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if I think that simply explaining the facts to the other side is going to change their mind, then I’m in for a rude awakening.

As a philosopher, I found to be somewhat more disturbing the idea that denialism isn’t even about critical thinking.

what the large variety of denialisms have in common is a very strong, overwhelming, ideological commitment that helps define the denialist identity in a core manner. This commitment can be religious, ethnical or political in nature, but in all cases it fundamentally shapes the personal identity of the people involved, thus generating a strong emotional attachment, as well as an equally strong emotional backlash against critics.

To begin with, of course, they think of themselves as “skeptics,” thus attempting to appropriate a word with a venerable philosophical pedigree and which is supposed to indicate a cautiously rational approach to a given problem. As David Hume put it, a wise person (i.e., a proper skeptic) will proportion her beliefs to the evidence. But there is nothing of the Humean attitude in people who are “skeptical” of evolution, climate change, vaccines, and so forth.

Denialists have even begun to appropriate the technical language of informal logic: when told that a majority of climate scientists agree that the planet is warming up, they are all too happy to yell “argument from authority!” When they are told that they should distrust statements coming from the oil industry and from “think tanks” in their pockets they retort “genetic fallacy!” And so on. Never mind that informal fallacies are such only against certain background information, and that it is eminently sensible and rational to trust certain authorities (at the least provisionally), as well as to be suspicious of large organizations with deep pockets and an obvious degree of self-interest.

What commonalities can we uncover across instances of denialism that may allow us to tackle the problem beyond facts and elementary logic?

the evidence from the literature is overwhelming that denialists have learned to use the vocabulary of critical thinking against their opponents.

Another important issue to understand is that denialists exploit the inherently tentative nature of scientific or historical findings to seek refuge for their doctrines.

. Scientists have been wrong before, and doubtlessly will be again in the future, many times. But the issue is rather one of where it is most rational to place your bets as a Bayesian updater: with the scientific community or with Faux News?

Science should be portrayed as a human story of failure and discovery, not as a body of barely comprehensible facts arrived at by epistemic priests.

Is there anything that can be done in this respect? I personally like the idea of teaching “science appreciation” classes in high school and college [2], as opposed to more traditional (usually rather boring, both as a student and as a teacher) science instruction

Denialists also exploit the media’s self imposed “balanced” approach to presenting facts, which leads to the false impression that there really are two approximately equal sides to every debate.

This is a rather recent phenomenon, and it is likely the result of a number of factors affecting the media industry. One, of course, is the onset of the 24-hr media cycle, with its pernicious reliance on punditry. Another is the increasing blurring of the once rather sharp line between reporting and editorializing.

The problem with the media is of course made far worse by the ongoing crisis in contemporary journalism, with newspapers, magazines and even television channels constantly facing an uncertain future of revenues,

he push back against denialism, in all its varied incarnations, is likely to be more successful if we shift the focus from persuading individual members of the public to making political and media elites accountable.

This is a major result coming out of Brendan’s research. He showed data set after data set demonstrating two fundamental things: first, large sections of the general public do not respond to the presentation of even highly compelling facts, indeed — as mentioned above — are actually more likely to entrench further into their positions.

Second, whenever one can put pressure on either politicians or the media, they do change their tune, becoming more reasonable and presenting things in a truly (as opposed to artificially) balanced way.

Third, and most crucially, there is plenty of evidence from political science studies that the public does quickly rally behind a unified political leadership. This, as much as it is hard to fathom now, has happened a number of times even in somewhat recent times

when leaders really do lead, the people follow. It’s just that of late the extreme partisan bickering in Washington has made the two major parties entirely incapable of working together on the common ground that they have demonstrably had in the past.

Another thing we can do about denialism: we should learn from the detailed study of successful cases and see what worked and how it can be applied to other instances

Yet another thing we can do: seek allies. In the case of evolution denial — for which I have the most first-hand experience — it has been increasingly obvious to me that it is utterly counterproductive for a strident atheist like Dawkins (or even a relatively good humored one like yours truly) to engage creationists directly. It is far more effective when we have clergy (Barry Lynn of Americans United for the Separation of Church and State [6] comes to mind) and religious scientists

Make no mistake about it: denialism in its various forms is a pernicious social phenomenon, with potentially catastrophic consequences for our society. It requires a rallying call for all serious public intellectuals, academic or not, who have the expertise and the stamina to join the fray to make this an even marginally better world for us all. It’s most definitely worth the fight.

When we withhold belief because the evidence does not live up to the standards of science, we are skeptical. When we refuse to believe something, even in the face of what most others would take to be compelling evidence, we are engaging in denial. In most cases, we do this because at some level it upsets us to think that the theory is true.

The throes of denial must feel a lot like skepticism. The rest of the world “just doesn’t get it.” We are the ones being rigorous. How can others be so gullible in believing that something is “true” before all of the facts are in? Yet a warning should occur when these stars align and we find ourselves feeling self-righteous about a belief that apparently means more to us than the preservation of good standards of evidence

how to tell a fact from an opinion? By the time we sit down to evaluate the evidence for a scientific theory, it is probably too late. If we take the easy path in our thinking, it eventually becomes a habit. If we lie to others, sooner or later we may believe the lie ourselves. The real battle comes in training ourselves to embrace the right attitudes about belief formation in the first place, and for this we need to do a little philosophy.

a telltale sign of denialism: that these alleged skeptics usually have different standards of evidence for those theories that they want to believe

Surely few would willingly embrace the title of “denialist.” It sounds so much more rigorous and fair-minded to maintain one’s “skepticism.” To hold that the facts are not yet settled. That there is so much more that we do not know. That the science isn’t certain.

The problem here, however, is that this is based not only on a grave misunderstanding of science (which in a sense is never settled), but also of what it means to be a skeptic.

Doubting the overwhelming consensus of scientists on an empirical question, for which one has only the spottiest ideologically-motivated “evidence,” is not skepticism, it is the height of gullibility. It is to claim that it is much more likely that there is a vast conspiracy among thousands of climate scientists than that they have instead all merely arrived at the same conclusion because that is where they were led by the evidence.

Couldn’t the scientists nonetheless be wrong? Yes, of course. The history of science has shown us that any scientific theory (even Newton’s theory of gravity) can be wrong

this does not mean that one is a good skeptic merely for disbelieving the well-corroborated conclusions of science. To reject a cascade of scientific evidence that shows that the global temperature is warming and that humans are almost certainly the cause of it, is not good reasoning, even if some long-shot hypothesis comes along in 50 years to show us why we were wrong.

In scientific reasoning, there is such a thing as warrant. Our beliefs must be justified. This means that we should believe what the evidence tells us, even while science insists that we must also try our best to show how any given theory might be wrong. Science will sometimes miss the mark, but its successful track record suggests that there is no superior competitor in discovering the facts about the empirical world

When we cynically pretend to withhold belief long past the point at which ample evidence should have convinced us that something is true, we have stumbled past skepticism and landed in the realm of willful ignorance. This is not the realm of science, but of ideological crackpots

Identify the claim being made

the most popular contrarian argument: “Earth’s climate has changed naturally in the past, so current climate change is natural.”

Construct the argument by identifying the premises leading to that conclusion.

Determine whether the argument is deductive, meaning that it starts out with a general statement and reaches a definitive conclusion.

the first premise is that Earth’s climate has changed in the past through natural processes, and the second premise is that the climate is currently changing.

Check the argument for validity; does the conclusion follow from the premises?

Identify hidden premises. By adding an extra premise to make an invalid argument valid, we can gain a deeper understanding of why the argument is flawed.

the hidden assumption is “if nature caused climate change in the past, it must always be the cause of climate change.”

Check to see if the argument relies on ambiguity.

Not all climate change is equal

Therefore, human activity is necessary to explain current climate change.

If the argument hasn’t yet been ruled out, determine the truth of its premises.

the argument that “if something was the cause in the past, it will be the cause in the future” is invalid if the effect has multiple plausible causes or mechanisms

many of our leaders have abandoned the postwar bargain in favor of what the scientist Michael Mann calls the “scientization of politics.”

We face many daunting challenges as a society, and they won’t all be solved with more science and math education. But what has been lost is an understanding that science’s open-ended, evidence-based processes — rather than just its results — are essential to meeting those challenges.

My professors’ generation could respond to silliness like creationism with head-scratching bemusement. My students cannot afford that luxury. Instead they must become fierce champions of science in the marketplace of ideas.

Content moderation comes to every content platform eventually, and platforms are starting to realize this faster than ever.

Nothing symbolizes this shift as neatly as Facebook’s decision in October (and Twitter’s shortly after) to start banning Holocaust denial. Almost exactly a year earlier, Zuckerberg had proudly tied himself to the First Amendment in a widely publicized “stand for free expression” at Georgetown University.

The evolution continues. Facebook announced earlier this month that it will join platforms such as YouTube and TikTok in removing, not merely labeling or down-ranking, false claims about COVID-19 vaccines.

the pandemic also showed that complete neutrality is impossible. Even though it’s not clear that removing content outright is the best way to correct misperceptions, Facebook and other platforms plainly want to signal that, at least in the current crisis, they don’t want to be seen as feeding people information that might kill them.

When internet platforms announce new policies, assessing whether they can and will enforce them consistently has always been difficult. In essence, the companies are grading their own work. But too often what can be gleaned from the outside suggests that they’re failing.

It tweaked its algorithm to boost authoritative sources in the news feed and turned off recommendations to join groups based around political or social issues. Facebook is reversing some of these steps now, but it cannot make people forget this toolbox exists in the future

As platforms grow more comfortable with their power, they are recognizing that they have options beyond taking posts down or leaving them up. In addition to warning labels, Facebook implemented other “break glass” measures to stem misinformation as the election approached.

Platforms don’t deserve praise for belatedly noticing dumpster fires that they helped create and affixing unobtrusive labels to them

Warning labels for misinformation might make some commentators feel a little better, but whether labels actually do much to contain the spread of false information is still unknown.

News reporting suggests that insiders at Facebook knew they could and should do more about misinformation, but higher-ups vetoed their ideas. YouTube barely acted to stem the flood of misinformation about election results on its platform.

Even before the pandemic, YouTube had begun adjusting its recommendation algorithm to reduce the spread of borderline and harmful content, and is introducing pop-up nudges to encourage user

And if 2020 finally made clear to platforms the need for greater content moderation, it also exposed the inevitable limits of content moderation.

Down-ranking, labeling, or deleting content on an internet platform does not address the social or political circumstances that caused it to be posted in the first place

even the most powerful platform will never be able to fully compensate for the failures of other governing institutions or be able to stop the leader of the free world from constructing an alternative reality when a whole media ecosystem is ready and willing to enable him. As Renée DiResta wrote in The Atlantic last month, “reducing the supply of misinformation doesn’t eliminate the demand.”

Even so, this year’s events showed that nothing is innate, inevitable, or immutable about platforms as they currently exist. The possibilities for what they might become—and what role they will play in society—are limited more by imagination than any fixed technological constraint, and the companies appear more willing to experiment than ever.

“Empirical data do not support the conclusion of a crisis of public trust in science,” Naomi Oreskes and Erik M. Conway, historians of science at Harvard and Caltech, write in their 2022 article “From Anti-Government to Anti-Science: Why Conservatives Have Turned Against Science.” But the data “do support the conclusion of a crisis of conservative trust in science.”

Between 2018 and 2021, the General Social Survey found that the spread between the percentage of Democrats and Republicans who said they have “a great deal of confidence in the scientific community” rose to 33 points (65-32) from 13 points (54-41).

“During the Covid-19 pandemic,” the authors write,medicine and public health more broadly became politicized, with the internet amplifying public figures and even physicians encouraging individuals not to trust the advice of public health experts and scientists. As such, the pandemic may have represented a turning point in trust, with a profession previously seen as trustworthy increasingly subject to doubt.

Consider in 2000, 46 percent of Democrats and, almost equivalently, 47 percent of Republicans expressed a great deal of confidence in scientists. In 2022, these respective percentages were 53 percent and 28 percent. In twenty years, a partisan chasm in trust (a 25-percentage point gap) emerged.

Matthew Dallek, a political historian at George Washington University, wrote

Distrust of science is arguably the greatest hindrance to societal action to stem numerous threats to the lives of Americans and people worldwide

Some people suffer from poor dental health in part because their parents distrusted fluoridation of drinking water. The national failure to invest until recently in combating climate change has raised the odds of pandemics, made diseases more rampant, destabilized entire regions, and spurred a growing crisis of migration and refugees that has helped popularize far-right nativism in many Western democracies.

Donald Trump’s MAGA movement, Dallek argued,turbocharged anti-science conspiracy theories and attitudes on the American right, vaulting them to an even more influential place in American politics. Bogus notions — vaccines may cause autism, hydroxychloroquine may cure Covid, climate change isn’t real — have become linchpins of MAGA-era conservatism.

People look to their political leaders to provide them with information (“cues” or “heuristics”) about how they ought to think about complex science-related issues.

The direction of the partisan response, Bardon wrote, is driven by “who the facts are favoring, and science currently favors bad news for the industrial status quo.

The roots of the divergence, however, go back at least 50 years with the creation of the Environmental Protection Agency and the Occupational Safety and Health Administration in 1970, along with the enactment that same year of the Clean Air Act and two years later of the Clean Water Act.

These pillars of the regulatory state were, and still are, deeply dependent on scientific research to set rules and guidelines. All would soon be seen as adversaries of the sections of the business community that are closely allied with the Republican Party

These agencies and laws fostered the emergence of what Gordon Gauchat, a professor of sociology at the University of Wisconsin at Milwaukee, calls “regulatory science.” This relatively new role thrust science into the center of political debates with the result that federal agencies like the E.P.A. and OSHA “are considered adversarial to corporate interests. Regulatory science directly connects to policy management and, therefore, has become entangled in policy debates that are unavoidably ideological.”

In their 2022 article, Oreskes and Conway, write that conservatives’ hostility to sciencetook strong hold during the Reagan administration, largely in response to scientific evidence of environmental crises that invited governmental response. Thus, science — particularly environmental and public health science — became the target of conservative anti-regulatory attitudes.

“in every sociodemographic group in this survey study among 443, 2f455 unique respondents aged 18 years or older residing in the U.S., trust in physicians and hospitals decreased substantially over the course of the pandemic, from 71.5 percent in April 2020 to 40.1 percent in January 2024.”

religious and political skepticism of science have become mutually constitutive and self-reinforcing.

and thus secular science, concentrate in the Democratic Party. The process of party-sorting along religious lines has helped turn an ideological divide over science into a partisan one.

As partisan elites have staked out increasingly clear positions on issues related to climate change, vaccine hesitancy, and other science-related policy issues, the public has polarized in response.

Oreskes and Conway argue that the strength of the anti-science movement was driven by the alliance in the Reagan years between corporate interests and the ascendant religious right, which became an arm of the Republican Party as it supported creationism

This creates a feedback cycle, whereby — once public opinion polarizes about science-related issues — political elites have an electoral incentive to appeal to that polarization, both in the anti-science rhetoric they espouse and in expressing opposition to evidence-based policies.

In a demographically representative survey of 1,959 U.S. adults, I tracked how intentions to receive preventative cancer vaccines (currently undergoing clinical trials) vary by partisan identity. I find that cancer vaccines are already politically polarizing, such that Republicans are less likely than Democrats to intend to vaccinate.

Another key factor driving a wedge between the two parties over the trustworthiness of science is the striking partisan difference over risk tolerance and risk aversion.

Their conclusion: “We find, on average, that women are more risk averse than men.”

white males were more sympathetic with hierarchical, individualistic, and anti-egalitarian views, more trusting of technology managers, less trusting of government, and less sensitive to potential stigmatization of communities from hazards

The group with the consistently lowest risk perceptions across a range of hazards was white males.

Furthermore, we found sizable differences between white males and other groups in sociopolitical attitudes.

When asked whether “electrons are smaller than atoms” and “what gas makes up most of the earth’s atmosphere: hydrogen, nitrogen, carbon dioxide or oxygen,” almost identical shares of religious and nonreligious men and women who scored high on measures of scientific knowledge gave correct answers to the questions.

These positions suggest greater confidence in experts and less confidence in public-dominated social processes.

In other words, white men — the dominant constituency of the Republican Party, in what is known in the academic literature as “the white male effect” — are relatively risk tolerant and thus more resistant (or less committed) to science-based efforts to reduce the likelihood of harm to people or to the environment

major Democratic constituencies are more risk averse and supportive of harm-reducing policies.

Insofar as people tend to accept scientific findings that align with their political beliefs and disregard those that contradict them, political views carry more weight than knowledge of science.

comparing the answers to scientific questions among religious and nonreligious respondents revealed significant insight into differing views of what is true and what is not.

Our survey revealed that men rate a wide range of hazards as lower in risk than do women. Our survey also revealed that whites rate risks lower than do nonwhites

However, when asked “human beings, as we know them today, developed from earlier species of animals, true or false,” the religious students high in scientific literacy scored far below their nonreligious counterparts.

the evolution question did not measure scientific knowledge but instead was a gauge of “something else: a form of cultural identity.”

Kahan then cites a survey that asked “how much risk do you believe climate change poses to human health, safety or prosperity?” The survey demonstrated a striking correlation between political identity and the level of perceived risk: Strong Democrats saw severe risk potential; strong Republicans close to none.

the different responses offered by religious and nonreligious respondents to the evolution question were similar to the climate change responses in that they were determined by “cultural identity” — in this case, political identity.

Indeed, the inference can be made even stronger by substituting for, or fortifying political outlooks with, even more discerning cultural identity indicators, such as cultural worldviews and their interaction with demographic characteristics such as race and gender. In sum, whether people “believe in” climate change, like whether they “believe in” evolution, expresses who they are.

2023 PNAS paper, “Prosocial Motives Underlie Scientific Censorship by Scientists,” Cory J. Clark, Steven Pinker, David Buss, Philip Tetlock, David Geary and 34 others make the case that the scientific community at times censors itself

“Our analysis suggests that scientific censorship is often driven by scientists, who are primarily motivated by self-protection, benevolence toward peer scholars, and prosocial concerns for the well-being of human social groups.”

Clark and her co-authors argue that

Prosocial motives for censorship may explain four observations: 1) widespread public availability of scholarship coupled with expanding definitions of harm has coincided with growing academic censorship; 2) women, who are more harm-averse and more protective of the vulnerable than men, are more censorious; 3) although progressives are often less censorious than conservatives, egalitarian progressives are more censorious of information perceived to threaten historically marginalized groups; and 4) academics in the social sciences and humanities (disciplines especially relevant to humans and social policy) are more censorious and more censored than those in STEM.

The explicit politicization of academic institutions, including science journals, academic professional societies, universities, and university departments, is likely one causal factor that explains reduced trust in science.

Dietram A. Scheufele, who is a professor in science communication at the University of Wisconsin, was sharply critical of what he calls the scientific community’s “self-inflicted wounds”:

One is the sometimes gratuitous tendency among scientists to mock groups in society whose values we see as misaligned with our own. This has included prominent climate scientists tweeting that no Republicans are safe to have in Congress, popularizers like Neil deGrasse Tyson trolling Christians on Twitter on Christmas Day.

Scheufele warned againstDemocrats’ tendency to align science with other (probably very worthwhile) social causes, including the various yard signs that equate science to B.L.M., gender equality, immigration, etc. The tricky part is that most of these causes are seen as Democratic-leaning policy issues

Science is not that. It’s society’s best way of creating and curating knowledge, regardless of what that science will mean for politics, belief systems, or personal preferences.

For many on the left, Scheufele wrote,Science has become a signaling device for liberals to distinguish themselves from what they see as “anti-science” Republicans. That spells trouble

Science relies on the public perception that it creates knowledge objectively and in a politically neutral way. The moment we lose that aspect of trust, we just become one of the many institutions, including Congress, that have suffered from rapidly eroding levels of public trust.

Secondly, we can turn to neuroscience. Until recently we haven’t been able to look under the skull and see what the brain does when a problem is highly complex. The good news? The brain has a secret weapon against complexity, a process neuroscientists are now calling “insight.” We are learning more everyday about insight’s ability to catch the brain up to complexity—the real antidote to reverting to beliefs as a default.

When we talk about the reef dying, what we are talking about are the corals that form the reef’s structure – the things that when in a good state of health can be splendorous enough to support about 69,000 jobs in Queensland and add about $6bn to Australia’s economy every year.

The Great Barrier Reef has suffered mass coral bleaching three times – in 1998, 2002 and 2016 – with a fourth episode now unfolding. The cause is increasing ocean temperatures.

So it seems we are now at a stage where absolutely nothing is real unless you have seen it for yourself,

Senator Pauline Hanson and her One Nation climate science-denying colleagues tried to pull a similar stunt last year by taking a dive on a part of the reef that had escaped bleaching and then claiming this as proof that everything was OK everywhere else.

Corals bleach when they are exposed to abnormally high ocean temperatures for too long. Under stress, the corals expel the algae that give them their colour and more of their nutrients.

After the 2016 bleaching, a quarter of all corals on the reef, mostly located in the once “pristine” northern section, died before there was a chance for recovery.

Essentially, the study found the only measure that would give corals on the reef a fighting chance was to rapidly reduce greenhouse gas emissions.

Some commentators have suggested a key cause of the 2016 bleaching was the El Niño weather pattern that tends to deliver warmer global temperatures. But Hughes says that before 1998, the Great Barrier Reef went through countless El Niños without suffering the extensive mass bleaching episodes that are being seen, photographed, filmed and documented now.

Her core discovery, made with a co-author, Erik M. Conway, was twofold. They reported that dubious tactics had been used over decades to cast doubt on scientific findings relating to subjects like acid rain, the ozone shield, tobacco smoke and climate change. And most surprisingly, in each case, the tactics were employed by the same group of people.

The central players were serious scientists who had major career triumphs during the Cold War, but in subsequent years apparently came to equate environmentalism with socialism, and government regulation with tyranny.

In a 2010 book, Dr. Oreskes and Dr. Conway called these men “Merchants of Doubt,” and this spring the book became a documentary film, by Robert Kenner. At the heart of both works is a description of methods that were honed by the tobacco industry in the 1960s and have since been employed to cast doubt on just about any science being cited to support new government regulations.

Dr. Oreskes, the more visible and vocal of the “Merchants” authors, has been threatened with lawsuits and vilified on conservative websites, and routinely gets hate mail calling her a communist or worse.

She established her career as a historian with a book-length study examining the role of dissent in the scientific method. As she put it a few months ago to an audience at Indiana University, she wanted to wrestle with this question: “How do you distinguish a maverick from a crank?”

Dr. Oreskes found that Wegener had been treated badly, particularly by American geologists. But he did not abandon his faith in the scientific method. He kept publishing until his death in 1930, trying to convince fellow scientists of his position, and was finally vindicated three decades later by oceanographic research conducted during the Cold War.

As she completed that study, Dr. Oreskes sought to understand how science was affected not only by the Cold War but by its end. In particular, she started wondering about climate science. Global warming had seemed to rise as an important issue around the time the Iron Curtain came down. Was this just a way for scientists to scare up research money that would no longer be coming their way through military channels?

the widespread public impression was that scientists were still divided over whether humans were primarily responsible for the warming of the planet. But how sharp was the split, she wondered?

She decided to do something no climate scientist had thought to do: count the published scientific papers. Pulling 928 of them, she was startled to find that not one dissented from the basic findings that warming was underway and human activity was the main reason.

She published that finding in a short paper in the journal Science in 2004, and the reaction was electric. Advocates of climate action seized on it as proof of a level of scientific consensus that most of them had not fully perceived. Just as suddenly, Dr. Oreskes found herself under political attack.

Some of the voices criticizing her — scientists like Dr. Singer and groups like the George C. Marshall Institute in Washington — were barely known to her at the time, Dr. Oreskes said in an interview. Just who were they?

It did not take them long to document that this group, which included prominent Cold War scientists, had been attacking environmental research for decades, challenging the science of the ozone layer and acid rain, even the finding that breathing secondhand tobacco smoke was harmful. Trying to undermine climate science was simply the latest project.

Dr. Oreskes and Dr. Conway came to believe that the attacks were patterned on the strategy employed by the tobacco industry when evidence of health risks first emerged. Documents pried loose by lawyers showed that the industry had paid certain scientists to contrive dubious research, had intimidated reputable scientists, and had cherry-picked evidence to present a misleading pictur

The tobacco industry had used these tactics in defense of profits. But Dr. Oreskes and Dr. Conway wrote that the so-called merchants of doubt had adopted them for a deep ideological reason: contempt for government regulation. The insight gave climate scientists a new way of understanding the politics that had engulfed their field.

Following Dr. Oreskes’s cue, researchers have in recent years developed a cottage industry of counting scientific papers and polling scientists. The results typically show that about 97 percent of working climate scientists accept that global warming is happening, that humans are largely responsible, and that the situation poses long-term risks, though the severity of those risks is not entirely clear. That wave of evidence has prompted many national news organizations to stop portraying the field as split evenly between scientists who are convinced and unconvinced.

Dr. Oreskes’s critics have taken delight in searching out errors in her books and other writings, prompting her to post several corrections. They have generally been minor, though, like describing a pH of six as neutral, when the correct number is seven. Dr. Oreskes described that as a typographical error.

In the leaked emails, Dr. Singer told a group of his fellow climate change denialists that he felt that Dr. Oreskes and Dr. Conway had libeled him. But in an interview, when pressed for specific errors in the book that might constitute libel, he listed none. Nor did he provide such a list in response to a follow-up email request.

However much she might be hated by climate change denialists, Dr. Oreskes is often welcomed on college campuses these days. She usually outlines the decades of research supporting the idea that human emissions pose serious risks.

“One of the things that should always be asked about scientific evidence is, how old is it?” Dr. Oreskes said. “It’s like wine. If the science about climate change were only a few years old, I’d be a skeptic, too.”

Dr. Oreskes and Dr. Conway keep looking for ways to reach new audiences. Last year, they published a short work of science fiction, written as a historical essay from the distant future. “The Collapse of Western Civilization: A View From the Future” argues that conservatives, by fighting sensible action to cope with the climate crisis, are essentially guaranteeing the long-term outcome they fear, a huge expansion of government.

It summarized and condemned the scientific and medical fraud that the British researcher Andrew Wakefield perpetrated. Years earlier, he had falsely linked the measles, mumps, and rubella (MMR) vaccine to autism. The editorial lamented that “the damage to public health continues, fuelled by unbalanced media reporting and an ineffective response from government, researchers, journals, and the medical profession.”

Reporters also seek to ensure that viewers, listeners, or readers understand that measles can afflict a victim more powerfully than does a mere passing ailment.

Measles doesn’t spread in most U.S. communities because people are protected by “herd immunity,” meaning that 92% to 94% of the population is vaccinated or immune. That level of protection makes it hard for one case of measles to spread even from one unvaccinated person to another without direct contact.

a study that “found that only 51 percent of Americans were confident that vaccines are safe and effective, which is similar to the proportion who believe that houses can be haunted by ghosts.”

In some parts of California, resistance to vaccinations including the MMR shot is stronger than ever, despite cases of measles hitting five US states.

“Vaccines are a great idea, but they are poisoning us, adding things that kick in later in life so they can sell us more drugs.”

Health professionals say those claims are unfounded or vastly overstated.

Large outbreaks in the U.S. of the highly infectious disease have become more common in the past two years, even though measles hasn’t been indigenous since 2000, according to the Centers for Disease Control and Prevention.

the outbreak “should worry and enrage the public.” It indicted the anti-vaxxers’ “ignorant and self-absorbed rejection of science” and declared, “Getting vaccinated is good for the health of the inoculated person and also part of one’s public responsibility to help protect the health of others.”

“It’s wrong,” the editors emphasized, “to allow public health to be threatened while everyone else waits for these science-denying parents to open their eyes.”

“It’s because these people are highly educated and they get on the Internet and read things and think they can figure things out better than their physician.”

linked vaccination opposition to the “political left, which has long been suspicious of the lobbying power of the pharmaceutical industry and its influence on government regulators, and also the fringe political right, which has at different times seen vaccination, fluoridisation and other public-health initiatives as attempts by big government to impose tyrannical limits on personal freedom.”

Attempts to increase concerns about communicable diseases or correct false claims about vaccines may be especially likely to be counterproductive.

“attempting balance by giving vaccine skeptics and pro-vaccine advocates equal weight in news stories leads people to believe the evidence for and against vaccination is equally strong.”

A recent edition of the Washington Post carried a letter defending anti-vaxxers as “people who generally are pro-science and highly educated, who have high incomes and who have studied this issue carefully before coming to the conclusion that the risk to their children is greater than the slim possibility of contracting a childhood disease that [in many cases leaves] little or no residual consequences.”

anecdotal evidence suggests that some journalists, rather than omitting anti-vaxxers’ views, prefer to expose them and then oppose them.

“unwarranted fear . . . an assault on one of the greatest public-health inventions in world history.”

Tyson praises science as an “exercise in finding what is true” that’s based on peer-reviewed experimentation backed by other experiments and counter-experiments that gives birth to an “emergent truth.” He points out that science is “not something to toy with.” “You can’t say, ‘I chose not to believe in E=mc2,’” he says, referring to physicist Albert Einstein’s corroborated theory of special relativity. “You don’t have that option. It is true, whether or not you believe in it.”

Tyson warns that every minute someone is in denial of a scientific truth delays the “political solution that should have been established years ago.”  “Recognize what science is, and allow to be what it can and should be: In the service of civilization,” he says. “It’s in our hands.”

This matters for social animals like us, whose safety and very survival ultimately depend on our ability to coexist. Views that have more to do with competing tribal biases than objective interpretations of the evidence create destructive and violent conflict. Denial of scientifically established ‘truth’ cause all sorts of serious direct harms. Consider a few examples; • The widespread faith-based rejection of evolution feeds intense polarization. • Continued fear of vaccines is allowing nearly eradicated diseases to return. • Those who deny the evidence of the safety of genetically modified food are also denying the immense potential benefits of that technology to millions. • Denying the powerful evidence for climate change puts us all in serious jeopardy should that evidence prove to be true.

To address these harms, we need to understand why we often have trouble agreeing on what is true (what some have labeled science denialism). Social science has taught us that human cognition is innately, and inescapably, a process of interpreting the hard data about our world – its sights and sound and smells and facts and ideas - through subjective affective filters that help us turn those facts into the judgments and choices and behaviors that help us survive. The brain’s imperative, after all, is not to reason. It’s job is survival, and subjective cognitive biases and instincts have developed to help us make sense of information in the pursuit of safety, not so that we might come to know ‘THE universal absolute truth

This subjective cognition is built-in, subconscious, beyond free will, and unavoidably leads to different interpretations of the same facts.

But here is a truth with which I hope we can all agree. Our subjective system of cognition can be dangerous.

It can produce perceptions that conflict with the evidence, what I call The Perception Gap, which can in turn produce profound harm

We need to recognize the greater threat that our subjective system of cognition can pose, and in the name of our own safety and the welfare of the society on which we depend, do our very best to rise above it or, when we can’t, account for this very real danger in the policies we adopt.

"Everyone engages in motivated reasoning, everyone screens out unwelcome evidence, no one is a fully rational actor. Sure. But when it comes to something with such enormous consequences to human welfare

I think it's fair to say we have an obligation to confront our own ideological priors. We have an obligation to challenge ourselves, to push ourselves, to be suspicious of conclusions that are too convenient, to be sure that we're getting it right.

I am optimistic about a favourable shift in the political wind. The youth climate movement has galvanised attention and re-centred the debate on intergenerational ethics. We are seeing a tipping point in public consciousness. That bodes well. There is still a viable way forward to avoid climate catastrophe.

You can see from the talking points of inactivists that they are really in retreat. Republican pollsters like Frank Luntz have advised clients in the fossil fuel industry and the politicians who carry water for them that you can’t get away with denying climate change any more.

Let’s dig into deniers’ tactics. One that you mention is deflection. What are the telltale signs?Any time you are told a problem is your fault because you are not behaving responsibly, there is a good chance that you are being deflected from systemic solutions and policies

Blaming the individual is a tried and trusted playbook that we have seen in the past with other industries. In the 1970s, Coca Cola and the beverage industry did this very effectively to convince us we don’t need regulations on waste disposal. Because of that we now have a global plastic crisis. The same tactics are evident in the gun lobby’s motto, “guns don’t kill people, people kill people”, which is classic deflection

look at BP, which gave us the world’s first individual carbon footprint calculator. Why did they do that? Because BP wanted us looking at our carbon footprint not theirs.

Of course lifestyle changes are necessary but they alone won’t get us where we need to be. They make us more healthy, save money and set a good example for others.

But we can’t allow the forces of inaction to convince us these actions alone are the solution and that we don’t need systemic changes

I don’t eat meat. We get power from renewable energy. I have a plug-in hybrid vehicle. I do those things and encourage others to do them. but i don’t think it is helpful to shame people people who are not as far along as you.

Instead, let’s help everybody to move in that direction. That is what policy and system change is about: creating incentives so even those who don’t think about their environmental footprint are still led in that direction.

Another new front in the new climate war is what you call “doomism”. What do you mean by that?Doom-mongering has overtaken denial as a threat and as a tactic. Inactivists know that if people believe there is nothing you can do, they are led down a path of disengagement

They unwittingly do the bidding of fossil fuel interests by giving up.What is so pernicious about this is that it seeks to weaponise environmental progressives who would otherwise be on the frontline demanding change. These are folk of good intentions and good will, but they become disillusioned or depressed and they fall into despair.

Many of the prominent doomist narratives – [Jonathan] Franzen, David Wallace-Wells, the Deep Adaptation movement – can be traced back to a false notion that an Arctic methane bomb will cause runaway warming and extinguish all life on earth within 10 years. This is completely wrong. There is no science to support that.

Good people fall victim to doomism. I do too sometimes. It can be enabling and empowering as long as you don’t get stuck there. It is up to others to help ensure that experience can be cathartic.

the entry of new participants. Bill Gates is perhaps the most prominent. His new book, How to Prevent a Climate Disaster, offers a systems analyst approach to the problem, a kind of operating system upgrade for the planet. What do you make of his take?I want to thank him for using his platform to raise awareness of the climate crisis

I disagree with him quite sharply on the prescription. His view is overly technocratic and premised on an underestimate of the role that renewable energy can play in decarbonising our civilisation

If you understate that potential, you are forced to make other risky choices, such as geoengineering and carbon capture and sequestration. Investment in those unproven options would crowd out investment in better solutions.

Gates writes that he doesn’t know the political solution to climate change. But the politics are the problem buddy. If you don’t have a prescription of how to solve that, then you don’t have a solution and perhaps your solution might be taking us down the wrong path.

What are the prospects for political change with Joe Biden in the White House?Breathtaking. Biden has surprised even the most ardent climate hawks in the boldness of his first 100 day agenda, which goes well beyond any previous president, including Obama when it comes to use of executive actions. He has incorporated climate policy into every single government agency and we have seen massive investments in renewable energy infrastructure, cuts in subsidies for fossil fuels, and the cancellation of the Keystone XL pipeline.

On the international front, the appointment of John Kerry, who helped negotiate the Paris Accord, has telegraphed to the rest of the world that the US is back and ready to lead again

That is huge and puts pressure on intransigent state actors like [Australian prime minister] Scott Morrison, who has been a friend of the fossil fuel industry in Australia. Morrison has changed his rhetoric dramatically since Biden became president. I think that creates an opportunity like no other.

Have the prospects for that been helped or hindered by Covid?I see a perfect storm of climate opportunity. Terrible as the pandemic has been, this tragedy can also provide lessons, particularly on the importance of listening to the word of science when facing risks

Out of this crisis can come a collective reconsideration of our priorities. How to live sustainably on a finite planet with finite space, food and water. A year from now, memories and impacts of coronavirus will still feel painful, but the crisis itself will be in the rear-view mirror thanks to vaccines. What will loom larger will be the greater crisis we face – the climate crisis.

“For many of us, we’d literally rather not know because otherwise it creates such an acutely distressing experience for us as humans.”

this inability to engage presents itself as a complete denial of the climate crisis and climate science. But even among those who accept the dire predictions for the natural world, there are “micro-denials” that can block the ability to take action.

The social media platform has become a clearinghouse for misinformation concerning virtually every subject, including Holocaust denials and anti-Semitism in general.

“By allowing this hate propaganda on Facebook,” the group warned the company in a letter, “you are exposing the public and, in particular, youth to the anti-Semitism which fueled the Holocaust.”

The FBI has classified the group as a potential domestic terrorism threat.