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As long as life continues as it has — with people choosing smaller family sizes, as is now common in most of the world — then in the 22nd or 23rd century, our decline could be just as steep as our rise.

there is no consensus on exactly how quickly populations will fall after that. Over the past 100 years, the global population quadrupled, from two billion to eight billion.

What would happen as a consequence? Over the past 200 years, humanity’s population growth has gone hand in hand with profound advances in living standards and health: longer lives, healthier children, better education, shorter workweeks and many more improvements

In this short period, humanity has been large and growing. Economists who study growth and progress don’t think this is a coincidence. Innovations and discoveries are made by people. In a world with fewer people in it, the loss of so much human potential may threaten humanity’s continued path toward better lives.

It would be tempting to welcome depopulation as a boon to the environment. But the pace of depopulation will be too slow for our most pressing problems. It will not replace the need for urgent action on climate, land use, biodiversity, pollution and other environmental challenges

If the population hits around 10 billion people in the 2080s and then begins to decline, it might still exceed today’s eight billion after 2100

Population decline would come quickly, measured in generations, and yet arrive far too slowly to be more than a sideshow in the effort to save the planet. Work to decarbonize our economies and reform our land use and food systems must accelerate in this decade and the next, not start in the next century.

This isn’t a call to immediately remake our societies and economies in the service of birthrates. It’s a call to start conversations now, so that our response to low birthrates is a decision that is made with the best ideas from all of u

If we wait, the less inclusive, less compassionate, less calm elements within our society and many societies worldwide may someday call depopulation a crisis and exploit it to suit their agendas — of inequality, nationalism, exclusion or control

Births won’t automatically rebound just because it would be convenient for advancing living standards or sharing the burden of care work

We know that fertility rates can stay below replacement because they have. They’ve been below that level in Brazil and Chile for about 20 years; in Thailand for about 30 years; and in Canada, Germany and Japan for about 50.

In fact, in none of the countries where lifelong fertility rates have fallen well below two have they ever returned above it. Depopulation could continue, generation after generation, as long as people look around and decide that small families work best for them, some having no children, some having three or four and many having one or two.

Nor can humanity count on any one region or subgroup to buoy us all over the long run. Birthrates are falling in sub-Saharan Africa, the region with the current highest average rates, as education and economic opportunities continue to improve

The main reason that birthrates are low is simple: People today want smaller families than people did in the past. That’s true in different cultures and economies around the world. It’s what both women and men report in surveys.

Humanity is building a better, freer world with more opportunities for everyone, especially for women

That progress also means that, for many of us, the desire to build a family can clash with other important goals, including having a career, pursuing projects and maintaining relationships

In a world of sustained low birthrates and declining populations, there may be threats of backsliding on reproductive freedom — by limiting abortion rights, for example

Nobody yet knows what to do about global depopulation. But it wasn’t long ago that nobody knew what to do about climate change. These shared challenges have much in common,

As with climate change, our individual decisions on family size add up to an outcome that we all share.

Six decades from now is when the U.N. projects the size of the world population will peak. There won’t be any quick fixes: Even if it’s too early today to know exactly how to build an abundant future that offers good lives to a stable, large and flourishing future population, we should already be working toward that goal.

But these measures have costs. Schooling time is cut short, so students learn less. People do not travel to their jobs, so work is less productive. The heat kept some farmers inside and stunted harvests, so crop yields fell and global food prices increased. Social life is disrupted.

The geography of poor countries — many are close to the Equator — is not the only reason climate change is such a burden for them. Their poverty is another factor, leaving them with fewer resources to adapt.

“Climate change is one of the most profound inequities of the modern era,”

There is a paradox to the climate crisis. Because India never fully industrialized, it has not released as many greenhouse gases as the U.S., European nations and other rich countries. But because it has not industrialized, it also has fewer resources to adapt than the richer, polluting nations.

Fewer than 10 percent of Indians have air-conditioning at home.

The rush for clean energy technologies, like solar and wind power, is an effort to break that tension — to give countries a way to industrialize without the planet-warming pollution. With climate disasters already hitting much of the world, that effort is in a race against time to prevent more crises like India’s.

The plan includes production of a graphic propaganda video that would show staged explosions and would use corpses and actors depicting grieving mourners, according to the official, who was not authorized to comment and spoke on the condition of anonymity.The plan, which was revealed in declassified intelligence shared with Ukrainian officials and European allies in recent days, is the latest allegation by the U.S. and Britain that Russia is plotting to use a false pretext to go to war against Ukraine.

Meanwhile, Putin met with Argentinian President Alberto Fernandez in Moscow and then spoke by phone to Macron, who had a call Wednesday night with U.S. President Joe Biden. Macron then spoke with Zelenskyy.

He reiterated Turkey’s commitment to Ukraine’s territorial integrity and sovereignty.

The NATO chief said Russian forces in Belarus are likely to rise to 30,000, including special forces, supported by fighter jets and missiles.

French Foreign Minister Jean-Yves Le Drian confirmed Thursday that Paris is sending troop reinforcements to Romania under NATO command, as part of France’s commitment to the alliance and its member states in Eastern Europe.

He did not say how many French soldiers will be deployed. The announcement came a day after the U.S. said it was moving troops stationed in Germany to Romania.

Ukraine’s defense minister is urging calm, saying the likelihood of a Russian invasion was “low.”Oleksii Reznikov said the threat of attack has loomed over the country since 2014, the year Russia seized Crimea, but he added: “There are no grounds for panic, fear, flight or packing of bags.”The minister said there are about 115,000 Russian troops near Ukraine’s border, including those deployed to Belarus for war games, but he said no battle groups have been detected along Ukraine’s border with Belarus. He also reiterated earlier assurances that Kyiv doesn’t plan to attack rebel-held areas in the war-torn east of Ukraine or Crimea — something the Kremlin has accused Kyiv of plotting.

An ice hockey fan, Putin will also attend Friday’s opening ceremony of the Winter Olympics.His talks with Chinese President Xi Jinping on Friday will be their first face-to-face since 2019 and will help cement a strong personal relationship that has been a key factor behind a growing partnership between the two former Communist rivals.

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.

The western world kept a buzz going for twelve years, and that’s an accomplishment. It must also be said that the 1990s weren’t squandered, because even in the dark years they were fun. They weren’t complicated.

the 1990s make great nostalgia bait: simpler politics, plus great music, plus cool fashion cues. And maybe we can create another halcyon bubble again one day!

The generation that came of age in the 1990s, now well into middle age, have a lot of happy memories of a sort that may never be possible to have again. At the moment any possibility of collective joy seems about as realistic as a Miss America contestant trying to wish world peace into existence

n the 1990s we still had the future, a place that you could travel to, that would be cool when you got there, like Australia or the South Pole. Right now we merely have a future, and a murky one at that, and it’s probably more like Kenosha, Wisconsin than Sydney.

I remember doing a book tour and ending up on a local AM radio station’s podium at the grand opening of Mall of America in Bloomington, Minnesota on 11 August 1992. It was full of Americans in alpha consumption mode, eating ice cream, faces beaming, walking around in unselfconscious bliss. The local radio jock said to me, “You must think all of this is pretty silly”. He motioned towards the crowd and then to a rollercoaster directly beside us that came screeching at our heads every 95 seconds.

But I said, “No. In a century people are going to look back on right now as a sort of magic era, a charmed time of peace and prosperity and freedom from fear, as something that can never happen again, no matter how much they wish it would”.

A handful of financial institutions produced them when Rio de Janeiro hosted in 2016, using a mixture of macroeconomic indicators and performances at previous Olympics to forecast total medal hauls for each country.

Gracenote’s distinguishing feature is the ability to produce quantitative analysis for each event.

Gracenote still uses the old system to produce its public medal table, which also deals in absolute forecasts, rather than fractional ones. If a French athlete, say, is the most likely to win an event, France gets awarded one gold medal in the table, even though the true probability of the athlete winning gold is less than 100% and his chances of claiming silver and bronze are greater than 0%.

The best way to answer that question is to take every previous contest in the sport and analyse how past results correlate with future success.

Yet only two events on the winter Olympics programme, curling and ice hockey, involve head-to-head contests.

Those that compete in teams have their scores blended with their compatriots. And for those that participate in a number of events, such as Ms Dahlmeier, results in related disciplines affect multiple ratings. A strong performance in the biathlon sprint, a group race, would boost her ranking in the pursuit, a staggered race, for example.

the Elo rating system, which was developed for chess by Arpad Elo, a Hungarian physicist. The formula exchanges ranking points from the loser to the winner, with greater rewards for beating stronger opponents. The difference in ratings points between two rivals can be easily used to calculate the probability that one will beat the other.

The bans have benefited Norway most, as the country will likely gain of the five of the 12 foregone medals—enough to nudge it ahead of Germany into first place in terms of total medals won.

Mr Gleave notes that the favourite only wins about 30% of the time, a lower share than in any other winter sport. Ms Dahlmeier’s rating has dwindled a little, but not by enough to suggest that last year’s record breaker has become this year’s flop.

Gracenote’s research into age curves for each sport shows that the best biathletes can maintain their peak performance into their early 30s (see chart). Expect to see more event-by-event forecasting at future Olympics, too.

The Heated Debate Over How The Pyramids Were Built

Though they didn’t have the wheel as we think of it today, they might have made use of cylindrical tree trunks laid side to side along the ground. If they lifted their blocks onto those tree trunks, they could effectively roll them across the desert. This theory goes a long way toward explaining how the pyramids’ smaller limestone blocks might have made their way to Giza — but it’s hard to believe it would work for some of the truly massive stones featured in the tombs

Proponents of this theory also have to contend with the fact that there isn’t any evidence that the Egyptians actually did this, clever though it would have been: there are no depictions of stones — or anything else — being rolled this way in Egyptian art or writings. Then there’s the challenge of how to lift the stones into position on an increasingly tall pyramid.

No conclusive evidence has been found in favor of either of these ideas, but both remain intriguing possibilities.

Amid such mystery, two startling new revelations about how the pyramids were built have recently come to light. The first was the work of a Dutch team who took a second look at Egyptian art depicting laborers hauling massive stones on sledges through the desert.

Though today the pyramids sit in the middle of miles of dusty desert, they were once surrounded by the floodplains of the Nile River. Lehner hypothesizes that if you could look far beneath the city of Cairo, you would find ancient Egyptian waterways that channeled the Nile’s water to the site of the pyramids’ construction.

The icing on the cake is the work of Pierre Tallet, an archaeologist who in 2013 unearthed the papyrus journal of a man named Merer who appears to have been a low-level bureaucrat charged with transporting some of the materials to Giza.

He recorded his journey with several gigantic limestone blocks from Tura to Giza — and with his writings offered the most direct insight there’s ever been into how the pyramids were built, putting a piece of one of the world’s oldest puzzles into place.

Though the work was dangerous, it’s now thought that the men who built the tombs were most likely skilled laborers who volunteered their time in exchange for excellent rations. The 1999 excavation of what researchers sometimes call the “pyramid city” shed light on the lives of the builders who made their homes in nearby compounds.

The painting shown in Dr. López Prater’s class is in one of the earliest Islamic illustrated histories of the world, “A Compendium of Chronicles,” written during the 14th century by Rashid-al-Din (1247-1318).Shown regularly in art history classes, the painting shows a winged and crowned Angel Gabriel pointing at the Prophet Muhammad and delivering to him the first Quranic revelation. Muslims believe that the Quran comprises the words of Allah dictated to the Prophet Muhammad through the Angel Gabriel.

The image is “a masterpiece of Persian manuscript painting,” said Christiane Gruber, a professor of Islamic art at the University of Michigan. It is housed at the University of Edinburgh; similar paintings have been on display at places like the Metropolitan Museum of Art. And a sculpture of the prophet is at the Supreme Court.Dr. Gruber said that showing Islamic art and depictions of the Prophet Muhammad have become more common in academia, because of a push to “decolonize the canon” — that is, expand curriculum beyond a Western model.

Dr. Gruber, who wrote the essay in New Lines Magazine defending Dr. López Prater, said that studying Islamic art without the Compendium of Chronicles image “would be like not teaching Michaelangelo’s David.”

Yet, most Muslims believe that visual representations of Muhammad should not be viewed, even if the Quran does not explicitly prohibit them. The prohibition stems from the belief that an image of Muhammad could lead to worshiping the prophet rather than the god he served.

The administration, he said, “closed down conversation when they should have opened it up.”

Omid Safi, a professor of Asian and Middle Eastern Studies at Duke University, said he regularly shows images of the Prophet Muhammad in class and without Dr. López Prater’s opt-out mechanisms. He explains to his students that these images were works of devotion created by pious artists at the behest of devout rulers.“That’s the part I want my students to grapple with,” Dr. Safi said. “How does something that comes from the very middle of the tradition end up being received later on as something marginal or forbidden?”

Dr. López Prater, a self-described art nerd, said she knew about the potential for conflict on Oct. 6, when she began her online lecture with 30 or so students.She said she spent a few minutes explaining why she was showing the image, how different religions have depicted the divine and how standards change over time.“I do not want to present the art of Islam as something that is monolithic,” she said in an interview, adding that she had been shown the image as a graduate student. She also showed a second image, from the 16th century, which depicted Muhammad wearing a veil.

Four days after the class, Dr. López Prater was summoned to a video meeting with the dean of the college of liberal arts, Marcela Kostihova.

After the class ended, Ms. Wedatalla, a business major and president of the university’s Muslim Student Association, stuck around to voice her discomfort.Immediately afterward, Dr. López Prater sent an email to her department head, Allison Baker, about the encounter; she thought that Ms. Wedatalla might complain.Ms. Baker, the chair of the digital and studio art department, responded to the email four minutes later.“It sounded like you did everything right,” Ms. Baker said. “I believe in academic freedom so you have my support.”

As Dr. López Prater predicted, Ms. Wedatalla reached out to administrators. Dr. López Prater, with Ms. Baker’s help, wrote an apology, explaining that sometimes “diversity involves bringing contradicting, uncomfortable and coexisting truths into conversation with each other.”

Ms. Wedatalla declined an interview request, and did not explain why she had not raised concerns before the image was shown. But in an email statement, she said images of Prophet Muhammad should never be displayed, and that Dr. López Prater gave a trigger warning precisely because she knew such images were offensive to many Muslims. The lecture was so disturbing, she said, that she could no longer see herself in that course.

Dr. López Prater said that no one in class raised concerns, and there was no disrespectful commentary.

Dr. Kostihova compared showing the image to using a racial epithet for Black people, according to Dr. López Prater.“It was very clear to me that she had not talked to any art historians,” Dr. López Prater said.

A couple of weeks later, the university rescinded its offer to teach next semester.

Dr. López Prater said she was ready to move on. She had teaching jobs at other schools. But on Nov. 7, David Everett, the vice president for inclusive excellence, sent an email to all university employees, saying that certain actions taken in an online class were “undeniably inconsiderate, disrespectful and Islamophobic.”

Dr. López Prater, who had only begun teaching at Hamline in the fall, said she felt like a bucket of ice water had been dumped over her head, but the shock soon gave way to “blistering anger at being characterized in those terms by somebody who I have never even met or spoken with.” She reached out to Dr. Gruber, who ended up writing the essay and starting the petition.

At the Dec. 8 forum, which was attended by several dozen students, faculty and administrators, Ms. Wedatalla described, often through tears, how she felt seeing the image.“Who do I call at 8 a.m.,” she asked, when “you see someone disrespecting and offending your religion?”Other Muslim students on the panel, all Black women, also spoke tearfully about struggling to fit in at Hamline. Students of color in recent years had protested what they called racist incidents; the university, they said, paid lip service to diversity and did not support students with institutional resources.