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Volcanic ash, more generally known as tephra, sometimes hides in ice. It’s a special find because it can be geochemically tied to a specific volcano. “The tephra comes from the magma itself,

Sulfur is also indicative of a past eruption. Sulfur dioxide, a gas commonly belched by erupting volcanoes, reacts with water in the atmosphere to create sulfate aerosols. These tiny particles can linger in the stratosphere for years, riding wind currents, but they, like tephra, eventually fall back to Earth.

The ice also carries a time stamp. Dr. McConnell and his colleagues look for variations in elements like sodium, which is found in sea spray that’s seasonally blown inland. By simply counting annual variations in these elements, it’s possible to trace the passage of time, Dr. McConnell said. “It’s like a tree-ring record.”

In layers of ice corresponding to the early months of 43 B.C., they spotted large upticks in sulfur and, crucially, bits of material that were probably tephra. The timing caught the scientists’ attention.

Researchers have previously hypothesized that an environmental trigger may have helped set in motion the crop failures, famines and social unrest that plagued the Mediterranean region at that time. But until now, “There hasn’t been the kind of data that these scholars brought forth to really get those theories into the mainstream,”

The match was spot on, Dr. Plunkett said. “There are some events that are tricky. With Okmok, there’s nothing else that looks like it.”

This eruption was one of the largest of the last few millenniums, Dr. McConnell and his collaborators concluded, and the sulfate aerosols it created remained in the stratosphere for several years. These tiny particles are particularly good at reflecting sunlight, which means they can temporarily alter Earth’s climate.

“They’ve created, for a short term, global cooling events,”

Using climate models to simulate the impact of an Okmok eruption, Dr. McConnell and his collaborators estimated that parts of the Mediterranean, roughly 6,000 miles away, would have cooled by as much as 13.3 degrees Fahrenheit.

“It’s an incredible coincidence that it happened exactly in the waning years of the Roman Republic when things were falling apart,”

That climate shock came at precisely the wrong time, Dr. Clark said. “This was a period of Mediterranean-wide political, social and economic upheaval.”

Historical records compiled by Roman writers and philosophers note food shortages and famines. In 43 B.C., Mark Antony, the Roman military leader, and his army had to subsist on wild fruit, roots, bark and “animals never tasted before,” the philosopher Plutarch wrote.

For a society already reeling from the assassination of Julius Caesar the year before, such trying conditions might have exacerbated social unrest, the researchers concluded. They might even have kick-started transfers of political power that led to the rise of the Roman Empire.

Rain patterns changed as well — some regions would have been drenched by 400 percent more precipitation than normal, the modeling revealed.

The links in the study are probable, but not definite. “They’re not being heavy handed and saying this is absolutely it,” Dr. Holmberg said.

Egyptian society, before the installation of the Aswan Low Dam in the early 20th century, was anchored by the annual summer flooding of the Nile River. These summer floods, sustained by monsoon rains in the highlands of Ethiopia, delivered irrigation and silt, both critical to Egypt’s agrarian society. “The whole rhythm of the year was built around responding to the flood,” Dr. Manning of Yale said.

But volcanic eruptions, even those on the other side of the world, could have disrupted that flooding, Dr. Manning and his colleagues recently showed. Using records from Cairo’s Nilometer — an octagonal marble column that was used for recording Nile flood height from 622 to 1902 A.D., the team found that flooding tended to be weaker, or entirely absent, during years when there was a large volcanic eruption somewhere in the world.

he culprit, the team reasoned in a paper published a few years ago, was cooling caused by sulfate aerosols. When Earth cools after a large eruption, its atmospheric circulation patterns change. That can shift the invisible meeting point of Northern and Southern Hemisphere trade winds — the Intertropical Convergence Zone — that affects where monsoon rains tend to fall. When less precipitation falls over Ethiopia, home to a major tributary of the Nile, there’s less water available for flooding that year.

Ptolemaic-era records revealed that this reduced flooding had socioeconomic and political consequences. Revolts increased in the years following “Nile failure,” Dr. Manning and his colleagues found. Priestly decrees — intended to establish the political legitimacy of Greek rulers — also became more commonplace.

“There are still large unsourced mystery eruptions up until the early 19th century.”

Right now, roughly a dozen volcanoes are erupting. In all likelihood, they’re nothing to worry about — it’s doubtful you’ve even heard of them. But every once in a while, there’s bound to be a really big eruption. How its effects ripple around the world awaits to be seen.

But the more cataclysmic "explosive" eruptions are still likely, Jati said, with the potential for erupting volcanic material up to about 2 miles from the summit. Lava avalanches and hot clouds could reach more than 3 miles to the southwest.

Based on observations of the volcano begun in early November, "it is concluded that the volcanic activity of Mount Merapi is still quite high in the form of effusive eruptions," said Raditya Jati of the Indonesian National Board for Disaster Management. "Effusive" eruptions are those in which lava steadily flows onto the ground.

Mining companies have been advised to temporarily suspend work in the river that originates at Mount Merapi, and tourism companies have been asked to temporarily stay away from "areas of potential danger and crater openings" up to 3 miles away.

officials urged residents of coastal areas in much of the West Coast, Alaska and Hawaii to stay away from the coastline and move to higher ground. The National Weather Service in Portland, Ore., reported possible one- to three-foot waves in some areas of Oregon and Washington.

In California, water surged into Santa Cruz Harbor on Saturday morning, damaging boats, submerging the parking lot and causing people to evacuate the docks, sidewalks and nearby stores

In the Bay Area, the National Weather Service said tsunami surges of up to a few feet could arrive in “pulses” throughout the day, and warned residents not to try to identify their arrival.

Jaclyn Rothenberg, a spokeswoman for the Federal Emergency Management Agency, said the agency did not expect damages from the tsunami, and stressed the importance of disaster preparedness.

She added that the agency had coordinated with its partners in American Samoa and Hawaii, which had “no impacts from this event.”

Across the Pacific warnings were sounded. New Zealand’s National Emergency Management Agency advised people in coastal areas to expect “strong and unusual currents and unpredictable surges at the shore.” And on their Facebook pages, the meteorological services for Fiji and Samoa also issued alerts, advising people to stay away from low-lying coastal areas.

The volcano, Hunga Tonga-Hunga Ha’apai, which is about 40 miles north of Tongatapu, had been relatively inactive for several years. It began erupting intermittently in December but by Jan. 3 the activity had decreased significantly, according to a report by the Smithsonian Institution’s Global Volcanism Program.

Satellite imagery of the eruption on Saturday, shared on Twitter by New Zealand’s National Institute of Water and Atmospheric Research, showed a “brief spike in air pressure as the atmospheric shock wave pulsed across New Zealand.”

The V.E.I. of the eruption Saturday has not been estimated yet, but before the eruption, the volcano was estimated to be able to produce an eruption with a maximum V.E.I. of 2.

islands.“Communication with Tonga remains very limited. And I know that is causing a huge amount of anxiety for the Tongan community here,” Ardern said.

water a vital need.Aid agencies said thick ash and smoke had prompted authorities to ask people to wear masks and drink bottled water.

Tsunami advisories were earlier issued for Japan, Hawaii, Alaska and the U.S. Pacific coast. The U.S. Geological Survey estimated the eruption caused the equivalent of a magnitude 5.8 earthquake. Scientists said tsunamis generated by volcanoes rather than earthquakes are relatively rare.

“It’s really bad. They told us to stay indoors and cover our doors and windows because it’s dangerous,” she said. “I felt sorry for the people. Everyone just froze when the explosion happened. We rushed home.” Outside the house, people were seen carrying umbrellas for protection.

One complicating factor to any international aid effort is that Tonga has so far managed to avoid any outbreaks of COVID-19. Ardern said New Zealand's military staff were all fully vaccinated and willing to follow any protocols established by Tonga.

In a video posted on Facebook, Nightingale Filihia was sheltering at her family's home from a rain of volcanic ash and tiny pieces of rock that turned the sky pitch black.

The tsunami waves caused damage to boats as far away as New Zealand and Santa Cruz, California, but did not appear to cause any widespread damage. Snider said he anticipated the tsunami situation in the U.S. and elsewhere to continue improving.

“We are praying that the damage is just to infrastructure and people were able to get to higher land,” she said.U.S. Secretary of State Antony Blinken wrote on Twitter he is “deeply concerned for the people of Tonga as they recover from the aftermath of a volcanic eruption and tsunami. The United States stands prepared to provide support to our Pacific neighbors.”

On Tonga, which is home to about 105,000 people, video posted to social media showed large waves washing ashore in coastal areas and swirling around homes, a church and other buildings. A Twitter user identified as Dr. Faka’iloatonga Taumoefolau posted video showing waves crashing ashore

The explosion of the Hunga Tonga Hunga Ha’apai volcano, about 64 kilometers (40 miles) north of Nuku’alofa, was the latest in a series of dramatic eruptions. In late 2014 and early 2015, eruptions created a small new island and disrupted international air travel to the Pacific archipelago for several days.

“The surface area of the island appears to have expanded by nearly 45% due to ashfall,” Planet Labs said days before the latest activity.

Savannah Peterson watched in shock as the water rose several feet in a matter of minutes in front of her oceanfront house in Pacifica, California, just south of San Francisco.

In northern Peru's Lambayeque region, two women drowned after being swept away by ″abnormal waves″ following the eruption, authorities said. A dozen restaurants and a coastal street were also flooded along El Chaco beach in Paracas district.

But researchers say that’s not how supervolcanoes work and cast doubts for a prophetic outburst.

“When a volcano is called a supervolcano, what we really mean is it had a super eruption once, at least, in the past,”

The last V8 eruption occurred around 27,000 years ago in Taupo, New Zealand.

Scientists can’t see what is stirring below the surface of Campi Flegrei with their naked eyes, but Kilburn said the recent activity could be underground molten rock and fluids readjusting themselves. Those movements appear as earthquakes on the surface.

Out of more than 1,000 known volcanoes in the world, only about 20 are supposedly supervolcanoes. Technically, they are defined as those that register the highest on the volcanic explosivity index, which runs from V1 (nonexplosive) to V8 (colossal eruption

Such a super eruption ejects a volume of around 1,000-cubic kilometers or more — about a thousand times bigger than Mount St. Helens (V5), which caused mudslides, fires, floods and more than 50 deaths in 1980.

“But that doesn’t mean that it’s going to have other super eruptions in the future. … Very, very, very large eruptions are much, much rarer.”

Yellowstone, one of the world’s most famous supervolcanoes, measures 30 by 45 miles and welcomes millions of tourists to its park. Its largest eruption occurred 2.1 million years ago, ejecting more than 2,400 cubic kilometers of material. Like many caldera systems, the majority of Yellowstone’s eruptions have since been much smaller.

Supervolcano is “a made-up word,” said volcanologist Michael Poland, scientist in charge at the Yellowstone Volcano Observatory. “I think it’s misleading. I think it’s misapplied. I can’t stand that term. I wish it would go into the dustbin, but it’s too sexy.”

It implies an apocalyptic-like explosion, but no volcanic eruption has caused a mass extinction to our knowledge

The largest volcanic explosion in the geologic record is thought to have occurred in Toba, Indonesia, around 74,000 years ago, registering a V8 on the volcanic explosivity index. S

scientists initially speculated that the eruption almost wiped out humanity because populations declined shortly after, but archaeological evidence showed Homo sapiens farther away were thriving after the eruption.

“No explosive volcanic eruption that we know of has ever been associated with a mass extinction of plant or animal life,” said Poland, who’s also a scientist at the U.S. Geological Survey (USGS). “That’s not to say it wouldn’t be devastating or hard to live.”

This volcanism-induced warming, far-removed from the extinction, casts blame squarely on the Chicxulub event. “I’m sure the debate will rage on, because there are entrenched voices on either side,” Dr. Brusatte said. “But it’s getting harder and harder to fathom that the asteroid was innocent.”

There is one case 65 million years ago, at a point in time known as the Cretaceous-Tertiary boundary (K-T boundary), with strong evidence supporting an asteroid impact around the same time the dinosaurs disappeared.

“That one instance really guided everybody’s thinking, and the idea that impacts caused mass extinctions was really, really popular,” said Renne, who wasn’t involved in the Blackburn study.

enne says that even the asteroid impact at the K-T boundary likely only finished the job that major volcanic eruptions in India started. (Related: “What Killed Dinosaurs: New Ideas About the Wipeout.”)

Thousands of earthquakes took place in the weeks leading up to the eruption,

Earlier this week, swarms of earthquakes rattled the peninsula, with over 3,000 quakes on Sunday alone. The strongest tremors took place around Fagradalsfjall Mountain.

Scientists attributed the earthquakes to magma intrusions, molten rock movement about a kilometer below the earth's crust. Meteorological officials first mentioned the possibility of an eruption on March 3,

The chances of an eruption escalated in recent days as magma flows concentrated around the southern portion of Mt. Fagradalsfjall

Scientists declared the mountain the most likely point should an eruption take place. Seismic activity on the peninsula decreased Friday before the mountain ultimately erupted.

It is not expected to cause havoc in air travel as did ash from the Eyjafjallajökull eruption in 2010.

the European super-nation has long needed to believe itself above the world, above native America, above Asia, and particularly above Africa. The truth is more disconcerting: The dark continent has never been South of the Sahara, but South of Minsk and East of Aachen in the jungles of the European soul. 

I don't have any gospel of my own. Postwar, and the early pages of Bloodlands, have revealed a truth to me: I am an atheist. (I have recently realized this.) I don't believe the arc of the universe bends towards justice. I don't even believe in an arc. I believe in chaos. I believe powerful people who think they can make Utopia out of chaos should be watched closely.

I don't know that it all ends badly. But I think it probably does.

I'm also not a cynic. I think that those of us who reject divinity, who understand that there is no order, there is no arc, that we are night travelers on a great tundra, that stars can't guide us, will understand that the only work that will matter, will be the work done by us.

Maybe the very myths I decry are necessary for that work. I don't know. But history is a brawny refutation for that religion brings morality.

"History contributes to the disenchantment of the world," writes Judt. ...most of what it has to offer is discomforting, even disruptive—which is why it is not always politically prudent to wield the past as a moral cudgel with which to beat and berate a people for its past sins.

But history does need to be learned—and periodically re-learned. In a popular Soviet-era joke, a listener calls up ‘Armenian Radio’ with a question: ‘Is it possible’, he asks, ‘to foretell the future?’ Answer: ‘Yes, no problem. We know exactly what the future will be. Our problem is with the past: that keeps changing’.  So it does—and not only in totalitarian societies. 

All the same, the rigorous investigation and interrogation of Europe’s competing pasts—and the place occupied by those pasts in Europeans’ collective sense of themselves—has been one of the unsung achievements and sources of European unity in recent decades. It is, however, an achievement that will surely lapse unless ceaselessly renewed.

Europe’s barbarous recent history, the dark ‘other’ against which post-war Europe was laboriously constructed, is already beyond recall for young Europeans.  Within a generation the memorials and museums will be gathering dust—visited, like the battlefields of the Western Front today, only by aficionados and relatives. If in years to come we are to remember why it seemed so important to build a certain sort of Europe out of the crematoria of Auschwitz, only history can help us.

If Europeans are to maintain this vital link—if Europe’s past is to continue to furnish Europe’s present with admonitory meaning and moral purpose—then it will have to be taught afresh with each passing generation. ‘European Union’ may be a response to history, but it can never be a substitute.

Smil’s “prime movers,” which he defines as “energy converters able to produce kinetic (mechanical) energy into forms suitable for human use.” For most of the time that there have been humans on earth, the best prime movers have been people

while Smil agrees with pretty much everyone else that the next big energy transition is from nonrenewable to renewable resources, he is cautious about the timing. At one level, the change is plainly inevitable.

Things really kicked off with the invention of the steam engine in the 1700s—the first prime mover powered by fuels (100,000W in 1800; 3,000,000W in 1900). This was followed by the steam turbine (75,000W in 1890; 25,000,000W in 1914). The prime-mover revolution is rounded out by the internal-combustion engine in the later half of the 1800s and the gas turbine in the 1930s

Smil is concerned with the series of transitions that have occurred throughout human history, both in terms of resources and prime movers. These transitions are somewhat interrelated, but not completely. For example, you can run a steam turbine off of wood, coal, or nuclear power so a transition between those resources does not necessitate a change in prime movers. On the other hand, you can’t feed an internal-combustion engine with wind or wood. At the moment, all of our best prime movers rely heavily on fossil fuels.

how prime movers have increased in power over the course of history. Remember that orange lifted to a counter? If you expend that effort over a second, that's 1W (a watt) of work. Smil calculates that the average healthy human can sustain 60W–100W of work throughout a working day. At some point in prehistory, people started yoking domesticated animals (250W–800W depending on the breed). Then came sails, then a few thousand years later, waterwheels (2,000W–4,000W in medieval times) and then a thousand years after that, windmills (1,000W–10,0000W in 1900).

The barriers to total conversion—much like the problems that plague our energy infrastructure—are a funny mixture of policy, technology, infrastructure, and physics

Where he does differ is in his opinion about how quickly it can happen. Where Gore calls for a complete conversion to renewables in 10 years, Smil thinks the transition will take generations.

For example, the possibility that nuclear power might take up any of the load in the U.S. seems extremely low, given that no new plants have been built since the 1970s. That’s not a physics problem, that’s a policy problem.

As far as converting to wind and solar, Smil sees much bigger technological and infrastructural hurdles. A switch to renewables means a transition in terms of both resources and prime movers.

The character of renewable resources is fundamentally different from that of fossil fuels. Where fuels are highly dense stores of energy and relatively easy to reliably transport, the renewables are characterized by the highly fickle ebbs and flows of nature. Some days are sunny, others have clouds.

Energy density is sometimes used to discuss the capacity of volumes of batteries and fuel. Smil is interested instead in measuring energy per unit of the earth’s surface. He uses the figure as a means to try to compare the various means of producing energy and the demands for using it.

to measure the energy density of coal, you look at how much energy you get from burning coal and divide that by how much of the earth’s surface needs to be given over to coal production to get it.

Because the best way of mitigating the irregularity in how they generate power is to create interconnected grids, an energy regime based on wind and solar needs to lay a lot of power lines through a lot of jurisdictions and permitting regimes. Physics meets infrastructure, and policy. Renewables are simply more diffuse.

“Mass adoption of renewable energies would thus necessitate a fundamental reshaping of modern energy infrastructures,” Smil writes. We'd go from harvesting energy from concentrated sources and diffusing it outwards, to gathering energy from diffuse sources and concentrating it inwards towards relatively few centers. This is, fundamentally, a very different way of organizing how we use land.

This is not impossible, and in the long run it is probably inevitable. But we underestimate the effort required and changes that will be necessary at our peril.

The switch from wood to coal ushered in industrialization which completely upended social-structures and human relationships all over the world. The rise of oil transformed geo-politics, turning some countries into energy superpowers overnight. No one knows how deeply our society might be transformed by the transition to renewables. Or whether we'll be able to do it fast enough.

Fingernail clippings and locks of the sultan's hair are offered to the sea goddess every year. They are also offered to the ogre Sapu Jagat inside Mount Merapi, one of Indonesia's most active volcanoes that looms over the city.

So Yogyakarta is the only place in Indonesia where residents don't get to directly elect their leader. When it was suggested by Jakarta that this should change in 2010 there were angry protests on the streets of Yogyakarta and the central government backed down.

Veneration of objects or idols, and hints to polytheism, run in conflict with the Wahhabis strain of Islam that is growing in popularity in Java.

Recently the daughter of Indonesia's first President Sukarno, Sukmawati, was reported to the police for blasphemy and forced to apologise for saying in a poem that the Javanese hairbun was more beautiful than a Islamic chador.

The sultan's extended family accuses the queen, who is a senator in the national parliament, of leading the revolt against tradition.

Many scientists have been warning us for years, citing a pace of extinctions far beyond the historical "background" rate. Yet critics have argued that's based on inadequate data, preserving doubt about the scope of modern wildlife declines. To see if such doubt is justified, the 2015 study compared a conservatively low estimate of current extinctions with an estimated background rate twice as high as those used in previous studies. Despite the extra caution, it still found species are disappearing up to 114 times more quickly than they normally do in between mass extinctions

six important things to know about life in the sixth mass extinction:

1. This isn't normal.

"Even under our assumptions, which would tend to minimize evidence of an incipient mass extinction, the average rate of vertebrate species loss over the last century is up to 114 times higher than the background rate," the study's authors write. "Under the 2 E/MSY background rate, the number of species that have gone extinct in the last century would have taken, depending on the vertebrate taxon, between 800 and 10,000 years to disappear.

ndicating that a sixth mass extinction is already under way."

2. Space is at a premium.

The No. 1 cause of modern wildlife declines is habitat loss and fragmentation, representing the primary threat for 85 percent of all species on the IUCN Red List. That includes deforestation for farming, logging and settlement, but also the less obvious threat of fragmentation by roads and other infrastructure.

3. Vertebrates are vanishing.

The number of vertebrate species that have definitely gone extinct since 1500 is at least 338,

Even under the most conservative estimates, the extinction rates for mammals, birds, amphibians and fish have all been at least 20 times their expected rates since 1900, the researchers note (the rate for reptiles ranges from 8 to 24 times above expected). Earth's entire vertebrate population has reportedly fallen 52 percent in the last 45 years alone

he threat of extinction still looms for many — including an estimated 41 percent of all amphibian species and 26 percent of mammals.

4. It's probably still worse than we think.

The 2015 study was intentionally conservative, so the actual rate of extinctions is almost certainly more extreme than it suggests

The study also focuses on vertebrates, which are typically easier to count than smaller or subtler wildlife like mollusks, insects and plants. As another recent study pointed out, this leaves much of the crisis unexamined. "Mammals and birds provide the most robust data, because the status of almost all has been assessed," the authors of that study write. "Invertebrates constitute over 99 percent of species diversity, but the status of only a tiny fraction has been assessed, thereby dramatically underestimating overall levels of extinction.

we may already have lost 7 percent of [contemporary] species on Earth

5. No species is safe.

"If it is allowed to continue, life would take many millions of years to recover, and our species itself would likely disappear early on," says Gerardo Ceballos of the Universidad Autónoma de México, lead author of the 2015 study. "We are sawing off the limb that we are sitting on,"

6. Unlike an asteroid, we can be reasoned with.

Yes, billions of dinosaur bodies died and fell to the Earth here in this span, and trillions more dinosaur footsteps pressed into the Earth, but hardly a trace remains today. A cryptic smattering of lakeside footprints represents their entire contribution to the Triassic period. A few bones and footsteps miraculously preserved in New England and Nova Scotia are all that remains from the entire 27-million-year Early Jurassic epoch. No trace of dinosaurs remains whatsoever from the 18-million-year Late Jurassic. A handful of bones from one layer in Maryland represents the entire 45-million-year Early Cretaceous; the Late Cretaceous gives up a Hadrosaurus in New Jersey, and part of a tyrannosaur in Alabama, but mostly comprises unimpressive fragments of bone and teeth that cover the remaining 34 million years of the Earth’s most storied age, until doomsday

So that’s what 180 million years of complete dominance buys you in the fossil record. What, then, will a few decades of industrial civilization get us? This is the central question of the Anthropocene—an epoch that supposedly started, not tens of millions of years ago, but perhaps during the Truman administration

as the example of the dinosaurs shows, the chance that any city-swallowing delta deposit from a window of time only a few centuries wide would be lucky enough to be not only buried and preserved for safekeeping, but then subsequently not destroyed—in the ravenous maw of a subduction zone, or sinking too close to the cleansing metamorphic forge of Earth’s mantle, or mutilated in some m

there exists a better word in geology than epoch to describe our moment in the sun thus far: event. Indeed, there have been many similarly disruptive, rapid, and unusual episodes scattered throughout Earth history—wild climate fluctuations, dramatic sea-level rises and falls, global ocean-chemistry disasters, and biodiversity catastrophes

nd then, after all that, find itself, at a given point in the far future, fantastically lucky enough to have been serendipitously pushed up just enough so as to be exposed at the surface, but not too high as to have been quickly destroyed by erosion … is virtually ni

What else of us could be sampled from this sliver of deep-sea-muck-turned-rock—these Anthropocene clays and shale layers? Pass it through a mass spectrometer and you would see, encoded in its elements, the story of the entire planet in this strange interval, the Great Derangement of the Earth’s systems by civilization. You would see our lightning-fast injection of hundreds of gigatons of light carbon into the atmosphere written in the strange skew of carbon isotopes in this rock—as you do in rocks from the many previous carbon-cycle disasters of Earth history. The massive global-warming pulse created by this carbon disaster would be written in oxygen isotope

The sulfur, nitrogen, thallium, and uranium isotopes in these rocks (to mention just a few) would whisper to you—again, in squiggles on a graph—that the global ocean lost much of its oxygen during this brief but enigmatic interval. Strontium isotopes would tell you that rock weathering dramatically accelerated worldwide for a few tens of thousands of years as sweltering, violent storms attacked the rocks and wore down the continents during a brief, CO2-driven fever.

The most enduring geological legacy, instead, will be the extinctions we cause. The first wave of human-driven extinctions, and the largest hit to terrestrial megafauna since the extinction of the dinosaurs, began tens of thousands of years ago, as people began to spread out into new continents and islands, wiping out everything we tend to think of as “Ice Age” faun

we’re very likely to return to our regularly scheduled programming and dive back into a punishing Ice Age in the next half-million years. This means that sea level—after shooting up in the coming millennia by our own hand, and potentially burying coastal settlements in sediment (good for fossilization)—will eventually fall hundreds of feet below where it is today, and subject the shallow continental shelves, along with our once submerged cities and magnificent seams of garbage, to the cold winds of erosion (bad for fossilization), where they’ll be mostly reduced to nothing

The first major mass extinction, 445 million years ago, took place in multiple pulses across a million years. An event. The second major mass extinction, 70 million years later, took place over 600,000 years—400,000 years longer than the evolutionary history of Homo sapiens.

The idea of the Anthropocene inflates our own importance by promising eternal geological life to our creations. It is of a thread with our species’ peculiar, self-styled exceptionalism—from the animal kingdom, from nature, from the systems that govern it, and from time itself. This illusion may, in the long run, get us all killed.

And then there’s another question. Even if we can survive, is that the world you want to live in? Is that the world you want all future generations of humans to live in? That’s a different question. But they’re both extremely serious. I would say they really couldn’t be more serious.