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“So far we’re seeing basic agreement with our best model of the universe, but we’re also seeing some potentially interesting differences that could indicate that dark energy is evolving with time,”

When the scientists combined their map with other cosmological data, they were surprised to find that it did not quite agree with the otherwise reliable standard model of the universe, which assumes that dark energy is constant and unchanging. A varying dark energy fit the data points better.

“It’s certainly more than a curiosity,” Dr. Palanque-Delabrouille said. “I would call it a hint. Yeah, it’s not yet evidence, but it’s interesting.”

But this version of dark energy is merely the simplest one. “With DESI we now have achieved a precision that allows us to go beyond that simple model,” Dr. Palanque-Delabrouille said, “to see if the density of dark energy is constant over time, or if it has some fluctuations and evolution with time.”

“While combining data sets is tricky, and these are early results from DESI, the possible evidence that dark energy is not constant is the best news I have heard since cosmic acceleration was firmly established 20-plus years ago.”

praised the new survey as “superb data.” The results, she said, “open the potential for a new window into understanding dark energy, the dominant component of the universe, which remains the biggest mystery in cosmology. Pretty exciting.”

what if dark energy were not constant as the cosmological model assumed?

At issue is a parameter called w, which is a measure of the density, or vehemence, of the dark energy. In Einstein’s version of dark energy, this number remains constant, with a value of –1, throughout the life of the universe. Cosmologists have been using this value in their models for the past 25 years.

Dark energy took its place in the standard model of the universe known as L.C.D.M., composed of 70 percent dark energy (Lambda), 25 percent cold dark matter (an assortment of slow-moving exotic particles) and 5 percent atomic matter. So far that model has been bruised but not broken by the new James Webb Space Telescope

As a measure of distance, the researchers used bumps in the cosmic distribution of galaxies, known as baryon acoustic oscillations. These bumps were imprinted on the cosmos by sound waves in the hot plasma that filled the universe when it was just 380,000 years old. Back then, the bumps were a half-million light-years across. Now, 13.5 billion years later, the universe has expanded a thousandfold, and the bumps — which are now 500 million light-years across — serve as convenient cosmic measuring sticks.

The DESI scientists divided the past 11 billion years of cosmic history into seven spans of time. (The universe is 13.8 billion years old.) For each, they measured the size of these bumps and how fast the galaxies in them were speeding away from us and from each other.

When the researchers put it all together, they found that the usual assumption — a constant dark energy — didn’t work to describe the expansion of the universe. Galaxies in the three most recent epochs appeared closer than they should have been, suggesting that dark energy could be evolving with time.

Dr. Riess of Johns Hopkins, who had an early look at the DESI results, noted that the “hint,” if validated, could pull the rug out from other cosmological measurements, such as the age or size of the universe. “This result is very interesting and we should take it seriously,” he wrote in his email. “Otherwise why else do we do these experiments?”

Analyzing the relative sizes and frequencies of spots and ripples over the years has allowed astronomers to describe the birth of the universe to a precision that would make the philosophers weep. The new data have allowed astronomers to tweak their model a bit. It now seems the universe is 13.8 billion years old, instead of 13.7 billion, and consists by mass of 4.9 percent ordinary matter like atoms, 27 percent dark matter and 68 percent dark energy.

“Our ultimate goal would be to construct a new model that predicts the anomalies and links them together. But these are early days; so far, we don’t know whether this is possible and what type of new physics might be needed. And that’s exciting.”

The microwaves detected by the Planck date from 370,000 years after the Big Bang, which is as far back as optical or radio telescopes will ever be able to see, cosmologists say. But the patterns within them date from less than a trillionth of a second after the Big Bang, when the universe is said to have undergone a violent burst of expansion known as inflation that set cosmic history on the course it has followed ever since. Those patterns are Planck’s prize.

Within the standard cosmological framework, however, the new satellite data underscored the existence of puzzling anomalies that may yet lead theorists back to the drawing board. The universe appears to be slightly lumpier, with bigger and more hot and cold spots in the northern half of the sky as seen from Earth than toward the south, for example. And there is a large, unexplained cool spot in the northern hemisphere.

The biggest surprise here, astronomers said, is that the universe is expanding slightly more slowly than previous measurements had indicated. The Hubble constant, which characterizes the expansion rate, is 67 kilometers per second per megaparsec — in the units astronomers use — according to Planck. Recent ground-based measurements combined with the WMAP data gave a value of 69, offering enough of a discrepancy to make cosmologists rerun their computer simulations of cosmic history.

a Planck team member from the University of California, Berkeley, said it represents a mismatch between measurements made of the beginning of time and those made more recently, and that it could mean that dark energy, which is speeding up the expansion of the universe, is more complicated than cosmologists thought. He termed the possibility “pretty radical,” adding, “That would be pretty exciting.”

The data also offered striking support for the notion of inflation, which has been the backbone of Big Bang theorizing for 30 years. Under the influence of a mysterious force field during the first trillionth of a fraction of a second, what would become the observable universe ballooned by 100 trillion trillion times in size from a subatomic pinprick to a grapefruit in less than a violent eye-blink, so the story first enunciated by Alan Guth of M.I.T. goes.

Submicroscopic quantum fluctuations in this force field are what would produce the hot spots in the cosmic microwaves, which in turn would grow into galaxies. According to Planck’s measurements, those fluctuations so far fit the predictions of the simplest model of inflation, invented by Andrei Linde of Stanford, to a T. Dr. Tegmark of M.I.T. said, “We’re homing in on the simplest model.”

Cosmologists still do not know what might have caused inflation, but the recent discovery of the Higgs boson has provided evidence that the kinds of fields that can provoke such behavior really exist.

another clue to the nature of inflation could come from the anomalies in the microwave data — the lopsided bumpiness, for example — that tend to happen on the largest scales in the universe. By the logic of quantum cosmology, they were the first patterns to be laid down on the emerging cosmos; that is to say, when inflation was just starting.

Adding to the confusion, there already is a force field — called dark energy — making the universe expand faster. And a new, controversial report suggests that this dark energy might be getting stronger and denser, leading to a future in which atoms are ripped apart and time ends.

Or it could all be a mistake. Astronomers have rigorous methods to estimate the effects of statistical noise and other random errors on their results; not so for the unexamined biases called systematic errors.

“The unknown systematic is what gets you in the end.

As space expands, it carries galaxies away from each other like the raisins in a rising cake. The farther apart two galaxies are, the faster they will fly away from each other. The Hubble constant simply says by how much

But to calibrate the Hubble constant, astronomers depend on so-called standard candles: objects, such as supernova explosions and certain variable stars, whose distances can be estimated by luminosity or some other feature. This is where the arguing begins

in 2001, a team using the Hubble Space Telescope, and led by Dr. Freedman, reported a value of 72. For every megaparsec farther away from us that a galaxy is, it is moving 72 kilometers per second faster.

d astronomers now say they have narrowed the uncertainty in the Hubble constant to just 2.4 percent.

These results are so good that they now disagree with results from the European Planck spacecraft, which predict a Hubble constant of 67.

What if that baby picture left out or obscured some important feature of the universe

Rather, the Planck group derived the value of the constant, and other cosmic parameters, from a mathematical model largely based on those microwaves

In short, Planck’s Hubble constant is based on a cosmic baby picture. In contrast, the classical astronomical value is derived from what cosmologists modestly call “local measurements,” a few billion light-years deep into a middle-aged universe

Planck is considered the gold standard of cosmology. It spent four years studying the cosmic bath of microwaves left over from the end of the Big Bang, when the universe was just 380,000 years old. But it did not measure the Hubble constant directly

String theory suggests that space could be laced with exotic energy fields associated with lightweight particles or forces yet undiscovered. Those fields, collectively called quintessence, could act in opposition to gravity, and could change over time — popping up, decaying or altering their effect, switching from repulsive to attractive.

If dark energy remains constant, everything outside our galaxy eventually will be moving away from us faster than the speed of light, and will no longer be visible. The universe will become lifeless and utterly dark.But if dark energy is temporary — if one day it switches off — cosmologists and metaphysicians can all go back to contemplating a sensible tomorrow.

The jury is still out. Dr. Riess said that the idea seems to work, which is not to say that he agrees with it, or that it is right. Nature, manifest in future observations, will have the final say.

So far, the smart money is still on cosmic confusion. Michael Turner, a veteran cosmologist at the University of Chicago and the organizer of a recent airing of the Hubble tensions, said, “Indeed, all of this is going over all of our heads. We are confused and hoping that the confusion will lead to something good!”

Early dark energy appeals to some cosmologists because it hints at a link to, or between, two mysterious episodes in the history of the universe.

The first episode occurred when the universe was less than a trillionth of a trillionth of a second old. At that moment, cosmologists surmise, a violent ballooning propelled the Big Bang; in a fraction of a trillionth of a second, this event — named “inflation” by the cosmologist Alan Guth, of M.I.T. — smoothed and flattened the initial chaos into the more orderly universe observed today. Nobody knows what drove inflation.

The second episode is unfolding today: cosmic expansion is speeding up.

The issue came to light in 1998, when two competing teams of astronomers asked whether the collective gravity of the galaxies might be slowing the expansion enough to one day drag everything together into a Big Crunch

To great surprise, they discovered the opposite: the expansion was accelerating under the influence of an anti-gravitational force later called dark energy

Dark energy comprises 70 percent of the mass-energy of the universe. And, spookily, it behaves very much like a fudge factor known as the cosmological constant, a cosmic repulsive force that Einstein inserted in his equations a century ago thinking it would keep the universe from collapsing under its own weight.

Under the influence of dark energy, the cosmos is now doubling in size every 10 billion years — to what end, nobody knows

Early dark energy, the force invoked by the Johns Hopkins group, might represent a third episode of antigravity taking over the universe and speeding it up

“Maybe the universe does this from time-to-time?”

The team focused in particular on the effects of fields associated with hypothetical particles called axions. Had one such field arisen when the universe was about 100,000 years old, it could have produced just the right amount of energy to fix the Hubble discrepancy, the team reported in a paper late last year. They refer to this theoretical force as “early dark energy.”

As standard candles, quasars aren’t ideal because their masses vary widely. Nevertheless, the researchers identified some regularities in the emissions from quasars, allowing the history of the cosmos to be traced back nearly 12 billion years. The team found that the rate of cosmic expansion deviated from expectations over that time span.

One interpretation of the results is that dark energy is not constant after all, but is changing, growing denser and thus stronger over cosmic time. It so happens that this increase in dark energy also would be just enough to resolve the discrepancy in measurements of the Hubble constant.

The bad news is that, if this model is right, dark energy may be in a particularly virulent and — most physicists say — implausible form called phantom energy. Its existence would imply that things can lose energy by speeding up

As the universe expands, the push from phantom energy would grow without bounds, eventually overcoming gravity and tearing apart first Earth, then atoms

Numerous digs, most notably in Austria and Switzerland, have traced the outlines of the Celts. The artifacts offer evidence going back as far as about 800 B.C. The ancient Greeks and Romans also left written accounts of the Celts, and probably knew them well — the Celts sacked Rome around 390 B.C. and attacked Delphi in Greece in 279 B.C.

It seemed plausible that this group that had invaded Rome had invaded Ireland as well, and in the standard view, it was this people that eventually made it to Ireland.

For decades, however, archaeologists and other scholars have noted just how flimsy the evidence is for that standard account and how broad, nonetheless, is the application of the word.

n recent years, some archaeologists have proposed that the traditional story of the Celts' invasion was, in a sense, exactly wrong — the culture was not imported but exported — originating on the western edge of Europe much earlier than previously thought and spreading into the continent.

it flowed from the western edge of Europe, what he calls “the Atlantic zone” — into the rest of the continent. In many places of the Atlantic zone, he notes, people were buried in passages aligned with the solstices, a sign that they shared a unified belief system.

“From about 5,000 B.C. onwards, complicated ideas of status, art, cosmology were being disseminated along the Atlantic seaways,” Cunliffe said, and that culture then spread eastward.

“If we’re right, the roots of what is known as ‘Celtic’ culture go way way back in time,” Cunliffe said. “And the genetic evidence is going to be an absolute game-changer.”

If the new scholarship proves correct, exactly what to do with the word Celtic will probably be a matter of some dispute: Should it be applied to languages or cultures that, no matter how clearly defined, were largely uninfluenced by the historical Celts of continental Europe?

Complicating any answer are old ethnic antagonisms: The old notions of a distinct “Celtic race” or “Irish race” have been used not just for poetic tributes, but for scorn.

According to the genetic research, the Irish are at the extreme end of a genetic wave that washed across Europe, a wave of migrants that swept westward from above the Black Sea across Europe about 2,500 B.C.

The way to think about genetic variation in Europe is that it is more of a gradient than it is of sharp boundaries," said Bradley, the DNA researcher. "Sometimes, cultural features like language and natural borders can coincide with genetics, but most times not. Genetics is fuzzy, and it doesn't follow political and cultural borders."

"The public will always want a place on the map and for someone to point and say, 'This where the Irish are from,'

"But there’s going to be no way to do that. These groups were frequently traveling east-west across Europe, from one place to another. Everyone is a mix.”

for many white evangelicals, religious and economic spheres are conceptualized as two sides of the same coin. They describe their worldview as one in which the spiritual and the material are mutually dependent and interactive. And the popularity of this worldview cuts across social class.

approximately 31 percent of Americans, many of whom are white evangelical men, believe that God is steering the United States economy, thus fusing their religious and economic interests. These individuals believe in what I call an “Authoritative God.” An Authoritative God is thought to be actively engaged in daily activities and historical outcomes. For those with an Authoritative God, value concerns are synonymous with economic concerns because God has a guiding hand in both. Around two-thirds of believers in an Authoritative God conjoin their theology with free-market economics, creating a new religious-economic idealism. Nearly one-fifth of American voters hold this viewpoint, signaling that it can be a major political force.

Religious-economic idealism is the belief that the free-market works because God is guiding it.

this ideology explains two supposed paradoxes. First, it indicates why some religious working-class Americans have embraced the GOP. It is not that these individuals ignore their class interests, but rather that they believe issues of abortion and gay marriage are linked to whether God is willing to help solve both social ills and their economic woes.

the fact that income does not predict whether an American believes in an Authoritative God indicates that this is not a class-based ideology. Instead, it is a cosmic worldview, which appeals across economic divides. Most clearly, it benefits the wealthy because conservative economic policies tend to favor them. But wealthy Americans with an Authoritative God can also have a religious-like devotion to their economic conservatism. In this way, their economic pragmatism transforms into a type of religious dogmatism. And dogmatism does not bend to changing circumstances and outcomes, so that we can expect believers in religious-economic idealism to cling to laissez-faire policies even when they appear not to work.

religious-economic idealism makes economic and cultural issues fully compatible, which may be a blessing and a curse for the Republican Party. It blesses the GOP with strong support from individuals who may be personally disadvantaged by their economic strategies, but also curses them with an unforgiving and inflexible constituency if political compromise becomes a necessity of governing. In a universe where God decrees no government intervention, any deviation or compromise from the free market is heresy.

Americans who feel that “God has a plan” for them and their country are much more likely to think that “success is achieved by ability rather than luck” and that “able-bodied people who are out of work should not receive unemployment checks.” And over half (54 percent) of Americans who think God controls the economy feel that “anything is possible for those who work hard”; in contrast, only one-quarter of Americans who rely on human resourcefulness, rather than God’s plan, feel this way.

Because evangelicals assert that you alone are responsible for your eternal salvation, it makes sense that the individual is also responsible for his or her economic salvation without government assistance, especially if God is the only assistance you really need.

to recognise that there is no ultimate answer hovering in the depths of space awaiting discovery. Instead, the context provided by the cosmological narrative frees us fully to develop our own, deeply and thoroughly subjective reasons for being.

Rorty sympathizes with the reasons that an ascendant Leftist faction lost faith in American institutions. He is as horrified as they are by the historic treatment of indigenous people and African Americans, and by America’s behavior in the Vietnam War.

But like John Dewey, he rejects self-loathing as “a luxury which agents––either individuals or nations––cannot afford,” and finds other aspects of American history and national character to celebrate.

Today’s Left would more effectively advance social justice if its adherents possessed a historical memory that extended farther back than the 1960s, he argued, to a movement more than a century old “that has served human liberty well.” It would help, for example, “if students became as familiar with the Pullman Strike, the Great Coalfield War, and the passage of the Wagner Act as with the march from Selma, Berkeley free-speech demonstrations, and Stonewall.”

If more Leftists saw themselves as part of that history, with all its achievements, they might continue to lament that “America is not a morally pure country,” but might better understand that “no country ever has been or ever will be,” and that no country will ever have “a morally pure, homogeneous Left” to bring about social justice.

he criticizes the identity politics of the left for developing a politics “more about stigma than about money, more about deep and hidden psychosexual motivations than about shallow and evident greed,” because many of the dispossessed are thereby ignored.

Surveying academia, for example, he observes that “nobody is setting up a program in unemployed studies, homeless studies, or trailer-park studies, because the unemployed, the homeless, and residents of trailer parks are not the ‘other’ in the relative sense. To be other in this sense you must bear an ineradicable stigma, one which makes you a victim of socially accepted sadism rather than merely of economic selfishness.”

For Rorty, a Left that neglects victims of economic selfishness will not only fail; its neglect of class will trigger a terrible backlash that ultimately ill-serve the very groups that Leftist identity politics are intended to help. “The gains made in the past forty years by black and brown Americans, and by homosexuals, will very likely be wiped out,” he worried. “Jocular contempt for women will come back into fashion. The words ‘nigger’ and ‘kike’ will once again be heard in the workplace. All the sadism which the academic Left has tried to make unacceptable to its students will come flooding back. All the resentment which badly educated Americans feel about having their manners dictated to them by college graduates will find an outlet.”

To avoid that future, to compete in national politics, Rorty believed that the Left would have to find a way to better address the consequences of globalization, and that it could only do so by “opening relations with the residue of the old reformist Left, and in particular with the labor unions.

What’s more, the Left “would have to talk much more about money, even at the cost of talking less about stigma.” In service of that transition, he advised the Left to “put a moratorium on theory … to kick its philosophy habit” and  to “try to mobilize what remains of our pride in being Americans.”

The contemporary academic Left seems to think that the higher your level of abstraction, the more subversive of the established order you can be. The more sweeping and novel your conceptual apparatus, the more radical your critique…

it is almost impossible to clamber back down from their books to a level of abstraction on which one might discuss the merits of a law, a treaty, a candidate, or a political strategy.

disengagement from practical politics “produces theoretical hallucinations,” he added. “The cultural Left is haunted by ubiquitous specters, the most frightening of which is called ‘power.’” This obsession with power elicited scathing words:

in committing itself to what it calls “theory,” this Left has gotten something which is entirely too much like religion. For the cultural Left has come to believe that we must place our country within a theoretical frame of reference, situate it within a vast quasi-cosmological perspective.

The cultural Left often seems convinced that the nation-sate is obsolete, and that there is therefore no point in attempting to revive national politics. The trouble with this claim is that the government of our nation-state will be, for the foreseeable future, the only agent capable of making any real difference in the amount of selfishness and sadism inflicted on Americans.

This Left will have to stop thinking up ever more abstract and abusive names for “the system” and start trying to construct inspiring images of the country. Only by doing so can it begin to form alliances with people outside the academy—and, specifically, with the labor unions

Outside the academy, Americans still want to feel patriotic. They still want to feel part of a nation which can take control of its destiny and make itself a better place … Nothing would do more to resurrect the American Left than agreement on a concrete political platform, a People’s Charter, a list of specific reforms.

Instead, “the cultural Left has a preference for talking about ‘the system’ rather than specific social practices and specific changes. The rhetoric of this Left remains revolutionary rather than reformist and pragmatic.

its abandonment of the melting-pot approach to racial justice, its substitution of multiculturalism, has destroyed the solidarity needed to advance justice in any manner

The pre-Sixties reformist Left, insofar as it concerned itself with oppressed minorities, did so by proclaiming that all of us—black, white, and brown—are Americans, and that we should respect one another as such. This strategy gave rise to the “platoon” movies, which showed Americans of various ethnic backgrounds fighting and dying side by side.

the contemporary cultural Left urges that America should not be a melting-pot, because we need to respect one another in our differences. This Left wants to preserve otherness rather than to ignore it… If the Cultural left insists on continuing its present strategy––on asking us to respect one another in our differences rather than asking us to cease noting those differences––then it will have to find a new way of creating a sense of commonality at the level of national politics. For only a rhetoric of commonality can forge a winning majority in national elections.

The cultural Left has a vision of an America in which the white patriarchs have stopped voting and have left all the voting to be done by members of previously victimized groups, people who have somehow come into possession of more foresight and imagination than the selfish suburbanites.

These formerly oppressed and newly powerful people are expected to be as angelic as the straight white males were diabolical. If I shared this expectation, I too would want to live under this new dispensation. Since I see no reason to share it. I think that the Left should get back into the business of piecemeal reform within the framework of a market economy.

This was the business the American Left was in during the first two-thirds of the century.

Our national character is still in the making. Few in 1897 would have predicted the Progressive Movement, the forty-hour week, Women’s Suffrage, the New Deal, the Civil Rights Movement, the successes of second-wave feminism, or the Gay Rights Movement. Nobody in 1997 can know that America will not, in the course of the next century, witness even greater moral progress.

The economy that Hickel envisions would cease to pursue growth, green or otherwise. Materials and energy will still be consumed, and waste generated, but at much lower levels. All impacts on the natural world will be tethered to the question, “Growth for whom, and to what ends?” In place of an individualistic consumer economy, Hickel’s post-growth economy would direct itself toward the creation of public goods that allow the many to live well—mass transit, health care—rather than to keep a few in luxury.

A growing body of research reveals an inverse relationship between “happiness” and growth beyond a certain point.

In the rich countries, general contentment peaked in 1950, when GDP and real per capita incomes were fractions of their present size (and inequality near modern historic lows); degrowthers posit that similar happiness levels will be reclaimed on the way back down the economic mountain

Hickel describes a post-growth economy defined by stability and equality, and the freedom and leisure possible when the economy is no longer subservient to the god of growth

He estimates that the U.S. economy could be scaled down by as much as 65 percent while still improving the lives of its citizens. This includes the metric most often tied to celebrations of endless growth: life expectancy.

degrowth will entail a steep reduction across a much wider range of high-energy consumer goods. Keeping a global economy within safe ecological limits is a zero-sum game.

When limited resources are directed toward clean energy infrastructure, public health care, and regenerative agriculture, it will still be possible to build and power modern 24-hour hospitals in every city, but not to have Xbox consoles, two-car garages, and giant appliances in every home.

would have to redefine it, too.

The post-growth economy could not succeed solely by redistributing wealth; it would have to redefine it, too.

He argues that short-term growth would have to continue in those countries that have still not achieved the basic levels of sanitation, infrastructure, and education needed for a decent standard of living, to close the gap. Their larger goal, meanwhile, would be to break free from their historical role as a source of natural resources and cheap labor for the north.

For degrowth to be just, global, and effective, the sharpest reduction in consumption will have to come from the north, where the greatest damage to the planet is currently being done

Ecological economists generally agree that the safe outer limit is eight tons

One person in a low-income country has a materials footprint of roughly two tons per year, a measure of total raw materials consumed, including those embodied in imports. In lower-middle–income countries, that number is four tons; in upper-middle–income countries, 12 tons. In the high-income nations of North America, Europe, and Asia, the number leaps to 28

The wealthiest 20 percent of the human population is responsible for 90 percent of “overshoot” carbon in the atmosphere (that is, a level of carbon that exceeds the limit needed to keep global temperature rise below 2 degrees Celsius)

The planet’s richest one percent has a carbon footprint twice the size of the poorest half of the world’s population combined

For the global north, degrowth not only starts at home, it starts with the biggest houses.

Less Is More doesn’t end in a poetic appreciation for nature’s majesty, but by teasing out its implications for the political project of preserving a habitable planet. Hickel devotes much of the book to explaining that degrowth must be central to this project, promising not just survival, but real democracy, social abundance, and liberation.

Both involve broad social shifts away from private consumption and toward the production of shared public goods.

This beautiful coincidence overlaps with policy programs like the Green New Deal in important way

In July 1979, shortly after installing a set of solar panels over the West Wing, Jimmy Carter did something peculiar for a peacetime president. He asked Americans to sacrifice: to consume less, take public transit more, value community over material things, and buy bonds to fund domestic energy development, including solar

Next to Schumacher’s “Buddhist economics,” Debsian socialism was reformist tinkering. Schumacher didn’t see liberation as a matter of reshuffling the ownership and management structures of the smokestack-powered growth economy. He believed a deeper transformation was needed to maintain a livable planet. This would require new socioecological blueprints “designed for permanence.” As the left and the right battled for control over growth’s levers and spoils, Schumacher pointed out how both had become blind to the rise of growth as its own self-justifying, pan-ideological religion; its patterns of production and consumption, he observed, required “a degree of violence” that did not “fit into the laws of the universe.”

They determined that infinite growth was, in fact, impossible on a finite planet. Barring a major course correction, the team projected, growthism would result in an ecological systems breakdown sometime in the middle of the twenty-first century

This warning, detailed in the 1972 bestseller The Limits to Growth, has aged better than the scorn heaped on it

We are now witnessing what appears to be the beginnings of the collapse predicted nearly 50 years ago

In his new book, Less Is More, Jason Hickel, an anthropologist and journalist, attempts to bring a comprehensive critique of growth closer to the center of the conversation, arguing through a sweeping history of capitalism that it’s uncontrolled growth, not its controlled arrest and reversal, that is the preposterous concept.

This economic and political revolution was reinforced by a complementary scientific one that displaced the lingering animist cosmology of pre-capitalist Europe. The dualism of Francis Bacon and Descartes held reason to be distinct from and superior to matter.

The idea of limitless growth is a relatively recent one. In Less Is More, Hickel traces its origins to the enclosure of the European commons in the sixteenth century

Starving refugees were scattered and forced into a new economy defined by neo-feudal servitude and wage labor. Landowners, meanwhile, began amassing great stores of surplus wealth.

By the mid-1800s, a new “science” had arisen from these assumptions. Neoclassical economics fully abstracted the economy from the natural world. The economy was geared not toward the creation of a happy and prosperous society, but toward the perpetual growth of wealth as its own end, achieved in an inherently virtuous cycle of converting labor and resources into capital, to be accumulated and reinvested in faster and more productive conversions of labor and resources

This ideology subsumed and profaned notions about progress and morality held by the classical economists, until eventually the field even l

This process unfolded despite repeated warnings along the way. Classical economists like John Stuart Mill and, to a lesser extent, Adam Smith not only acknowledged the existence of natural limits to growth, but saw economic development as a phase; at some point, they believed, nations would create enough wealth to pursue other definitions of progres

the caveats issued by Simon Kuznets, father of the concept adopted in the twentieth century as growth’s universal and signature metric: gross domestic product. Kuznets, Hickel points out, “warned that we should never use GDP as a normal measure of economic progress,” because GDP does not distinguish between productive and destructive behavior

Most people encounter the growth debate, if they encounter it at all, through the idea of “green growth.

This is a vision for our collective future based on the belief that technological advance will drastically reduce the amount of raw materials needed to sustain growth—a process known as dematerialization—and “decouple” growing GDP from its ecological impacts.

boosters of the idea point to the transition by rich countries from manufacturing to service-based economies, as well as efficiency gains in energy and in the use of materials

The belief that green growth will save us, also known as “ecomodernism” or “ecopragmatism,” has become a trendy article of faith among elites who acknowledge climate change and the dangers of breaching ecological boundaries

n 2017, Barack Obama threw his support behind the idea in an article for Science magazine, maintaining that signs of decoupling in major economies “should put to rest the argument that combatting climate change requires accepting lower growth or a lower standard of living.”

The argument that capitalism can grow itself out of the present crisis may be soothing to those who like the world as it is. It also relies on the kind of accounting tricks and rejection of reality

By only counting the emissions created within a country that imports most of its cars, washing machines, and computers, you end up pushing the emissions related to their production off the books. When you factor them back in, the picture is much less green. A number of recent studies show no evidence of meaningful decoupling—in energy or materials—even as the world increases its use of renewable energy and finds ways to use some materials more efficiently.

Green growth, Hickel concludes, is an ecologically incoherent “fairy tale.”

consider what the ecomodernist position asks us to believe. The current system requires annual growth of roughly 3 percent to avoid the shock of recession. This means doubling the size of the economy every 23 years

he economy of 2000 must be 20 times larger in the year 2100, and 370 times larger in the year 2200.

Hickel is less interested in the macroeconomic details of this future than are growth critics based in economics departments, like Tim Jackson and Kate Raworth, and more focused on the leisure, security, and general human flourish

he makes an alluring case that degrowth does not require anything like the “command-and-control fiasco of the Soviet Union, or some back-to-the-caves, hair-shirted disaster of voluntary impoverishment.”

Attaining the benefits of the post-growth economy would, however, require what the present consumer society considers “sacrifices.

it’s not clear how many of them are ready to give up its superficial pleasures enabled by consumer debt

Among nations, there’s also the question of fairness: Wouldn’t it be unjust to impose degrowth across the world, when it’s disproportionately the countries of the global north that have spent centuries burning through the planet’s resources?

This output tracks to the one percent’s share of global wealth—a number equal to the GDP of the bottom 169 countries.

Even if you accept the argument that inequality would be best addressed by more centuries of trickle-down growth, you keep running up against the simple fact of its impossibility. Even just one more century of growth—which so far has shown no sign of taking a less destructive form—will require multiple earths

Hickel is serious about bringing the system critiques of E.F. Schumacher and others out of their traditional cloisters and into the streets, and has sought allies in this effort

emphasize what Hickel calls the “beautiful coincidence” of degrowth: that “what we need to do to survive is the same as what we need to do to have better lives.”

Both are internationalist in outlook, and see the world through a lens of climate justice as well as climate equilibrium.

that is, communicating the many benefits of moving beyond the insecurity and terrors of the current system, and building a new society that is sustainable, stable, democratic, and fundamentally better in every way.

Like the Capgras patient, we risk becoming detached from the world we can see and touch. Regardless of whether we can prove that the multiverse exists, the idea of it can distract us from doing the work we need to do to make this world better

In 1957, a year after Lewis published his last Narnia book, a Princeton doctoral student, Hugh Everett III, published a dissertation bringing the ancient idea of the simultaneous existence of several worlds into the realm of modern science.

Everett was trying to solve a seeming paradox in quantum theory: Certain elementary particles (say, a photon) seemed to exist mathematically in many places at once but could be detected at only one location at a time.

Perhaps, Everett suggested, the act of detecting the particle splinters reality; perhaps the observer, and indeed the universe, splits into different possible timelines, one for each possible location of the particle. This would become known as the many-worlds interpretation

In my 30s, I knew I had to save myself from the enticements of alternate realities. So I envisioned a new cosmology of time

I felt a horrible sense of vertigo as I watched the life I’d been expecting to live tilting away from me. In this new timeline, my stepsiblings were no longer my siblings; they would become, instead, just people I knew for a while in high school.

For years, I couldn’t stop thinking about other, better timelines where it didn’t happen, where my stepfather was still alive and my family intact. It helped me understand what was missing, but it did not allow me to mourn what I’d lost.

And that’s the peril of the multiverse; I was becoming unreal to myself, nostalgic not for a time before the death happened but for a timeline in which it never happened at all.

In “Everything Everywhere,” Joy, the character played by Stephanie Hsu, has become aware of every possible timeline. She succumbs to nihilistic despair. If everything is happening, then nothing can matter.

We can joke or wonder whether we’re in the wrong timeline. But we can’t lose sight of the fact that this timeline is the only one we’ve got.

When I was 12, my mother met a man, and suddenly the family I’d imagined for myself became real. I had an older brother who loved puns and an older sister who wrote poems.But when I was 19, my stepfather died of melanoma; within a few years of recriminations and disputes, our blended family unblended itself.

Instead of a linear, branching timeline with multiple, parallel possibilities — so much more vivid than my real life — I tried to imagine time as a sphere always expanding away from me in every direction, like the light leaving a star.

In this model of time, instead of the past receding behind me, it expands outward to surround me, always there and always present. The future is at the very center of the sphere, curled up infinitely small inside of me, waiting to be realized. That way, I can believe that there is nothing to come that I do not already contain

if we have to believe in something invisible, let me believe in a version of the universe that keeps my focus where it belongs: on the things I can touch and change.