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It’s dropping in developing countries, too. India surpassed China as the most populous country last year, yet its fertility is now below replacement.

“The demographic winter is coming,”

Smaller populations come with diminished global clout, raising questions in the U.S., China and Russia about their long-term standings as superpowers.

Some demographers think the world’s population could start shrinking within four decades—one of the few times it’s happened in history.

A year ago Japanese Prime Minister Fumio Kishida declared that the collapse of the country’s birthrate left it “standing on the verge of whether we can continue to function as a society.”

Had fertility stayed near 2.1, where it stood in 2007, the U.S. would have welcomed an estimated 10.6 million more babies since

In 2017, when the global fertility rate—a snapshot of how many babies a woman is expected to have over her lifetime—was 2.5, the United Nations thought it would slip to 2.4 in the late 2020s. Yet by 2021, the U.N. concluded, it was already down to 2.3—close to what demographers consider the global replacement rate of about 2.2

He has found that national birth registries are typically reporting births 10% to 20% below what the U.N. projected.

China reported 9 million births last year, 16% less than projected in the U.N.’s central scenario. In the U.S., 3.59 million babies were born last year, 4% less than the U.N. projected. In other countries, the undershoot is even larger: Egypt reported 17% fewer births last year. In 2022, Kenya reported 18% fewer.

In 2017 the U.N. projected world population, then 7.6 billion, would keep climbing to 11.2 billion in 2100. By 2022 it had lowered and brought forward the peak to 10.4 billion in the 2080s. That, too, is likely out of date

the University of Washington now thinks it will peak around 9.5 billion in 2061 then start declining. 

The falling birthrates come with huge implications for the way people live, how economies grow and the standings of the world’s superpowers.

In the U.S., a short-lived pandemic baby boomlet has reversed. The total fertility rate fell to 1.62 last year, according to provisional government figures, the lowest on record.

In 2017, when the fertility rate was 1.8, the Census Bureau projected it would converge over the long run to 2.0. It has since revised that down to 1.5. “It has snuck up on us,”

Historians refer to the decline in fertility that began in the 18th century in industrializing countries as the demographic transition. As lifespans lengthened and more children survived to adulthood, the impetus for bearing more children declined. As women became better educated and joined the workforce, they delayed marriage and childbirth, resulting in fewer children. 

Some demographers see this as part of a “second demographic transition,” a societywide reorientation toward individualism that puts less emphasis on marriage and parenthood, and makes fewer or no children more acceptable. 

In research published in 2021, the University of Maryland’s Kearney and two co-authors looked for possible explanations for the continued drop. They found that state-level differences in parental abortion notification laws, unemployment, Medicaid availability, housing costs, contraceptive usage, religiosity, child-care costs and student debt could explain almost none of the decline

“We suspect that this shift reflects broad societal changes that are hard to measure or quantify,” they conclude.

while raising children is no more expensive than before, parents’ preferences and perceived constraints have changed

“If people have a preference for spending time building a career, on leisure, relationships outside the home, that’s more likely to come in conflict with childbearing.” 

Once a low fertility cycle kicks in, it effectively resets a society’s norms and is thus hard to break, said Jackson. “The fewer children you see your colleagues and peers and neighbors having, it changes the whole social climate,”

Fertility is below replacement in India even though the country is still poor and many women don’t work—factors that usually sustain fertility.

Urbanization and the internet have given even women in traditional male-dominated villages a glimpse of societies where fewer children and a higher quality of life are the norm. “People are plugged into the global culture,

mothers and fathers, especially those that are highly educated, spend more time with their children than in the past. “The intensity of parenting is a constraint,”

Sub-Saharan Africa once appeared resistant to the global slide in fertility, but that too is changing. The share of all women of reproductive age using modern contraception grew from 17% in 2012 to 23% in 2022

Jose Rimon, a professor of public health at Johns Hopkins University, credits that to a push by national leaders in Africa which, he predicted, would drive fertility down faster than the U.N. projects. 

Mae Mariyam Thomas, 38, who lives in Mumbai and runs an audio production company, said she’s opted against having children because she never felt the tug of motherhood. She sees peers struggling to meet the right person, getting married later and, in some instances, divorcing before they have kids. At least three of her friends have frozen their eggs,

Danielle Vermeer grew up third in a family of four children on Chicago’s North Side, where her neighborhood was filled with Catholics of Italian, Irish and Polish descent and half her close friends had as many siblings as her or more.

Her Italian-American father was one of four children who produced 14 grandchildren. Now her parents have five grandchildren, including Vermeer’s two children, ages 4 and 7.

The 35-year-old, who is the co-founder of a fashion thrifting app, said that before setting out to have children, she consulted dozens of other couples and her Catholic church and read at least eight books on the subject, including one by Pope Paul VI. She and her husband settled on two as the right number.“The act of bringing a child into this world is an incredible responsibility,” she said.

Perhaps no country has been trying longer than Japan. After fertility fell to 1.5 in the early 1990s, the government rolled out a succession of plans that included parental leave and subsidized child care. Fertility kept falling.

In 2005, Kuniko Inoguchi was appointed the country’s first minister responsible for gender equality and birthrate. The main obstacle, she declared, was money: People couldn’t afford to get married or have children. Japan made hospital maternity care free and introduced a stipend paid upon birth of the child. 

Japan’s fertility rate climbed from 1.26 in 2005 to 1.45 in 2015. But then it started declining again, and in 2022 was back to 1.26.

This year, Prime Minister Fumio Kishida rolled out yet another program to increase births that extends monthly allowances to all children under 18 regardless of income, free college for families with three children, and fully paid parental leave.

noguchi, now a member of parliament’s upper house, said the constraint on would-be parents is no longer money, but time. She has pressed the government and businesses to adopt a four-day workweek

If you’re a government official or manager of a big corporation, you should not worry over questions of salary now, but that in 20 years time you will have no customers, no clients, no applicants to the Self-Defense Forces.”

Hungarian Prime Minister Viktor Orban has pushed one of Europe’s most ambitious natality agendas. Last year he expanded tax benefits for mothers so that women under the age of 30 who have a child are exempt from paying personal income tax for life. That’s on top of housing and child-care subsidies as well as generous maternity leaves. 

Hungary’s fertility rate, though still well below replacement, has risen since 2010. But the Vienna Institute of Demography attributed this primarily to women delaying childbirth because of a debt crisis that hit around 2010. Adjusted for that, fertility has risen only slightly, it concluded.

The usual prescription in advanced countries is more immigration, but that has two problems.

With no reversal in birthrates in sight, the attendant economic pressures are intensifying. Since the pandemic, labor shortages have become endemic throughout developed countries. That will only worsen in coming years as the postcrisis fall in birthrates yields an ever-shrinking inflow of young workers, placing more strain on healthcare and retirement systems.

worsening demographics could make this a second consecutive “lost decade” for global economic growth.

The Institute for Health Metrics and Evaluation found little evidence that pronatalist policies lead to sustained rebounds in fertility. A woman may get pregnant sooner to capture a baby bonus, researchers say, but likely won’t have more kids over the course of her lifetime.

As more countries confront stagnant population, immigration between them is a zero-sum gam

Historically, host countries have sought skilled migrants who enter through formal, legal channels, but recent inflows have been predominantly unskilled migrants often entering illegally and claiming asylum.

High levels of immigration have also historically aroused political resistance,

Many of the leaders keenest to raise birthrates are most resistant to immigratio

As birthrates fall, more regions and communities experience depopulation, with consequences ranging from closed schools to stagnant property values. Less selective colleges will soon struggle to fill classrooms because of the plunge in birthrates that began in 2007, said Fernández-Villaverde. Vance said rural hospitals can’t stay open because of the falling local population.

An economy with fewer children will struggle to finance pensions and healthcare for growing ranks of elderly. South Korea’s national pension fund, one of the world’s largest, is on track to be depleted by 2055

There’s been little public pressure to act, said Sok Chul Hong, an economist at Seoul National University. “The elderly are not very interested in pension reform, and the youth are apathetic towards politics,” he said. “It is truly an ironic situation.”

The dourness of the mood contrasted sharply with just a year ago, when many of the same participants — intelligence chiefs and diplomats, oligarchs and analysts — thought Russia might be on the verge of strategic defeat in Ukraine. There was talk of how many months it might take to drive the Russians back to the borders that existed before their invasion on Feb. 24, 2022. Now that optimism appeared premature at best, faintly delusional at worst.

Nikolai Denkov, the prime minister of Bulgaria, argued that Europeans should draw three lessons from the cascade of troubles. The war in Ukraine was not just about gray zones between Europe and Russia, he argued, but “whether the democratic world we value can be beaten, and this is now well understood in Europe.”

“European defense was a possibility before, but now it’s a necessity,” said Claudio Graziano, a retired general from Italy and former chairman of the European Union Military Committee. But saying the right words is not the same as doing what they demand.

third, they needed to separate Ukraine’s urgent needs for ammunition and air defense from longer-term strategic goals.

Some attendees found the commitments made by the leaders who showed up uninspiring, said Nathalie Tocci, director of Italy’s Institute of International Affairs. “Kamala Harris empty, Scholz mushy, Zelensky tired,

Second, European nations have realized that they must combine their forces in military, not just economic endeavors, to build up their own deterrence

“I feel underwhelmed and somewhat disappointed” by the debate here, said Steven E. Sokol, president of the American Council on Germany. “There was a lack of urgency and a lack of clarity about the path forward, and I did not see a strong show of European solidarity.

now two-thirds of the alliance members have met the goal of spending 2 percent of their gross domestic product on defense — up from just a handful of nations 10 years ago. But a few acknowledged that goal is now badly outdated, and they talked immediately about the political barriers to spending more.

the prospect of less American commitment to NATO, as the United States turned to other challenges from China or in the Middle East, was concentrating minds.

the fundamental disconnect was still on display: When Europeans thought Russia would integrate into European institutions, they stopped planning and spending for the possibility they might be wrong. And when Russia’s attitude changed, they underreacted.

“This is 30 years of underinvestment coming home,” said François Heisbourg, a French defense analyst, who called them “les trente paresseuses” — the 30 lazy years of post Cold-War peace dividends, in contrast to the 30 glorious years that followed World War II.

What was important for Europeans to remember was that this hot war in Ukraine was close and could spread quickly, Ms. Kallas said. “So if you think that you are far away, you’re not far away. It can go very, very fast.”

Dmytro Kuleba, the foreign minister of embattled Ukraine, was blunter. “I think our friends and partners were too late in waking up their own defense industries,” he said. “And we will pay with our lives throughout 2024 to give your defense industries time to ramp up production.”

Fresh estimates from the Congressional Budget Office this month said the U.S. labor force in 2023 had grown by 5.2 million people, thanks especially to net immigration

The sudden snapback in demand sent inflation soaring. Supply chain issues were a main reason prices rose quickly. But labor shortages posed a problem, too, and economists feared that rising wages — as employers scrambled to find workers — would keep price increases dangerously high.

he flow of migrants to the United States started slowing during the Trump administration, when officials took hundreds of executive actions designed to restrict migration.

Right before the pandemic, there were about 1.5 million fewer working-age immigrants in the United States than pre-2017 trends would have predicted, according to the San Francisco Fed. By the end of 2021, that shortfall had widened to about 2 million

But the economy overall wound up rebounding aggressively from the sudden, widespread closures of 2020, bolstered by historic government stimulus and vaccines that debuted faster than expected.

economy grow. But today’s snapshot still represents a stark turnaround from just a short time ago.

That’s because the labor force that emerged as the pandemic ebbed was smaller than it had been: Millions of people retired early, stayed home to take over child care or avoid getting sick, or decided to look for new jobs entirely

In the span of a year or so, employers went from having businesses crater to sprinting to hire enough staff to keep restaurants, hotels, retail stores and construction sites going. Wages for the lowest earners rose at the fastest pace.

About the same time, the path was widening for migrants to cross the southern border, particularly as the new Biden administration rolled back Trump-era restrictions.

Experts argue that the strength of the U.S. economy has benefited American workers and foreign-born workers alike. Each group accounts for roughly half of the labor market’s impressive year-over-year growth since January 2023

But the past few years were extremely abnormal because companies were desperate to hire.

lus, it would be exceedingly difficult for immigration to affect the wages of enormous swaths of the labor force,

“What it can do is lower the wages of a specific occupation in a specific area, but American workers aren’t stupid. They change jobs. They change what they specialize in,” Nowrasteh said. “So that’s part of the reason why wages don’t go down.”

In normal economic times, some analysts note, new immigrants can drag down wages, especially if employers decide to hire them over native-born workers. Undocumented workers, who don’t have as much leverage to push for higher pay, could lower average wages even more.

Particularly for immigrants fleeing poorer countries, the booming U.S. job market and the promise of higher wages continue to be an enormous draw.

“More than any immigration policy per se, the biggest pull for migrants is the strength of the labor market,” said Catalina Amuedo-Dorantes, an economics professor at the University of California at Merced. “More than any enforcement policy, any immigration policy, at the end of the day.”

Upon arriving in Denver in October, Santander hadn’t acquired a work permit but needed to feed his small children. Even without authorization, he found a job as a roofer for a contractor that ultimately pocketed his earnings, then one cleaning industrial refrigerators on the overnight shift for $12 an hour. Since receiving his work permit in January, Santander has started “a much better job” at a wood accessories manufacturer making $20 an hour.

But for the vast majority of migrants who arrive in the United States without prior approval, including asylum seekers and those who come for economic reasons, getting a work permit isn’t easy.

Federal law requires migrants to wait nearly six months to receive a work permit after filing for asylum. Wait times can stretch for additional months because of a backlog in cases.

While they wait, many migrants find off-the-books work as day laborers or street vendors, advocates say. Others get jobs using falsified documents, including many teenagers who came into the country as unaccompanied minors.

Still, many migrants miss the year-long window to apply for asylum — a process that can cost thousands of dollars — leaving them with few pathways to work authorization, advocates say. Those who can’t apply for asylum often end up working without official permission in low-wage industries where they are susceptible to exploitation.

Even when they arrive at college wanting something very different, an increasing number of students at elite universities seek the imprimatur of employment by a powerful firm and “making a bag” (slang for a sack of money) as quickly as possible.

Elite universities have always been major feeders into finance and consulting, and students have always wanted to make money. According to the annual American Freshman Survey, the biggest increase in students wanting to become “very well off financially” happened between the 1970s and 1980s, and it’s been creeping up since then.

According to a Harvard Crimson survey of Harvard Seniors, the share of 2024 graduates going into finance and consulting is 34 percent. (In 2022 and 2023 it exceeded 40 percent.

Another student, from Uruguay, who spent his second summer in a row practicing case studies in preparation for management consulting internship interviews, told me that everyone arrived on campus hoping to change the world. But what they learn at Harvard, he said, is that actually doing anything meaningful is too hard. People give up on their dreams, he told me, and decide they might as well make money. Someone else told me it was common at parties to hear their peers say they just want to sell out.

“There’s definitely a herd mentality,” Joshua Parker, a 21-year-old Harvard junior from Oahu, said. “If you’re not doing finance or tech, it can feel like you’re doing something wrong.”

As a freshman, he planned to major in environmental engineering. As a sophomore, he switched to economics, joining five of his six roommates. One of those roommates told me that he hoped to run a hedge fund by the time he was in his 30s. Before that, he wanted to earn a good salary, which he defined as $500,000 a year.

But in the last five years, faculty and administrators say, the pull of these industries has become supercharged. In an age of astronomical housing costs, high tuition and inequality, students and their parents increasingly see college as a means to a lucrative job, more than a place to explore.

These statistics approach the previous highs in 2007, after which the global financial crisis drove the share down to a recent low of 20 percent in 2009, from which it’s been regaining ground since

Fifteen years ago, fewer students went into tech. Adding in that sector, the share of graduates starting what some students non-disparagingly refer to as “sellout jobs” is more than half. (It was a record-shattering 60 percent in 2022 and nearly 54 percent in 2023.)

“When people say ‘selling out,’ I mean, obviously, there’s some implicit judgment there,” said Aden Barton, a 23-year-old Harvard senior who wrote an opinion column for the student newspaper headlined, “How Harvard Careerism Killed the Classroom.”

“But it really is just almost a descriptive term at this point for people pursuing certain career paths,” he continued. “I’m not trying to denigrate anybody’s career path nor my own.” (He interned at a hedge fund last summer.)

David Halek, director of employer relations at Yale’s Office of Career Strategy, thinks students may use the term “sell out” because of the perceived certainty: “It’s the easy path to follow. It is well defined,” he said.

“It’s hard to conceptualize other things,” said Andy Wang, a social studies concentrator at Harvard who recently graduated.

Some students talk about turning to a different career later on, after they’ve made enough money. “Nowadays, English concentrators often say they’re going into finance or management consulting for a couple of years before writing their novel,” said James Wood, a Harvard professor of the practice of literary criticism.

And a surprising number of students explain their desire for a corporate job by drawing on the ethos of effective altruism: Whether they are conscious of the movement or not, they believe they can have greater impact by maximizing earnings to donate to a cause than working for that cause.

Roger Woolsey, executive director of the career center at Union College, a private liberal arts college in Schenectady, N.Y, said he first noticed a change around 2015, with students who had been in high school during the Great Recession and who therefore prioritized financial security.

that might be why students and their parents were much more focused on professional outcomes than they used to be. “In the past few years,” she said, “I’ve seen a higher level of interest in this first-destination data” — stats on what jobs graduates are getting out of college.

“The students saw what their parents went through, and the parents saw what happened to themselves,” he said. “You couple that with college tuition continuing to rise,” he continued, and students started looking for monetary payoffs right after graduation.

“Twenty years ago, an ‘introduction to investment banking’ event was held at the undergraduate library at Harvard,” said Howard Gardner, a professor at the Harvard Graduate School of Education. “Forty students showed up, all men, and when asked to define ‘investment banking,’ none raised their hands.”

Now, according to Goldman Sachs, the bank had six times as many applicants this year for summer internships as it did 10 years ago, and was 20 percent more selective for this summer’s class than it was last year.

“Harvard is more diverse than ever before,” Mr. Contomanolis said, with nearly one in five students eligible for a low-income Pell Grant. Those students, he said, weigh whether to, for instance, “take a job back in my border town community in Texas and make a big impact in a kind of public service sense” or get a job with “a salary that would be life changing for my family.

according to The Harvard Crimson’s senior survey, as Mr. Barton noted in his opinion column, “The aggregate rate of ‘selling out’ is about the same — around 60 percent — for all income brackets.” The main distinction is that students from low-income families are comparatively more likely to go into technology than finance.

In other words, there is something additional at play, which Mr. Barton argues has to do with the nature of prestige. “If you tell me you’re working at Goldman Sachs or McKinsey, that’s amazing, their eyes are going to light up,” Mr. Barton said. “If you tell somebody, ‘Oh, I took this random nonprofit job,’ or even a journalism job, even if you’re going to a huge name, it’s going to be a little bit of a question mark.”

“Even if you don’t want to do it for the rest of your life, it’s seen kind of as the golden standard of a smart, hardworking person,”

Matine Khalighi, 22, founded a nonprofit to award scholarships to homeless youth when he was in eighth grade. When he began studying economics at Harvard, his nonprofit, EEqual, was granting 50 scholarships a year. But some of the corporations that funded EEqual were contributing to inequality that created homelessness, he said. Philanthropy wasn’t the solution for systemic change, he decided. Instead, he turned to finance, with the idea that the sector could marshal capital quickly for social impact.

Part of that has to do with recruitment; the most prestigious banks and consulting firms do so only at certain colleges, and they have intensified their presence on those campuses in recent years. Over the last five years or so, “the idea of thinking about your professional path has moved much earlier in the undergraduate experience,” Ms. Ciesil said. She said the banks first began talking to students earlier, and it was the entrance of Big Tech onto the scene, asking for junior summer applications by the end of sophomore year, that accelerated recruitment timelines.

The marker that really distinguishes Gen Z is how pessimistic its members are, and how much they feel like life is beyond their control, according to Jean Twenge, a psychologist who analyzed data from national surveys of high school students and first-year college students in her book “Generations.”

Money, of course, helps give people a sense of control. And because of income inequality, “there’s this idea that you either make it or you don’t, so you better make it,” Ms. Twenge said.

Mihir Desai, a professor at Harvard’s business and law schools, wrote a 2017 essay in The Crimson titled “The Trouble With Optionality,” arguing that students who habitually pursue the security of prestigious employment foreclose the risk-taking and longer-range thinking necessary for more unusual or idealistic achievements.

Mr. Desai believes that’s often because they are responding to the bigger picture, like threats to workers from artificial intelligence, and political and financial upheaval.

he’s observed two trends among students pursuing wealth. There’s “the option-buyer,” the student who takes a job in finance or consulting to buy more time or to keep options open. Then there’s what he calls “the lottery ticket buyer,” the students who go all-in on a risky venture, like a start-up or new technology, hoping to make a windfall.

In the last five years, Roosevelt Montás, a senior lecturer at Columbia University and the former director of its Center for the Core Curriculum, has noticed a new trend when he asks students in his American Political Thought classes to consider their future.

“Almost every discussion, someone will come in and say, ‘Well, I can go and make a lot of money and do more good with that money than I could by doing some kind of charitable or service profession,’” Mr. Montás said. “It’s there constantly — a way of justifying a career that is organized around making money.”

Mr. Desai said all of this logic goes, “‘Make the bag so you can do good in the world, make the bag so you can go into retirement, make the bag so you can then go do what you really want to do.’”

But this “really underestimates how important work is to people’s lives,” he said. “What it gets wrong is, you spend 15 years at the hedge fund, you’re going to be a different person. You don’t just go work and make a lot of money, you go work and you become a different person.”

AlphaGo’s victory demonstrated the unbridled potential of A.I. to achieve superhuman mastery of skills once considered too complicated for machines.

Mr. Lee, now 41, retired three years later, convinced that humans could no longer compete with computers at Go. Artificial intelligence, he said, had changed the very nature of a game that originated in China more than 2,500 years ago.

As society wrestles with what A.I. holds for humanity’s future, Mr. Lee is now urging others to avoid being caught unprepared, as he was, and to become familiar with the technology now. He delivers lectures about A.I., trying to give others the advance notice he wishes he had received before his match.

“I faced the issues of A.I. early, but it will happen for others,” Mr. Lee said recently at a community education fair in Seoul to a crowd of students and parents. “It may not be a happy ending.”

Mr. Lee is not a doomsayer. In his view, A.I. may replace some jobs, but it may create some, too. When considering A.I.’s grasp of Go, he said it was important to remember that humans both created the game and designed the A.I. system that mastered it.

What he worries about is that A.I. may change what humans value.

His immense talent was apparent from the start. He quickly became the best player of his age not only locally but across all of South Korea, Japan and China. He turned pro at 12.

“People used to be in awe of creativity, originality and innovation,” he said. “But since A.I. came, a lot of that has disappeared.”

By the time he was 20, Mr. Lee had reached 9-dan, the highest level of mastery in Go. Soon, he was among the best players in the world, described by some as the Roger Federer of the game.

Go posed a tantalizing challenge for A.I. researchers. The game is exponentially more complicated than chess, with it often being said that there are more possible positions on a Go board (10 with more than 100 zeros after it, by many mathematical estimates) than there are atoms in the universe.

The breakthrough came from DeepMind, which built AlphaGo using so-called neural networks: mathematical systems that can learn skills by analyzing enormous amounts of data. It started by feeding the network 30 million moves from high-level players. Then the program played game after game against itself until it learned which moves were successful and developed new strategies.

Mr. Lee said not having a true human opponent was disconcerting. AlphaGo played a style he had never seen, and it felt odd to not try to decipher what his opponent was thinking and feeling. The world watched in awe as AlphaGo pushed Mr. Lee into corners and made moves unthinkable to a human player.“I couldn’t get used to it,” he said. “I thought that A.I. would beat humans someday. I just didn’t think it was here yet.”

AlphaGo’s victory “was a watershed moment in the history of A.I.” said Demis Hassabis, DeepMind’s chief executive, in a written statement. It showed what computers that learn on their own from data “were really capable of,” he said.

Mr. Lee had a hard time accepting the defeat. What he regarded as an art form, an extension of a player’s own personality and style, was now cast aside for an algorithm’s ruthless efficiency.

His 17-year-old daughter is in her final year of high school. When they discuss what she should study at university, they often consider a future shaped by A.I.“We often talk about choosing a job that won’t be easily replaceable by A.I. or less impacted by A.I.,” he said. “It’s only a matter of time before A.I. is present everywhere.”

But the C.D.C. director, Dr. Mandy Cohen, called the disease endemic last week, and the agency decided earlier this year to retire its five-day Covid isolation guidelines and instead include Covid in its guidance for other respiratory infections, instructing people with symptoms of Covid, RSV or the flu to stay home for 24 hours after their fever lift

For vulnerable groups, the coronavirus will always present a heightened risk of serious infection and even death. Long Covid, a multifaceted syndrome, has afflicted at least 400 million people worldwide, researchers recently estimated, and most of those who have suffered from it have said they still have not recovered.

“But it certainly has a sort of social definition — a virus that’s around us all the time — and if you want to take that one, then we’re definitely there.”

In a Gallup poll this spring, about 59 percent of respondents said they believed the pandemic was “over” in the United States, and the proportion of people who said they felt concerned about catching Covid has been generally declining for two years. Among people who rated their own health positively, almost 9 in 10 said they were not worried about getting infected.

“But,” he said, “it is just as important to help people onto an off-ramp — to be clear when we are no longer tied to the train tracks, staring at the headlights barreling down.”

“We’ve decided, ‘Well, the risk is OK.’ But nobody has defined ‘risk,’ and nobody has defined ‘OK,’” Dr. Osterholm said. “You can’t get much more informed than this group.”

Dr. Hanage defended the hard-line mandates from the early years of the pandemic as “not just appropriate, but absolutely necessary.”

in Paris last month, the organizing committee for the 2024 Olympics offered no testing requirements or processes for reporting infections, and so few countries issued rules to their athletes that the ones that did made news.

There were high-fives, group hugs, throngs of crowds and plenty of transmission to show for it. At least 40 athletes tested positive for the virus, including several who earned medals in spite of it — as well as an unknowable number of spectators, since French health officials (who had once enforced an eight-month-long nightly Covid curfew) did not even count.

In the United States, about 57 percent of people said their lives had not returned to prepandemic “normal” — and the majority said they believed it never would. But the current backdrop of American life tells a different story.

the newfound complacency can as much be attributed to confusion as to fatigue. The virus remains remarkably unpredictable: Covid variants are still evolving much faster than influenza variants, and officials who want to “pigeonhole” Covid into having a well-defined seasonality will be unnerved to discover that the 10 surges in the United States so far have been evenly distributed throughout all four seasons, he said.

Those factors, combined with waning immunity, point to a virus that still evades our collective understanding — in the context of a collective psychology that is ready to move on. Even at a meeting of 200 infectious disease experts in Washington earlier this month — a number of whom were over 65 and had not been vaccinated in four to six months — hardly anybody donned a mask.

That could be, at least partly, a result of personal experience: About 70 percent of people said they had been through a Covid infection already, suggesting that they believed they had some immunity or at least that they could muscle through it again if need be.

Asked about how the perception of risk has evolved over time, Dr. Osterholm laughed.

“Lewis Carroll once said something like, ‘If you don’t know where you’re going, any road will take you there,’” he said. “I feel in many ways, that’s where we’re at.”Image

The Israeli military relies on reservist soldiers, some of whom have described growing exhaustion as Israel manages conflicts for months on end on multiple fronts, including the border with Lebanon and in the West Bank. An end to fighting in Gaza would give Israeli forces a respite that analysts say is needed, especially if fighting with Hezbollah escalates further.

Israel Ziv, a retired Israeli general and veteran of multiple wars, said tensions between the Israeli military and security establishment and Netanyahu are at a record high.“The IDF feels and the security echelon feels that we exhausted the purpose of the war. We reached the maximum tactical peak that we can achieve,” he said. “As long as Rafah was there, they could say finish the job. OK it’s finished now.”

Netanyahu has rejected a series of proposals for possible alternatives to Hamas, including an American plan to bring in the Palestinian Authority and Arab calls for a Palestinian unity government that would include Hamas. Some military analysts and former Israeli officials have questioned whether installing a new government in Gaza was ever possible, given that Hamas has managed to survive the Israeli military assault.

“We need to make a decision,” said Ziv. “Even a bad decision, that’s OK. Let’s say [we] occupy Gaza in the next few years because we need to clear up the last few terrorists. OK, it’s a bad decision, but it’s a decision. The military needs to know.”

The dispute between Netanyahu and the military centers in part on how officials define a defeat of Hamas. An Israeli military official said the army considers a battalion “dismantled” not when all its fighters are killed, but when its command structure and ability to carry out organized attacks are eliminated. 

Military analysts say that Hamas’s militia forces are likely to survive the Israeli military operation even in Rafah, in part because the Israeli army’s approach leaves many lower-ranking Hamas fighters in place. Hamas’s top leadership in the enclave, including its leader, Yahya Sinwar, have also eluded Israeli forces throughout the war.

“Hamas is preserving its forces in Rafah rather than engaging the Israel Defense Forces, likely because Hamas does not believe Israel’s Rafah operation will be decisive,” said an assessment this week from the Institute for the Study of War and the American Enterprise Institute’s Critical Threats Project.