has grown by over 50 percent and total population by about 17 percent.

1) Engagement with critics is vital. Insults and stridency are never good tools of persuasion, and trying to cow or censor climate skeptics into silence rarely works

the biggest single driver in emissions reductions from 2005 to 2017 was the switch from coal to natural gas for power generation, since gas produces roughly half the carbon dioxide as coal. This, in turn, was the result of a fracking revolution in the past decade, fiercely resisted by many environmental activists, that made the United States the world’s largest gas producer.

In the long run, we are likelier to make progress when we adopt partial solutions that work with the grain of human nature, not big ones that work against it

Renewables, particularly wind power, played a role. So did efficiency mandates.

The problem with our civilization isn’t overconfidence. It’s polarization, paralysis and a profound lack of trust in all institutions, including the scientific one

Devising effective climate policies begins with recognizing the reality of the social and political landscape in which all policy operates. Some thoughts on how we might do better:

They may not be directly related to climate change but can nonetheless have a positive impact on it. And they probably won’t come in the form of One Big Idea but in thousands of little ones whose cumulative impacts add up.

2) Separate facts from predictions and predictions from policy. Global warming is a fact. So is the human contribution to it. So are observed increases in temperature and sea levels. So are continued increases if we continue to do more of the same. But the rate of those increases is difficult to predict even with the most sophisticated computer modeling

3) Don’t allow climate to become a mainly left-of-center concern. One reason the topic of climate has become so anathema to many conservatives is that so many of the proposed solutions have the flavor, and often the price tag, of old-fashioned statism

4) Be honest about the nature of the challenge. Talk of an imminent climate catastrophe is probably misleading, at least in the way most people understand “imminent.”

A more accurate description of the challenge might be a “potentially imminent tipping point,” meaning the worst consequences of climate change can still be far off but our ability to reverse them is drawing near. Again, the metaphor of cancer — never safe to ignore and always better to deal with at Stage 2 than at Stage 4 — can be helpful.

5) Be humble about the nature of the solutions. The larger the political and financial investment in a “big fix” response to climate change on the scale of the Energiewende, the greater the loss in time, capital and (crucially) public trust when it doesn’t work as planned

6) Begin solving problems our great-grandchildren will face. Start with sea-level rise

We can also stop providing incentives for building in flood-prone areas by raising the price of federal flood insurance to reflect the increased risk more accurately.

7) Stop viewing economic growth as a problem. Industrialization may be the leading cause of climate change. But we cannot and will not reverse it through some form of deindustrialization, which would send the world into poverty and deprivation

8) Get serious about the environmental trade-offs that come with clean energy. You cannot support wind farms but hinder the transmission lines needed to bring their power to the markets where they are needed.

9) A problem for the future is, by its very nature, a moral one. A conservative movement that claims to care about what we owe the future has the twin responsibility of setting an example for its children and at the same time preparing for that future.

Liberals aren’t watching “Yellowstone” for cultural reasons, and conservatives love it for ideological ones, he said.

I watched all four seasons of “Yellowstone” through the lens of these asymmetries. The show is compelling but not groundbreaking. It is too easy to call it a conservative show. Like its audience counterpart, “Yellowstone” thinks it is at war with progress when it is really at war with itself.

when it comes to identity and tastes, Childress said it is a “mark of social status for liberals to be culturally omnivorous.”

In contrast, conservative audiences do not consider reading, watching or listening around a mark of status or identity. And they are more likely to dislike what liberals like than liberals are to dislike what conservatives like.

“People on the left like more pop culture than people on the right,’’ Childress said. “And people on the left don’t dislike what people on the right dislike.

The rejection of cosmopolitanism as a desirable attribute is more subtle, but present

The West of “Yellowstone” is multiethnic, multiracial and multi-class. There are Black cowboys and complex Native American characters. A pair of lesbians even makes an appearance in Season 2 (although there are no gay cowboys,

Regardless of whether you agree with the classification, you have an idea of what other people mean by “elite”: urban, sophisticated and educated. In short, the things that “Yellowstone” skewers at every opportunity. The characters despise California and San Francisco in particular

It accommodates feminism by making women the most vicious capitalist actors.

The slow dialogue of “Yellowstone” also rejects sophistication. The narrative plods even as the show’s many horses run. And the mood is dour; there aren’t many jokes

Those aesthetic choices implicitly argue for simplicity as a moral virtue, something John Dutton telegraphs when he tells a field hand that sometimes the world really is simple.

“Yellowstone” sidesteps Westerns’ romanticization of the white imaginary. At dinner last week with my family, my 30-something Black lesbian cousins gushed about the show, although they prefer its Native American characters to the Duttons.

There are few strivers in the world of “Yellowstone.” The show’s royalty grudgingly accept higher education as a strategic tool to beat the liberal do-gooders. The poor and disenfranchised don’t dream of going to college at all.

the show’s revenge is how well it exposes the material conditions of elitism. Its worldview resembles fantasy but it is brutally realistic about how power operates.

Whatever brings its audience to the show, once they arrive, they are playacting within the vision of America that “Yellowstone” holds. The show suggests that elitism and power can be reconciled with our need to be both moral and self-interested. It is a seductive fantasy because it does not ask the audience to give up anything.

The nominal diversity of the show’s cast implies that conservatives don’t hate anyone, as long as everyone is willing to conform to their way of life

It acknowledges white land theft and Native American grievance, but it does not make a case for reparations.

It accepts that Christopher Columbus was a colonizer but implies that the Duttons’ good-enough ends justify the means.

If the show rejects sophistication, it takes a hammer to education

And it depicts the police as feckless, but it does not want to abolish cops. It wants to choose the cops. That means a lot of guns.

“Yellowstone” does not just have gunfights. It has all-out wars. There are military-grade weapons, aerial assaults, night-vision goggles and automatic rifles. When John Dutton cannot win, he starts shooting.

“Yellowstone” isn’t ideologically driven, even if ideology is what makes it so comforting for conservative audiences.

in the end, the show shares a problem with Republican Party electoral politics: Neither offers a compelling vision of the future.

Republicans don’t solve problems like climate change or economic inequality or water rights or housing costs or stagnant wages. With Donald Trump and Mitch McConnell’s leadership, the G.O.P. does not even bother to sell a conservative story for America. Audiences looking for that vision in “Yellowstone” might find that cosmetic diversity needn’t be scary, but they won’t find much else.

Like Republicans, the Dutton dynasty has one defense against demography and time: Buy guns and hoard stolen power.

It works like this: Hardcore base voters want to watch media that confirms all their priors and then some. —> So fringe media outlets get traction with Republican audiences. —> GOP politicians need to go on these media outlets in order to reach base voters. —> The more politicians go on these fringe shows, the more mainstream these outlets become. —> Which creates competition for right-wing news outlets that are one standard deviation more sane, forcing those media outlets to get crazier just to stay on par.

Over time, the whole mutually reinforcing, mutually radicalizing process creates the conditions necessary for 70 percent of the Republican party to sincerely believe that Joe Biden is an illegitimate president due to a rigged election

It’s hard to blame voters for believing a lie when every politician they see and media personality they trust is repeating it.

the first hints of hell come from hubris. The self-styled “Technoking” has every reason for self-belief. Tesla is the world’s most valuable carmaker. SpaceX is literally rocket science in action. Yet for executives like him it’s a fine line from that to overconfidence. Sony’s Morita Akio crossed it. So did AOL’s Steve Case and RBS’s Fred Goodwin

The corollary of hubris is sloppy financing, another attribute of top-of-the-market megaflops. This is particularly true at the tail end of bull markets

as with many M&A deals, deteriorating markets can turn a flawed acquisition into a disaster. That possibility must haunt Mr Musk. The digital-advertising market on which Twitter depends has crumbled. Tesla’s own shares, the source of most of his wealth, have lost a third of their value since he made the bid (don’t cry for him, he is still worth $220bn). The deal financing includes $13bn of high-risk debt and spreads on this kind of instrument have soared

the repercussions are likely to be troubling. Either banks are stuck with hard-to-sell debt and suffer hefty losses or, in the unlikely event that they abandon the deal, a superhero of 21st-century capitalism faces a $44bn day of reckoning

Finally there is strategy. In Mr Bruner’s analysis, the worst M&A deals are done when the target is in an industry far beyond the acquirer’s “domain knowledge”. That is surely true of Mr Musk and Twitter

it also has a hellish side. It could pit the world’s most powerful businessman against tech regulators. It could stir up trouble geopolitically (imagine a reinstated Donald Trump weighing in, as Mr Musk has done, on Russia and Ukraine). And it could enrage China, thwarting Tesla’s prospects there. Another deal for the history books, no doubt

Monday’s rampage in Illinois marked the 15th time this year that four or more people were killed in a shootin

Of the 90,498 gun deaths in 2020 and 2021, 38,796 were homicides. Nearly 21,000 of those victims were Black men.

In 2020, while the overall crime rate nationwide fell, “that was not true for shootings,” Cook said. That year, he said, there was an “unparalleled” surge in people killed by firearms compared with 2019.

Solving more shootings, particularly nonfatal ones, “would interrupt the cycle of retaliation,” Cook said, and might improve local trust in the police. “That would be a productive use of money,” he said.

Police nationwide in 2020 “cleared” about half of all homicides, according to the FBI, which usually means that someone was arrested and charged or the case was closed another way, including the death of the attacker.

But three decades of research has established that people with mental illness are responsible for just a small percentage of interpersonal and gun violence.

“Anybody who shoots somebody else has a mental health challenge. Period,” Texas Gov. Greg Abbott (R) said shortly after the Uvalde shooting in May.

It’s clear that many other factors are more closely associated with gun violence than mental illness. They include experiencing trauma and violence during childhood, being young and male, living in neighborhoods where violence is more prevalent, poor impulse control, poor anger control, and perhaps most of all, easy access to a firearm.

There is one major, well-established connection between mental illness and gun violence: suicide.

officials must help create environments where there is less trauma in the home, support families and strengthen services for children in schools.

In 1994, Duke University gun violence researcher Jeffrey W. Swanson calculated that if all active psychotic and mood disorders were eliminated overnight, interpersonal violence would be reduced by just 4 percent

“We don’t have gun control as much as we have people control,” he said. “We try to figure out the people who are so dangerous that we have to limit their access to guns.”

In many other countries, guns are tightly restricted, but the United States has taken a different route, he said.

people in Florida with serious mental illnesses, including some who were committed to a psychiatric facility involuntarily or for a short-term emergency hold, 0.9 percent were arrested for a violent crime involving a gun within seven years — about the same rate as the general population.

The 1998 MacArthur Violence Risk Assessment Study, which followed 951 people who had been released from three psychiatric facilities, found that 23 committed 67 acts of interpersonal gun violence — a rate of 2 percent — in the next year. Just 19 of those acts, committed by nine people, were against strangers.

The consistent invocations of mental health after massacres such as those in Buffalo, Uvalde and Highland Park are ways for officials to distance themselves from the horror of the event, to explain the unfathomable,

“It’s a tragedy that demands explanation, and the stigma of mental illness is something that fuels pseudo-explanations,” she said. “It’s a fake explanation. Why has this man done this terrible thing? The answer is because he’s mentally ill. How do you know he’s mentally ill? Because he’s done this terrible thing.”

“Security and privacy have long been top companywide priorities at Twitter,” said Twitter spokeswoman Rebecca Hahn. She said that Zatko’s allegations appeared to be “riddled with inaccuracies” and that Zatko “now appears to be opportunistically seeking to inflict harm on Twitter, its customers, and its shareholders.” Hahn said that Twitter fired Zatko after 15 months “for poor performance and leadership.” Attorneys for Zatko confirmed he was fired but denied it was for performance or leadership.

the whistleblower document alleges the company prioritized user growth over reducing spam, though unwanted content made the user experience worse. Executives stood to win individual bonuses of as much as $10 million tied to increases in daily users, the complaint asserts, and nothing explicitly for cutting spam.

Chief executive Parag Agrawal was “lying” when he tweeted in May that the company was “strongly incentivized to detect and remove as much spam as we possibly can,” the complaint alleges.

Zatko described his decision to go public as an extension of his previous work exposing flaws in specific pieces of software and broader systemic failings in cybersecurity. He was hired at Twitter by former CEO Jack Dorsey in late 2020 after a major hack of the company’s systems.

“I felt ethically bound. This is not a light step to take,” said Zatko, who was fired by Agrawal in January. He declined to discuss what happened at Twitter, except to stand by the formal complaint. Under SEC whistleblower rules, he is entitled to legal protection against retaliation, as well as potential monetary rewards.

A person familiar with Zatko’s tenure said the company investigated Zatko’s security claims during his time there and concluded they were sensationalistic and without merit. Four people familiar with Twitter’s efforts to fight spam said the company deploys extensive manual and automated tools to both measure the extent of spam across the service and reduce it.

In 1998, Zatko had testified to Congress that the internet was so fragile that he and others could take it down with a half-hour of concentrated effort. He later served as the head of cyber grants at the Defense Advanced Research Projects Agency, the Pentagon innovation unit that had backed the internet’s invention.

Overall, Zatko wrote in a February analysis for the company attached as an exhibit to the SEC complaint, “Twitter is grossly negligent in several areas of information security. If these problems are not corrected, regulators, media and users of the platform will be shocked when they inevitably learn about Twitter’s severe lack of security basics.”

Zatko’s complaint says strong security should have been much more important to Twitter, which holds vast amounts of sensitive personal data about users. Twitter has the email addresses and phone numbers of many public figures, as well as dissidents who communicate over the service at great personal risk.

This month, an ex-Twitter employee was convicted of using his position at the company to spy on Saudi dissidents and government critics, passing their information to a close aide of Crown Prince Mohammed bin Salman in exchange for cash and gifts.

Zatko’s complaint says he believed the Indian government had forced Twitter to put one of its agents on the payroll, with access to user data at a time of intense protests in the country. The complaint said supporting information for that claim has gone to the National Security Division of the Justice Department and the Senate Select Committee on Intelligence. Another person familiar with the matter agreed that the employee was probably an agent.

“Take a tech platform that collects massive amounts of user data, combine it with what appears to be an incredibly weak security infrastructure and infuse it with foreign state actors with an agenda, and you’ve got a recipe for disaster,” Charles E. Grassley (R-Iowa), the top Republican on the Senate Judiciary Committee,

Many government leaders and other trusted voices use Twitter to spread important messages quickly, so a hijacked account could drive panic or violence. In 2013, a captured Associated Press handle falsely tweeted about explosions at the White House, sending the Dow Jones industrial average briefly plunging more than 140 points.

After a teenager managed to hijack the verified accounts of Obama, then-candidate Joe Biden, Musk and others in 2020, Twitter’s chief executive at the time, Jack Dorsey, asked Zatko to join him, saying that he could help the world by fixing Twitter’s security and improving the public conversation, Zatko asserts in the complaint.

The complaint — filed last month with the Securities and Exchange Commission and the Department of Justice, as well as the FTC — says thousands of employees still had wide-ranging and poorly tracked internal access to core company software, a situation that for years had led to embarrassing hacks, including the commandeering of accounts held by such high-profile users as Elon Musk and former presidents Barack Obama and Donald Trump.

But at Twitter Zatko encountered problems more widespread than he realized and leadership that didn’t act on his concerns, according to the complaint.

Twitter’s difficulties with weak security stretches back more than a decade before Zatko’s arrival at the company in November 2020. In a pair of 2009 incidents, hackers gained administrative control of the social network, allowing them to reset passwords and access user data. In the first, beginning around January of that year, hackers sent tweets from the accounts of high-profile users, including Fox News and Obama.

Several months later, a hacker was able to guess an employee’s administrative password after gaining access to similar passwords in their personal email account. That hacker was able to reset at least one user’s password and obtain private information about any Twitter user.

Twitter continued to suffer high-profile hacks and security violations, including in 2017, when a contract worker briefly took over Trump’s account, and in the 2020 hack, in which a Florida teen tricked Twitter employees and won access to verified accounts. Twitter then said it put additional safeguards in place.

This year, the Justice Department accused Twitter of asking users for their phone numbers in the name of increased security, then using the numbers for marketing. Twitter agreed to pay a $150 million fine for allegedly breaking the 2011 order, which barred the company from making misrepresentations about the security of personal data.

After Zatko joined the company, he found it had made little progress since the 2011 settlement, the complaint says. The complaint alleges that he was able to reduce the backlog of safety cases, including harassment and threats, from 1 million to 200,000, add staff and push to measure results.

But Zatko saw major gaps in what the company was doing to satisfy its obligations to the FTC, according to the complaint. In Zatko’s interpretation, according to the complaint, the 2011 order required Twitter to implement a Software Development Life Cycle program, a standard process for making sure new code is free of dangerous bugs. The complaint alleges that other employees had been telling the board and the FTC that they were making progress in rolling out that program to Twitter’s systems. But Zatko alleges that he discovered that it had been sent to only a tenth of the company’s projects, and even then treated as optional.

“If all of that is true, I don’t think there’s any doubt that there are order violations,” Vladeck, who is now a Georgetown Law professor, said in an interview. “It is possible that the kinds of problems that Twitter faced eleven years ago are still running through the company.”

“Agrawal’s Tweets and Twitter’s previous blog posts misleadingly imply that Twitter employs proactive, sophisticated systems to measure and block spam bots,” the complaint says. “The reality: mostly outdated, unmonitored, simple scripts plus overworked, inefficient, understaffed, and reactive human teams.”

One current and one former employee recalled that incident, when failures at two Twitter data centers drove concerns that the service could have collapsed for an extended period. “I wondered if the company would exist in a few days,” one of them said.

The current and former employees also agreed with the complaint’s assertion that past reports to various privacy regulators were “misleading at best.”

For example, they said the company implied that it had destroyed all data on users who asked, but the material had spread so widely inside Twitter’s networks, it was impossible to know for sure

As the head of security, Zatko says he also was in charge of a division that investigated users’ complaints about accounts, which meant that he oversaw the removal of some bots, according to the complaint. Spam bots — computer programs that tweet automatically — have long vexed Twitter. Unlike its social media counterparts, Twitter allows users to program bots to be used on its service: For example, the Twitter account @big_ben_clock is programmed to tweet “Bong Bong Bong” every hour in time with Big Ben in London. Twitter also allows people to create accounts without using their real identities, making it harder for the company to distinguish between authentic, duplicate and automated accounts.

In the complaint, Zatko alleges he could not get a straight answer when he sought what he viewed as an important data point: the prevalence of spam and bots across all of Twitter, not just among monetizable users.

Zatko cites a “sensitive source” who said Twitter was afraid to determine that number because it “would harm the image and valuation of the company.” He says the company’s tools for detecting spam are far less robust than implied in various statements.

The complaint also alleges that Zatko warned the board early in his tenure that overlapping outages in the company’s data centers could leave it unable to correctly restart its servers. That could have left the service down for months, or even have caused all of its data to be lost. That came close to happening in 2021, when an “impending catastrophic” crisis threatened the platform’s survival before engineers were able to save the day, the complaint says, without providing further details.

The four people familiar with Twitter’s spam and bot efforts said the engineering and integrity teams run software that samples thousands of tweets per day, and 100 accounts are sampled manually.

Some employees charged with executing the fight agreed that they had been short of staff. One said top executives showed “apathy” toward the issue.

Zatko’s complaint likewise depicts leadership dysfunction, starting with the CEO. Dorsey was largely absent during the pandemic, which made it hard for Zatko to get rulings on who should be in charge of what in areas of overlap and easier for rival executives to avoid collaborating, three current and former employees said.

For example, Zatko would encounter disinformation as part of his mandate to handle complaints, according to the complaint. To that end, he commissioned an outside report that found one of the disinformation teams had unfilled positions, yawning language deficiencies, and a lack of technical tools or the engineers to craft them. The authors said Twitter had no effective means of dealing with consistent spreaders of falsehoods.

Dorsey made little effort to integrate Zatko at the company, according to the three employees as well as two others familiar with the process who spoke on the condition of anonymity to describe sensitive dynamics. In 12 months, Zatko could manage only six one-on-one calls, all less than 30 minutes, with his direct boss Dorsey, who also served as CEO of payments company Square, now known as Block, according to the complaint. Zatko allegedly did almost all of the talking, and Dorsey said perhaps 50 words in the entire year to him. “A couple dozen text messages” rounded out their electronic communication, the complaint alleges.

Faced with such inertia, Zatko asserts that he was unable to solve some of the most serious issues, according to the complaint.

Some 30 percent of company laptops blocked automatic software updates carrying security fixes, and thousands of laptops had complete copies of Twitter’s source code, making them a rich target for hackers, it alleges.

A successful hacker takeover of one of those machines would have been able to sabotage the product with relative ease, because the engineers pushed out changes without being forced to test them first in a simulated environment, current and former employees said.

“It’s near-incredible that for something of that scale there would not be a development test environment separate from production and there would not be a more controlled source-code management process,” said Tony Sager, former chief operating officer at the cyberdefense wing of the National Security Agency, the Information Assurance divisio

Sager is currently senior vice president at the nonprofit Center for Internet Security, where he leads a consensus effort to establish best security practices.

The complaint says that about half of Twitter’s roughly 7,000 full-time employees had wide access to the company’s internal software and that access was not closely monitored, giving them the ability to tap into sensitive data and alter how the service worked. Three current and former employees agreed that these were issues.

“A best practice is that you should only be authorized to see and access what you need to do your job, and nothing else,” said former U.S. chief information security officer Gregory Touhill. “If half the company has access to and can make configuration changes to the production environment, that exposes the company and its customers to significant risk.”

The complaint says Dorsey never encouraged anyone to mislead the board about the shortcomings, but that others deliberately left out bad news.

When Dorsey left in November 2021, a difficult situation worsened under Agrawal, who had been responsible for security decisions as chief technology officer before Zatko’s hiring, the complaint says.

An unnamed executive had prepared a presentation for the new CEO’s first full board meeting, according to the complaint. Zatko’s complaint calls the presentation deeply misleading.

The presentation showed that 92 percent of employee computers had security software installed — without mentioning that those installations determined that a third of the machines were insecure, according to the complaint.

Another graphic implied a downward trend in the number of people with overly broad access, based on the small subset of people who had access to the highest administrative powers, known internally as “God mode.” That number was in the hundreds. But the number of people with broad access to core systems, which Zatko had called out as a big problem after joining, had actually grown slightly and remained in the thousands.

The presentation included only a subset of serious intrusions or other security incidents, from a total Zatko estimated as one per week, and it said that the uncontrolled internal access to core systems was responsible for just 7 percent of incidents, when Zatko calculated the real proportion as 60 percent.

Zatko stopped the material from being presented at the Dec. 9, 2021 meeting, the complaint said. But over his continued objections, Agrawal let it go to the board’s smaller Risk Committee a week later.

Agrawal didn’t respond to requests for comment. In an email to employees after publication of this article, obtained by The Post, he said that privacy and security continues to be a top priority for the company, and he added that the narrative is “riddled with inconsistences” and “presented without important context.”

On Jan. 4, Zatko reported internally that the Risk Committee meeting might have been fraudulent, which triggered an Audit Committee investigation.

Agarwal fired him two weeks later. But Zatko complied with the company’s request to spell out his concerns in writing, even without access to his work email and documents, according to the complaint.

Since Zatko’s departure, Twitter has plunged further into chaos with Musk’s takeover, which the two parties agreed to in May. The stock price has fallen, many employees have quit, and Agrawal has dismissed executives and frozen big projects.

Zatko said he hoped that by bringing new scrutiny and accountability, he could improve the company from the outside.

“I still believe that this is a tremendous platform, and there is huge value and huge risk, and I hope that looking back at this, the world will be a better place, in part because of this.”

“The economic momentum has clearly petered out,” Ms. Chen said. “I don’t know what I want to save money for, but I just feel that having some money would make me feel more secure.”

When China did away with its “zero-Covid” restrictions in December, there was anticipation that the economy would rebound from pent-up demand. But confidence began to wane from a deepening real estate crisis and a steady stream of disappointing economic indicators. Consumer spending started to slow.From January to May, retail sales grew 9.3 percent from a year earlier. But growth slowed substantially starting in June and has not rebounded to previous levels.

Even when pockets of spending picked up from pandemic lows, they remained far from pre-Covid levels.

Some are incapable of hearing about the apocalyptic destruction in Gaza at this moment, which seems emotionally incompatible with the hell Israelis are experiencing now. Even hardcore leftwingers I know are fighting feelings of rage and revenge. Some will slide towards the right.

Netanyahu’s legacy is ruined for good. But it hardly matters; Hamas might have just pushed Israelis into a far darker place than Netanyahu himself ever dreamed of.

That requires a movement that takes innovation as seriously as it takes affordability.

what Bastani sees clearly is that the world we should want requires more than redistribution. It requires inventions and advances that render old problems obsolete and new possibilities manifold.

the authors urge conservatives to tackle costs directly. Too often, Republican proposals to cut government spending are just shell games that shift costs onto individuals. The conservative enthusiasm for moving Medicare beneficiaries onto (often more expensive!) private plans “risks being little more than an accounting trick — a purely nominal change in ‘who pays’ that would do little to address the underlying sources of cost growth.”

For now, though, it’s Democrats who are starting to take supply-side concerns seriously.

A problem of our era is there’s too little utopian thinking, but one worthy exception is Aaron Bastani’s “Fully Automated Luxury Communism,” a leftist tract that puts the technologies in development right now — artificial intelligence, renewable energy, asteroid mining, plant- and cell-based meats, and genetic editing — at the center of a postwork, postscarcity vision.

“What if everything could change?” he asks. “What if, more than simply meeting the great challenges of our time — from climate change to inequality and aging — we went far beyond them, putting today’s problems behind us like we did before with large predators and, for the most part, illness? What if, rather than having no sense of a different future, we decided history hadn’t actually begun?”

There are sharp limits on supply in all of these sectors because regulators make it hard to increase supply (zoning laws make it difficult to build housing), training and hiring workers is expensive (adding classrooms means adding teachers and teacher aides, and expanding health insurance requires more doctors and nurses) or both. “This can result in a vicious cycle in which subsidies for supply-constrained goods or services merely push up prices, necessitating greater subsidies, which then push up prices, ad infinitum,” they write.

Progressives have long known to look for problems on the demand side of the economy — to ask whether there are goods and services people need that they cannot afford. That will make today fairer, but to ensure tomorrow is radically better, we need to look for the choke points in the future we imagine, the places where the economy can’t or won’t supply the things we need. And then we need to fix them.

In a world where two-thirds of emissions now come from middle-income countries like China and India, the only way for humanity to both address climate change and poverty is to invent our way to clean energy that is plentiful and cheap and then spend enough to rapidly deploy it.

It is true that European countries free-ride off the high cost we pay for drugs, because it’s the U.S. market that drives innovation. But that doesn’t mean we’d be better off paying their prices, if that meant new drug development slowed. We don’t just want everyone to have health insurance in the future. We want them to be healthier, freed from diseases and pain that even the best health insurance today cannot cure or ease.

It’s ludicrous to say that the pharmaceutical system we have now is oriented toward innovation. It’s oriented toward profit; sometimes that intersects with innovation and sometimes it doesn’t.

We should combine price controls with new policies to encourage drug development. That could include everything from more funding of basic research to huge prizes for discovering drugs that treat particular conditions to more public funding for drug trials.

Years ago, Bernie Sanders had an interesting proposal for creating a system of pharmaceutical prizes in which companies could make millions or billions for inventing drugs that cured certain conditions, and those drugs would be immediately released without exclusive patent protections. Focusing on the need to make new drugs affordable while ignoring the need to make more of them exist is like trimming a garden you’ve stopped watering.

this is a lesson progressives are, increasingly, learning. This is clearest on climate. Much of the spending in the Biden agenda is dedicated to increasing the supply of renewable energy and advanced batteries while building the supply of carbon-neutral transportation options.

In a blog post, Jared Bernstein, a member of President Biden’s Council of Economic Advisers, and Ernie Tedeschi, a senior policy economist for the council, framed the Biden agenda as “an antidote for inflationary pressure” because much of it expands the long-term supply of the economy.

Climate change is the most pressing example

look closely and you can see something new and overdue emerging in American politics: supply-side progressivism.

Though Ms. Ocasio-Cortez struggled early on to articulate her views on the Middle East and has never visited the region, the 34-year-old congresswoman has come to embody that generational shift.

She uses terms like “apartheid” and “oppression,” loathed by Israel’s defenders, to describe the treatment of Palestinians. Last week, she called the American Israel Public Affairs Committee, the most powerful pro-Israel lobby and one of Mr. Torres’s top campaign donors, “racist and bigoted.”

“This is pursuing a proven and failed strategy,” Ms. Ocasio-Cortez said in a recent radio interview. “So why do it, why kill kids, why put people in danger, why perpetuate these cycles when we’ve done it so many times, and it’s never kept us safe?”

Ms. Ocasio-Cortez, who did not agree to an interview, met in Washington last month with the families of Jewish hostages kidnapped by Hamas. She has repeatedly condemned the group and supports a two-state solution shunned by some on the left. And at a time when many liberal Jews feel they are being abandoned by the left, she has warned about “disgusting and unacceptable” antisemitism in a post to 8.4 million Instagram followers, saying, “No movement of integrity should tolerate it.”

“You can see how hard Alexandria is trying to listen compassionately across the lines of this conflict,” said Brad Lander, the left-leaning New York City comptroller who is the highest-ranking Jewish city official. “I’m not saying anyone is doing it perfectly, but there is a difference between trying and not trying.”

Mr. Torres has reserved special vitriol for the Democratic Socialists of America, the small but influential leftist group that has pushed for boycotts of Israel and counts Ms. Ocasio-Cortez as a member. In an interview, he said that the D.S.A. was trying to infiltrate the Democratic Party “to impose the ideological litmus tests on Israel” and “cleanse” those who disagree with them. He said he was on a “publicly stated mission” to undermine it.

“I do worry that the next generation is increasingly indoctrinated with anti-Israel hate so virulent that it renders them indifferent to the coldblooded murder of Jews in Israel,”

His views are no surprise to those who watched Mr. Torres, a proud college dropout and defender of public housing, evolve from left-aligned political upstart to more traditional Democratic congressman

It was his first trip abroad, and Mr. Torres said witnessing both the fragility of the frontier and Tel Aviv’s openness to gay life left him with “profound empathy” for Israel and a commitment to a two-state solution.

“We should be very concerned,” Whittaker said. “We are outgunned in terms of lobbying power [from major tech companies] and in terms of the ability to put our weight on the decision-makers in Congress.”

“we shouldn’t just dismiss it” as a “toy.”

“I think that sentiment is dangerous, like just coming in and saying this is just a hype cycle,” she said. “They’re getting better at doing things like structured reasoning. We shouldn’t just dismiss that this is not going to be a danger.”

The executive branch is “concerned and they’re doing a lot regulatorily, but everyone admits the only real answer is legislative,” Schumer said of the administration.

A higher proportion of young people also believe that urgent action is required to deal with climate change.

nearly 90 per cent of the over-65s say they recycle as much as possible compared with only half of young people.

Retired Britons are also three times more likely than younger people to have installed energy-saving measure

The over-65s are also more likely to have reduced the number of flights they take, to take steps to save water, to repair items, to wash clothes at low temperatures and to choose a renewable energy tariff.

They are also more likely to turn the heating down and switch off lights in rooms they are not using.

young people have a long way to go to live up to their reputation as being concerned for the planet.

There are some areas where 18 to 24-year-olds are doing more than older people, however. Young people are more likely to walk or cycle than older people

and they are more likely to be vegetarian or vegan.

17 per cent of 18 to 24-year-olds do not eat any meat compared with only 8 per cent of the over-65s

cross the population as a whole, 12 per cent of people say they are vegan or vegetarian.

Half of people questioned said that dealing with the cost of living is a greater priority than making changes to lower their environmental impact.

So fear creates recessions in the long run — and if we continue to have rising fear, the probability of a European recession grows and the probability of a US recession grows. Geopolitics is playing a bigger role in everyone’s equations.”

Geopolitical risk is a major component in shaping all our lives. We are having rising fear throughout the world, and less hope. Rising fear creates a withdrawal from consumption or spending more.

“When the Russian invasion occurred in Ukraine, we said that the peace dividend is over,” Larry Fink, chief executive of investment giant BlackRock, told The Sunday Times. “Now, with the instability in the Middle East, we’re going to almost a whole new future.

Dimon noted that inflation had “levelled off a little bit” overall, but said: “It’s not clear to me that long-term forces are not inflationary … And that’s why I’m saying rates could possibly go up from here. That’s life in the fast lane.”

Higher borrowing costs have started to hit debt-fuelled sectors that boomed in the zero-rates era — such as commercial property, where $80 billion (£65 billion) of assets across the US are in some form of financial distress, according to MSCI, and private equity.

[the legendary investor] Warren Buffett says you see who’s swimming naked when the tide goes out. Not everyone is really ready for 6 or 7 per cent rates, but I wouldn’t rule them out.”

Fink pointed out that the transmission of rate rises into the US economy was less direct than in the UK

“I’m a fundamental believer that we’re going to have higher inflation for longer, and it’s going to require the [Fed] to raise rates higher — probably one or two more tightenings — and that will ultimately be the way we get into recession.”

Many senior figures on Wall Street worry about the US government’s ability to finance itself in the medium term. As in the UK, the market for government debt was underpinned by huge waves of quantitative easing (QE) after the financial crisis, as the Federal Reserve, in effect, bought assets including Treasuries to boost the economy. Following a revival of the programme during Covid, it came to an end in March last year.

The withdrawal of QE, combined with lacklustre appetite for Treasuries among US banks and international investors such as China, could force the government to pay higher prices at a time of near-record borrowing.

“It might be a 20km headwind right now, but next year it’s going to be 25km and it’s going to grow,” a top investor said of the decreasing international demand for US government debt.

US stock market floats and fundraisings, the heartbeat of capital markets, slumped to their lowest level since 1998 last year as the spike in interest rates punctured valuations of growth stocks in sectors such as tech and healthcare.

The cautious mood on Wall Street comes against a backdrop of surprisingly strong US growth. The economy expanded by an astonishing 4.9 per cent in the third quart

the Biden administration is shovelling stimulus into the system via big pieces of legislation promising to accelerate America’s adoption of renewables, rebuild its advanced semiconductor industry and increase its spending on roads, bridges and broadband.

We have huge stimulus,” said Fink. “People are not factoring in the Inflation Reduction Act, the Chips Act and the Infrastructure Act, which are about $970 billion of stimulus. Those are the largest stimuluses ever when there’s not a pandemic or a financial crisis ... And it’s at a time when you can have unions win a 25 per cent labour increase … These are very inflationary, whether it’s the fiscal stimulus or these wage increases.”

It all comes back to that word. Unexpectedly high growth, massive government stimulus and now two wars that threaten to spill out into broader crises — it all spells inflation. The flurry of hope in markets that Fed and the Bank of England have reached the top of their rate-raising cycles may yet prove premature

The first missile launched on Wednesday by North Korea appeared to have been an ICBM, South Korean defense officials said. But it flew only 224 miles, the officials said, indicating that North Korea did not want to launch the missile on a full ICBM trajectory over the Pacific while Mr. Biden was in the air on his way back to Washington after a visit to Seoul and Tokyo.

The second missile launched on Wednesday apparently failed because it “disintegrated” after reaching an altitude of 12 miles, the South Korean officials said. The third projectile was a short-range ballistic missile.

The missile launches on Wednesday were a strong signal that North Korea was embarking on a new cycle of tensions in the Korean Peninsula despite the country’s first reported outbreak of the coronavirus. It also constituted North Korea’s public reaction to Mr. Biden’s trip to the region, where he met with the leaders of South Korea and Japan and vowed to step up measures, including joint military exercises, to help deter the growing nuclear and missile threat from the North.

But like his conservative predecessors, he attached an important caveat: Such economic largess would be possible only “if North Korea genuinely embarks on a process to complete denuclearization.”

In the same speech, he seemed to take a page from the playbook of President Vladimir V. Putin of Russia when he warned that his nuclear arsenal was not just to deter foreign invasion, but also to be used “if any forces try to violate the fundamental interests of our state.”

“North Korea continues to improve, expand and diversify its conventional and nuclear missile capabilities, posing an increasing risk to the U.S. homeland and U.S. forces, allies, and partners in the region,” John Plumb, the U.S. assistant secretary of defense for space policy, told the Senate Armed Services Committee this month. “Most of North Korea’s ballistic missiles have an assessed capability to carry nuclear payloads.”

It’s not that we haven’t been here before. It’s that we arrived and never left. We are caught in a recurring cycle of acute identity crisis (Are we a divine creation or a cosmic accident?) with our sense of our own dignity locked in a war against scientific and technological progress.

The erosion of traditional authority, namely religion, and the transition away from small, intimate communities in favor of large, impersonal urban settings has been rattling us emotionally and psychologically since before Charles Darwin posited evolution over special creation.

it’s also true that the mental habits of conspiracy are probably as old as the human species, and may be rooted in certain evolutionary advantages (e.g., pattern-seeking, symbolic language, cooperative skills) that have betrayed us.

We laugh at flat earthism or the stipulation of lizard people just as many nineteenth-century Germans mocked spiritualism, theosophy, and World Ice Theory. But it bears remembering that these esoteric views formed a good part of the intellectual scaffolding on which an overarching antisemitic “Volk theory” grew and which helped lead the world into catastrophe.

The long-term lesson of conspiracy is that the convergence of social forces under extraordinary economic and social pressures can split the atom of esoteric theories and lead to critical chain reactions

It doesn’t take a lot of imagination to envision an unscrupulous politician in this country welding a majority out of conspiracists and a beleaguered suburban middle class by focusing public anger on an imaginary “other.”

Teachers, university professors, drag queens, and “pedophiles” come to mind as such a figure’s potential targets. It has happened before, and it can happen again.

Riding the waves of mutability has always been possible if the frame of mind in government and society is adequately supple and responsive. Reliance on ancient nostrums, and expectations that old solutions will remain good enough, are almost inevitably fatal.

Civilisations that become dependent on large, widespread and complex supply networks and reciprocal markets usually generate their own fragilities. If one part of such a network fails, the effects cascade in a series of chain reactions through all apparently powerful participants in the system

The end of the Bronze Age c.1200 BC, perhaps triggered by drought in Anatolia, may have precipitated one such domino collapse, as the Hittite empire, the Mycenaeans, the Mesopotamian states and Pharaonic Egypt all either fell apart or shrank to an unrecognisable impotence.

Volcanoes are the unexpected killers. Their spewing of ash into an atmosphere whose winds distribute it around the globe has repeatedly destroyed summers, devastated crops, induced famines and collapsed societies

In his hands, the triumph of the West, with the unconscionable horrors of the Atlantic slave trade at its heart, takes on the appearance of an alarming fusion of Faust and Midas. For centuries, Europeans felt they could do no wrong. They could use the world, its people and beauties. They could transform it as they wished, shifting its plants, animals and populations where they wanted, and there would be no consequences. Or at least, as in those two myths of the cult of ‘entitlement’ – a word Frankopan repeatedly uses of the transforming empires – the consequences were hidden from the perpetrators.

His story of destruction over the past two centuries is one of arrogant myopia which led in the 20th century to ‘a sequence of catastrophes unparalleled both in human history and in that of the natural world. The suffering of the past 100 years has been by far the greatest in recorded history in terms of its scale and its horror’.

The assumption that man must conquer nature was allied to the capital and industrialised capacity to bring it about. Humanity became its own climate. Its own actions created the world in which it lived

The value of this book is as an act of deep understanding, recognising not only scientifically but culturally and philosophically that we are epiphenomena – not dominators of the Earth but products of it

Bleakly and soberingly, Frankopan recognises from the long line of precedents that the prospects are for a world of war and suffering. The destructive changes are already ‘baked in’. Success does not breed success, he says, but more often than not ‘sows the seeds of ruin’.

he started receiving death threats. People said they wished he and his family had been killed by drug lords, told him that “sooner or later your punishment will arrive” and proposed that he be nailed into a coffin or run over by a cement roller.

Mr. Moreno, who grew up in Colombia, began working as a researcher in a computer science and robotics lab in Paris in 1983; the career that followed involved creating a start-up, meeting the Dalai Lama and being named a knight of the Légion d’Honneur. His work has won several awards and spanned many fields — automotive, medical, nuclear, military, even home goods.

Many of the recent threats have been directed at scientists studying Covid-19. In a survey of 321 such scientists who had given media interviews, the journal Nature found that 22 percent had received threats of physical or sexual violence and 15 percent had received death threats

Last year, an Austrian doctor who was a vocal supporter of vaccines and a repeated target of threats died by suicide.

increasingly, even professors and researchers without much of a public persona have faced intimidation from extremists and conspiracy theorists.

Around 2010, he started thinking about how technology could help create sustainable cities. Eventually, he refined his ideas about “human smart cities” and “living cities” into his 2016 proposal for 15-minute cities.

The idea owes much to its many predecessors: “neighborhood units” and “garden cities” in the early 1900s, the community-focused urban planning pioneered by the activist Jane Jacobs in the 1960s, even support for “new urbanism” and walkable cities in the 1990s. So-called low-traffic neighborhoods, or LTNs, have been set up in several British cities over the past few decades.

Critics of 15-minute cities have been outspoken, arguing that a concept developed in Europe may not translate well to highly segregated American cities. A Harvard economist wrote in a blog post for the London School of Economics and Political Science in 2021 that the concept was a “dead end” that would exacerbate “enormous inequalities in cities” by subdividing without connecting them.

Jordan Peterson, a Canadian psychologist with four million Twitter followers, suggested that 15-minute cities were “perhaps the worst imaginable perversion” of the idea of walkable neighborhoods. He linked to a post about the “Great Reset,” an economic recovery plan proposed by the World Economic Forum that has spawned hordes of rumors about a pandemic-fueled plot to destroy capitalism.

A member of Britain’s Parliament said that 15-minute cities were “an international socialist concept” that would “cost us our personal freedoms.” QAnon supporters said the derailment of a train carrying hazardous chemicals in Ohio was an intentional move meant to push rural residents into 15-minute cities.

“Conspiracy-mongers have built a complete story: climate denialism, Covid-19, anti-vax, 5G controlling the brains of citizens, and the 15-minute city for introducing a perimeter for day-to-day life,” Mr. Moreno said. “This storytelling is totally insane, totally irrational for us, but it makes sense for them.”

The multipronged conspiracy theory quickly became “turbocharged” after the Oxford protest, said Jennie King, head of climate research and policy at the Institute for Strategic Dialogue, a think tank that studies online platforms.

“You have this snowball effect of a policy, which in principle was only going to affect a small urban population, getting extrapolated and becoming this crucible where far-right groups, industry-sponsored lobbying groups, conspiracist movements, anti-lockdown groups and more saw an opportunity to insert their worldview into the mainstream and to piggyback on the news cycle,”

The vitriol currently directed at Mr. Moreno and researchers like him mirrors “the broader erosion of trust in experts and institutions,”

Modern conspiracy theorists and extremists turn the people they disagree with into scapegoats for a vast array of societal ills, blaming them personally for causing the high cost of living or various health crises and creating an “us-versus-them” environment, she said.

“I am not a politician, I am not a candidate for anything — as a researcher, my duty is to explore and deepen my ideas with scientific methodology,” he said. “It is totally unbelievable that we could receive a death threat just for working as scientists.”