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The resulting intellectual battle over ‘what happened’ at this moment in time reflects developments in historical and memorial practice over the centuries

During the 1650s and especially on the occasion of Charles’ Restoration in 1660, the story was celebrated and narrated

The tree itself became a central part of a particular memorial culture. Pepys says that the king took a cutting from the tree and planted it in St James’s Park

The memory of the event became more and more suffused into English culture. Though abolished in 1859, there are still celebrations around the country relating to ‘Oak Apple Day’

The event has become a complex part of English memorial culture: as a historiographic debate, heritage, a site of tourism and memory, something to be owned, a place to drink, something to spend. Memory, heritage and history work in strange, fascinating, non-linear ways, through England into France, and tracing these various trajectories reveals to us the complexity of consumption of the past.

They were able to reverse engineer the ancient climate by analyzing temperature-sensitive structures of lipids produced by fossil bacteria and archaea living in these bygone wetlands, and preserved for all time in the coal. The team found that, under this past regime of high CO2, in the ancient U.K., Germany, and New Zealand, life endured mean annual temperatures of 23–29 degrees Celsius (73–84 degrees Fahrenheit) or 10–15 degrees Celsius (18–27 degrees Fahrenheit) warmer than modern times.

“These wetlands looked exactly how only tropical wetlands look at present, like the Everglades or the Amazon,” Naafs says. “So Europe would look like the Everglades and a heat wave like we’re currently experiencing in Europe would be completely normal. That is, it would be the everyday climate.”

But over 50 million years ago this would have been the baseline from about 45 to 60 degrees latitude. Under this broiling regime, with unprecedented heat as the norm, actual heat waves might have begun to take on an unearthly quality.

closer to the equator in this global sweat lodge, the heat might have been even more outrageous, shattering the limits of complex life. To see exactly how hot, Naafs’ team also analyzed ancient lignite samples from India, which would have been in the tropics at the time—that subcontinent still drifting across the Indian Ocean toward its eventual mountain-raising rendezvous with Asia. But unfortunately, the temperatures from these samples were maxed out. That is, they were too hot for his team to measure by the new methods they had developed.

“Some climate models suggest that the tropics just became a dead zone with temperatures over 50 degrees Celsius (122 degrees Fahrenheit) like in Africa and South America,” says Naafs. “But we have no data so we don’t know.”

“Basically every type of paleoclimate research that’s being done shows that high CO2 means that it’s very warm. And when it gets very warm, it can be really, really, really warm.

“You start really looking into them and you go, ‘Wow. We are dealing with a rainforest.’”

Though there are no trees here at the top of the world, there are tree stumps. And they are around 50 million years old.

One obvious way to reconcile this disparity is by noticing that the changes to the ancient earth took place over hundreds-of-thousands to millions of years and (IPCC graphs notwithstanding) that time won’t stop at the end of the 21st century. The changes that we’ve already set in motion, unless we act rapidly to countervail them, will similarly take millennia to fully unfold

we’re clearly not content to stop at just 400 ppm. If we do, in fact, push CO2 up to around 1,000 ppm by the end of the century, the warming will persist and the earth will continue to change for what, to humans, is a practical eternity

Most worryingly, the climate models that we depend on as a species to predict our future have largely failed to predict our sultry ancient past.

we know methane can actually amplify high-latitude warming, so maybe that’s some of the missing feedback.

“You’ve got alligators, giant tortoises, primates, things like that. We have these big hippo-like animals called Coryphodon. You have tapirs—so you’ve got tapirs living pretty close to the North Pole in the early Eocene, which today—clearly tapirs are not at the North Pole,” she says, laughing.

Clearly we are missing something, and Naafs thinks that one of the missing ingredients in the models is methane, a powerful greenhouse gas which might help close the divide between model worlds and fossil worlds.

We know tropical wetlands pump much more methane into the atmosphere compared to [cooler] wetlands.

The last time CO2 was at 400 ppm (as it is today) was 3 million years ago during the Pliocene epoch, when sea levels were perhaps 80 feet higher than today.

Naafs thinks that many of the wildest features of the early age of mammals could be recreated.

The Earth itself is our greatest ally in this effort. Ecosystems like California’s kelp forests absorb about half of the greenhouse gases humans emit, studies show. Without them, warming would be even worse. Nature shields us from the worst consequences of our own actions, forgiving the sins we refuse to repent.

If we hope to solve climate change, humanity must also address this biodiversity crisis — restoring ecosystems and the creatures that inhabit them.

One way to revitalize ecosystems: protect the ground they grow from.Think of the soft, spongy soil of an old-growth woodland. Here, a towering oak tree draws up water and nutrients via threadlike fungi attached to its roots. In exchange, the fungi take sugar from the oak, funneling carbon from the air into the ground.Now imagine a leaf from that oak drifting slowly to the forest floor. Perhaps it becomes food for an earthworm. Then microbes attack the earthworm’s droppings, breaking down the residue further still.Eventually, the carbon that was once a leaf can become trapped in clods of earth. Other atoms may form strong chemical bonds with minerals like iron, which prevents them from reacting with oxygen and returning to the air. Under the right conditions, carbon might stay locked away in dense, dark earth for centuries. Soils contain more carbon than the entire atmosphere and all the world’s plants combined.

This makes soil both a ticking time bomb and an overlooked climate solution

“And because soil is such an important reservoir,” Berhe said, “a small change in the release of that carbon can lead to a big change in the concentrations of greenhouse gases in the atmosphere.”

A 2020 analysis in the journal Nature Sustainability found that better soil stewardship could reduce emissions by at least 5.5 gigatons of carbon dioxide each year — about 15 percent of current annual emissions.

“Once that happens,” Berhe said, “it’s not just the carbon status of the soil that’s improved. The soil literally becomes softer. It holds more water and nutrients. It’s easier for plants to grow in … and serve as a home for the most abundant and diverse group of organisms that we know of.

Enhancing carbon in soils is just the beginning. In 2017, an international team of scientists set out to determine how much carbon the planet could pull out of the atmosphere, if humans would only give it a chance. In a study in the Proceedings of the National Academy of Sciences (PNAS), they concluded natural climate systems are capable of storing almost 24 gigatons of carbon dioxide per year — roughly two thirds of what people emit.

About half of that sequestration would be cost-effective, meaning enacting the necessary protections would cost less than the consequences of keeping that carbon in the air.

Of the climate solutions they studied, few delivered more carbon bang per buck than mangroves — lush systems of salt-tolerant shrubs and trees that thrive where freshwater rivers spill into the sea. Though these forests occupy just 0.5 percent of the Earth’s shorelines, they account for 10 percent of the coast’s carbon storage capacity.

But the unique ecosystems are too often dismissed as unproductive swamps, good for no one but the mosquitoes. In the past half-century, more than a quarter of the world’s mangroves have been destroyed — drained for development, converted for shrimp farms, poisoned by fertilizer and drowned by dammed-up streams.

Yet the Earth cannot compensate for all of humanity’s pollution, said William Schlesinger, former dean of Duke University’s School of the Environment and a co-author on the 2017 PNAS study. Unless people also reduce the amount of greenhouse gases we emit, no amount of ecological restoration will save us.

“The bottom line is we’ve got to get off of using fossil fuels in transportation and heating and lighting and everything else,”

In public talks, he puts it this way: “It’s easier to patch a hole in a bag than to pick up the marbles that fall out.”

Since the end of the last ice age, the frozen expanse at the top of the world has acted as a protective shield. During the summer, when the sun shines 24 hours a day, Arctic sea ice reflects about two-thirds of the light that hits it back into space. By contrast, the dark open ocean absorbs the majority of the sun’s heat.

If the Arctic loses its perpetual ice cover, it would add half a degree Celsius of warming to the global average temperature, studies suggest. The world is hurtling toward that milestone. Since 1979, the volume of ice left at the end of the summer has shrunk about 75 percent.

There is just one way to save it, she said: by stopping global warming. Only by ending the use of fossil fuels and eliminating greenhouse gas emissions can people prevent the Arctic from heating further and give the ice a chance to recover.

If we do nothing, models indicate, it will be a matter of decades before the summertime Arctic is ice-free for the first time in human history. Sea levels will surge, coastal communities will be deluged, and we will no longer have the planet’s air conditioning unit to help us cool our world down.

Our species evolved and our civilization was built under fairly stable climate conditions. When things changed, they changed slowly, giving us time to adapt.

The rapid transformation of our planet doesn’t just endanger ecosystems; humanity will suffer. People have never lived on a planet without mangroves, or peatlands, or summertime ice. We’ve never had to go without the benefits the Earth provides.

The consequences of losing large numbers of giant sequoias could be felt for decades, forest managers said. Redwood and sequoia forests are among the world's most efficient at removing and storing carbon dioxide in the atmosphere. The groves also provide critical habitat for native wildlife and help protect the watershed that supplies farms and communities on the San Joaquin Valley floor.

Brigham, the study's lead author, cautioned that the numbers are preliminary and the research paper has yet to be peer reviewed.

"I have a vain hope that once we get out on the ground the situation won't be as bad, but that's hope — that's not science," she said.

The newspaper said the extent of the damage to one of the world's most treasured trees is noteworthy because the sequoias themselves are incredibly well adapted to fire. The old-growth trees — some of which are more than 2,000 years old and 250 feet (76 meters) tall — require fire to burst their pine cones and reproduce.

"One-hundred years of fire suppression, combined with climate change-driven hotter droughts, have changed how fires burn in the southern Sierra and that change has been very bad for sequoia," Brigham said.

Sequoia and Kings Canyon have conducted controlled burns since the 1960s, about a thousand acres a year on average. Brigham estimates that the park will need to burn around 30 times that number to get the forest back to a healthy state.

Meanwhile, the economic ramifications of heat waves become clearer every year. In 2017, 120-degree heat grounded flights in Phoenix. In Washington, D.C., and London, train service abruptly halted when tracks melted

According to the International Labour Organization, heat stress is also projected to reduce total working hours worldwide by 2.2 percent by 2030—“a productivity loss equivalent to 80 million full-time jobs.”

The direct physical threat may be most acute in cities, where temperatures on a scorching summer day can vary by as much as 45 degrees from a well-shaded area to one without trees. This is one more way in which poor Americans bear the brunt of broiling temperatures. As noted by the nonprofit American Forests, a map of tree cover in America’s cities is in many cases a map of income and race.

Heat season is upon us. We must acknowledge our risks to manage and survive them, and that process begins by calling the silent killer by its real name.

According to Böhme, the findings suggest that our upright posture can be traced to a common ancestor of humans and great apes that lived in Europe rather than Africa.

The clay pit haul of fossils included teeth, pieces of jaw and spine, and a big toe that would have been handy for grasping tree branches. Arguably the most important fossils were a forearm and shin bone, which informed the scientists’ speculation about how the ape moved around.

The most complete skeleton, with 21 bones, was thought to belong to a male that stood a metre high and weighed about 30kg. He had a broad chest and the curved, S-shaped spine seen in humans.

Some researchers believe dryopithecins were the ancestors of the ancient African apes who ultimately gave rise to great apes more generally, including the gorillas, orangutans, chimpanzees, bonobos and humans.

Writing in the journal Nature, the scientists make the case for danuvius employing what they call “extended limb clambering” to get around. Rather than swinging from branches or walking cautiously on branches, extended limb clambering uses both arms and legs equally.

“Together, the mosaic features of D guggenmosi arguably provide the best model yet of what a common ancestor of humans and African apes might have looked like. It offers something for everyone: the forelimbs suited to life in the trees that all living apes, including humans, still have, and lower limbs suited to extended postures like those used by orangutans during bipedalism in the trees.”

“Danuvius is not a fossil hominin, but it does help inform how humans may have evolved.”

Some of the most compelling evidence for upright walking in human ancestors comes from Ardipithecus ramidus, a female skeleton dating back 4.4m years that was found in Ethiopia. Ardi, who stood about a metre tall, may not have been the most accomplished of walkers, but much of her skeleton shows adaptations to walking on two feet.

That year, the city allocated $1 million of the new tax money for saplings along the 16th Street Mall, the city’s downtown business district, with no funds for poorer neighborhoods with sparse canopies. By the end of 2020, the city will have allocated six times more for trees in downtown areas than in residential zones.

“There’s these tough histories that make it really hard for residents to trust government, to possibly trust nonprofits,” said Kim Yuan-Farrell, executive director of The Park People, a local nonprofit group that advocates for parks and helps organize tree plantings in low-income neighborhoods.However, Ms. Yuan-Farrell said, things seem to be changing.

Growing evidence points to a connection between destructive environmental practices and emerging diseases.

Of more than 330 diseases which emerged between 1940 and 2004, nearly two-thirds were zoonotic, meaning they were transmitted from animals to humans, as with, for example, HIV/AIDS and probably covid-19.

over 70% originated in wildlife,

Replacing old-growth forests with a single crop, such as oil palm, can also lead to the transmission of disease. If predators’ habitats are destroyed and their populations dwindle, other creatures such as rodents, mosquitoes, bats and some primates can proliferate.

scientists are increasingly turning their attention to how altering land interferes with a pathogen’s journey from animals to humans

felling trees increases contact between humans and disease-carrying animals

correlation between the loss of forests in west and central Africa and outbreaks of Ebola between 2004 and 2014

Cutting down trees may also increase the threat to humans posed by viral infections transmitted through mosquito bites, such as Zika, dengue and chikungunya.

link between changes in global forest cover between 1990 and 2016 and an increase in reported epidemics, even accounting for the fact that deforestation usually means more humans living nearby

Wildlife may also move towards human settlements in search of food. Mango trees planted on pig farms in Malaysia probably attracted fruit bats carrying nipah, a virus that infected local pig farmers in 1999 and still breaks out yearly in Bangladesh.

That was a very new idea, this idea of progress. It is not the way most people in history have understood their times. Most ancient peoples either saw history as cyclical or as declining from a past golden age. Nobody thought that humanity’s best years were ahead. Nisbet said that this idea came originally out of Christianity, but then during the Enlightenment it had been secularized.

Instead of seeking to ground that optimism in the fact that God has the future in his hands, we collectively said, “No, we’ve got the future in our hands.” That particular story about the human race, which is a modern and Western story, started to lose altitude in the first part of the 20th century. Although there was a small uptick, it went on life support as decades passed. I would say it’s really dying now.

Mark Lilla has written a couple of interesting books, one on the conservative mind and one on the liberal mind

conservatives have a nostalgia for the past. They feel like things are getting worse. Liberals and progressives have the opposite perspective. They see the past as being horrible. They think our hope is in the future. Even Lilla, who is not a believer, noted that Christianity had a different story than either. He observed that Saint Augustine’s book The City of God rejected both conservative and liberal perspectives.

Augustine believed that “the city of man” is bad and “the city of God” is good, and that eventually the city of God is going to supplant the city of man. He said you cannot identify any particular political order or any particular city of man with the city of God, and that our true hope lies in the new heavens and earth of the future. That gets rid of the conservative idea that that everything in the past was better and there is no hope. However, it also gets rid of the liberal idea that if we all just pull ourselves together we can bring about the city of God on earth. It gives us a chastened hope for the future rather than a utopian one.

Steven Pinker, a Harvard psychologist, observes that empirically we are living healthier and longer lives. Nevertheless, people feel more culturally and emotionally dislocated than ever. Younger generations are experiencing far more depression and anxiety than those that came before them. We can feel the cultural anxiety today. There’s a real pessimism about the future that I’ve not seen in my lifetime. We find ourselves in a new age of anxiety.

The gospel creates virtues in Christians. If Christians multiply in the culture, we can work for a more just society. And even if we do not immediately bring about a perfectly just society, we have the hope that eventually that’s going to be established on earth by God.

We do not have to become the darkness to bring this about. We do not have to say, “Well, we have to break eggs to make an omelet.” We do not have to trample on people because we think that is our only hope for a better world. It is not

We can remain faithful in our hope, even if it means that we ourselves do not necessarily see the immediate success we want. To be hopeful means to do what we are supposed to do because our eventual prospects are certain.

In English, hope can mean the opposite of the biblical sense—to be uncertain. If you say, “I know it’s going to happen,” that is certainty. If you say, “I hope it will happen,” that is uncertainty

My son Jonathan is an urban planner. In his mind, he has all these exciting ideas about what a great city would look like. Well, as a Christian, he realizes that in his entire life he may only get one “leaf” done of his beautiful vision. We all face that reality. Nevertheless, we live with the hope that there will be a tree. There will be a city. There is going to be a just society. Beauty will be here. Poverty and war will be gone. We are not the saviors. Instead, hope can set us free from both the despair of nihilism and the naivety of utopianism.

The word hope in English has declined in meaning. We use it as if it were a pleasant wish. What you are describing, like the Bible’s definition, is obviously richer.

We have a translation problem. Like the word shalom, which is usually translated into English as “peace.

There is a famous short story by J.R.R. Tolkien called “Leaf by Niggle.” Niggle is a painter who spends his entire life trying to paint a mural of a tree. By the end of his life, he has only gotten one leaf completed. Then he dies. But when he gets to heaven, he sees the tree that was always there in his mind. That is the way of the Christian

The Greek word elpis means assurance of the future—assured anticipation. You are sure of your hope. Quite the opposite of how we typically use the word in English.

Eventually everybody will get to the place where it matters personally whether the resurrection of Jesus Christ really happened. Because if it did, then there is hope for you, no matter what happens

I did not want to try to redo what N.T. Wright did. He wrote what is in my opinion the best book on the resurrection in the last 100 years, The Resurrection of the Son of God. He traces significant evidence that the resurrection accounts were not merely made up. They have all the marks of historic eyewitness testimony—including bizarre details no one would include in a fictional account.

Wright said there were only two ways that people had ever thought of resurrection before Jesus. The first was as resuscitation—like Lazarus. The person was dead, then something miraculous happens and he gets up out of the tomb, in which case you recognize him because he still looks the same, right? The second idea of resurrection is of the transformation of the person into an angelic or radiant being. But the idea that Jesus Christ was raised from the dead as recognizable, yet somehow different from the way he had looked before his death (so much so that even his closest friends didn’t at first recognize him) is so utterly counterintuitive. No one would have made that up.

Why does the resurrection matter? Well, as one reason among billions, because I have cancer. Because one of the things you do when you have cancer is ask how you are going to deal with it. That experience has required that I increase my hope, by reading the Word, especially on the resurrection of Jesus. Because if he were raised from the dead, then basically, it is going to be OK. If he were raised from the dead, then Christianity is basically right, and the hope it gives is an infallible hope.

as a mortal person facing his own death, the resurrection brings perspective to our theology. At this stage in my life, I am looking at the big things of which I can be sure

when it comes to the resurrection? If I am sure of that, then I am OK. I can handle anything that life—or death—throws at me.

As the 57th AIDS patient to reach the CDC team’s attention, Dugas was originally billed as Case 057. But since he came from outside California, and wasn’t even a U.S. resident, the investigators started referring to him offhandedly as the “Out-of-California patient”—or “Patient O” for short.

The CDC team did their best to naysay this misconception, but it gained steam globally in 1987, after the journalist Randy Shilts published his bestselling book And The Band Played On.

The idea fit with the prejudices of the day: Here was a modern Typhoid Mary, whose homosexuality and irresponsible promiscuity had brought a plague to American shores.

He sequenced the complete genomes of HIV taken from U.S. samples collected in the late 1970s, and showed that Dugas could not possibly have been the first AIDS patient in the U.S. Indeed, the disease likely entered the country from Haiti in 1971, flying under the radar for a decade before anyone realized what was happening.

HIV first started infecting humans somewhere in West Africa, having jumped into us from chimpanzees.

He also concluded that the virus must have arrived in the U.S. around 12 years before AIDS was formally recognized in 1981.

They reveal that HIV had spread from Africa to the Caribbean by around 1967, and had jumped into the U.S. by around 1971. It landed in New York City and began diversifying rapidly

By the time anyone noticed the first sign of AIDS in 1981, the virus had already hopped from coast to coast, and become genetically diverse.

This means that not only did Dugas not bring AIDS to America, but he didn’t spread it west either. He was a totally mundane part of a very unusual epidemic.

In 2010, evolutionary biologists used gene trees to prove that a man named Anthony Eugene Whitfield had knowingly infected many women with HIV. More recently, biologists used a pocket-sized DNA sequencer to track the evolution of Ebola in real-time, providing details about routes of transmission that helped to curtail the recent west African outbreak.

About 4,000 years ago, people started burning the forest, which was mostly bamboo, just enough to make small openings. They may have planted maize or squash, weeded out some underbrush, and transported seeds or saplings to create a partly curated forest of useful tree products that Dr. Watling calls a “prehistoric supermarket.” After that, they started building the geoglyphs. The presence of just a few artifacts, and the layout of the earthworks, suggest they weren’t used as ancient villages or for military defenses. They were likely built for rituals, some archaeologists suspect.

in contrast with the large-scale deforestation we see today — which threatens about 20 percent of the largest rain forest in the world — ancient indigenous people of the Amazon practiced something more akin to what we now call agroforestry. They restricted burns to site locations and maintained the surrounding landscape, creating small, temporary clearings in the bamboo and promoting the growth of plants like palm, cedar and Brazil nut that were, and still are, useful commodities. Today, indigenous groups around the world continue these sustainable practices in forests.

unusually high-resolution analysis of pollen grains taken from sediment beneath the Sea of Galilee and the western shore of the Dead Sea, backed up by a robust chronology of radiocarbon dating, have pinpointed the period of crisis to the years 1250 to 1100 B.C.

this pollen count was done at intervals of 40 years — the highest resolution yet in this region,

the uniqueness of the study also lay in the combination of precise science and archaeological and historical analysis, offering the fullest picture yet of the collapse of civilization in this area at the end of the Bronze Age. “Egypt is gone. Forever,” said Professor Finkelstein. “It never got back to that level of prosperity again.”

the team extracted about 60 feet of cores of gray muddy sediment from the center of the Sea of Galilee in northern Israel, passing through 145 feet of water and drilling 65 feet into the lake bed, covering the last 9,000 years. At Wadi Zeelim in the southern Judean Desert, on the western margins of the Dead Sea, the team manually extracted eight cores of sediment, each about 20 inches long.

Pollen grains are one of the most durable organic materials in nature, she said, best preserved in lakes and deserts and lasting thousands of years. Each plant produces its own distinct pollen form, like a fingerprint. Extracting and analyzing the pollen grains from each stratum allows researchers to identify the vegetation that grew in the area and to reconstruct climate changes.

The results showed a sharp decrease in the Late Bronze Age of Mediterranean trees like oaks, pines and carobs, and in the local cultivation of olive trees, which the experts interpret as the consequence of repeated periods of drought.

The droughts were likely exacerbated by cold spells, the study said, causing famine and the movement of marauders from north to south. After the devastation came a wet period of recovery and resettlement, according to the experts — a new order that gave rise to the kingdoms of biblical times.

over the past 40 years or so we have gone from a culture that reminds people of their own limitations to a culture that encourages people to think highly of themselves. The nation’s founders had a modest but realistic opinion of themselves and of the voters. They erected all sorts of institutional and social restraints to protect Americans from themselves.

over the past few decades, people have lost a sense of their own sinfulness. Children are raised amid a chorus of applause. Politics has become less about institutional restraint and more about giving voters whatever they want at that second.

Reinhold Niebuhr put it best: “Nothing that is worth doing can be achieved in our lifetime; therefore, we must be saved by hope. ... Nothing we do, however virtuous, can be accomplished alone; therefore, we are saved by love. No virtuous act is quite as virtuous from the standpoint of our friend or foe as it is from our standpoint. Therefore, we must be saved by the final form of love, which is forgiveness.”

The Academy survived for a few more centuries until it was destroyed by the Roman general Sulla in 87 B.C.E. during the sack of Athens. The buildings were probably burned along with many other sanctuaries, and the trees from the grove of academe were felled to provide timber for his siege machines. So it goes, I thought.

The ban is the latest project in Prime Minister Imran Khan’s green initiative, which began last year with a campaign to plant 10 billion trees to fight deforestation.

Today, more than 40 countries have either banned or taxed single-use plastic bags

“The Kenyans told us a sudden ban is easier to enforce than trying to collect a tax or fee, because there is no incentive to bribe,”

The fines in Pakistan will also be steep — $31 for using a single bag, $63 for selling one and up to $31,000 for manufacturing them. The national per capita income is $1,200 per year

Shoppers are not likely to be aggressively pursued, but companies that make and supply the bags have been warned that they will be inspected to enforce the ban.

To encourage customers to obey the law, officials have introduced colorful cloth tote bags, which they have distributed at weekend markets

“We cannot bring change through force,” one federal capital commissioner posted on social media. “Our slight change in habits will do miracles for future generations.”

“This is a good step and I support it. People don’t realize how dangerous these bags are for our health,” said Ali Muhammad, 27, who runs a small grocery store

“I’m already losing money because no one wants to buy plastic now,” said Qasim Khan, 26, a scrap dealer who usually buys bulk plastic for pennies a pound and sells it for a little more. “But I’m happy this new law will get rid of all the filth in the gutters. That will be good for everyone.

there is no sign of flying long-haul on an electric plane any time soon.

The answer to this is to remove carbon dioxide from the atmosphere, using “negative emissions technologies”

How can it be done? The UK is betting on bioenergy with carbon capture and storage, BECCS, where carbon is removed from the atmosphere by crops or trees as they grow. This biomass is then burned in a power station to generate electricity, and the waste carbon dioxide is pumped far underground

A second approach is to restore or enhance processes that naturally remove carbon dioxide from the atmospher

orest restoration removes carbon by storing it in trees, and soils can also take up carbon, for example, if crushed silicate rocks are spread on to them, enhancing a natural chemical process

Politicians and their advisers love them, because they can announce a target such as 1.5C while planning to exceed it, with temperatures hopefully clawed back later in the century through negative emissions.

The greater the negative emissions, the less decarbonisation is needed. Negative emissions technologies are deployed as a weapon to avoid taking serious action on climate.

Most scenarios have more than 730bn tonnes of carbon dioxide sequestered as negative emissions this century. That is equivalent to all the carbon dioxide emitted since the industrial revolution by the US, the UK, Germany and China combined. There just isn’t enough land to suck up that much carbon into new forests

using BECCS to remove this much carbon, as most scenarios assume, would require an area of new cropland larger than India, plus building a facility to store 1m tonnes of carbon a year every single day from 2025 until 2050. Negative emissions at this scale are the stuff of fantasy.

“The window of opportunity is still there, but the window of opportunity is narrowing,” WHO Director General Tedros Adhanom Ghebreyesus said on Friday. “We need to act quickly before it closes completely.”

At the beginning of any disease outbreak, public health experts painstakingly trace the contacts of every person who becomes sick. The experts build a family tree of possible illness, with branches that include anyone who might have shaken hands with, or been sneezed on by an infected person

with confirmed infections approaching 80,000 people, contact tracing on a case-by-case basis could soon be impractical.

“What we find is that this virus is going to be very difficult to contain,” said Jeffrey Shaman, an infectious disease researcher at Columbia University and co-author of the study posted Monday. “Personally, I don’t think we can do it.”

The word ‘pandemic’ invokes fear, but it describes how widespread an outbreak may be, not its deadliness.

“I think we should assume that this virus is very soon going to be spreading in communities here, if it isn’t already, and despite aggressive actions, we should be putting more efforts to mitigate impacts,”

The virus would be easier to contain if people who are contagious were obviously so, as was the case with SARS, which started an outbreak that burned itself out in 2003. But the new virus appears to spread among people who in some cases are not noticeably sick.

among the more than 600 passengers from the Diamond Princess cruise ship who have tested positive, about half had no obvious symptoms.

If the coronavirus becomes a true pandemic, a large proportion of the human population — a third, a half, two-thirds even — could become infected

Harvard epidemiologist Marc Lipsitch estimates that 40 to 70 percent of the human population could potentially be infected by the virus if it becomes pandemic. Not all of those people would get sick

The novel coronavirus may be particularly suited for stealth community transmission since its symptoms can be indistinguishable from those of a cold or flu, and testing capabilities are still being ramped up.

Experts estimate it takes about a week for the number of people infected in a given community to double. Based on that, it would likely take several weeks for a new infection cluster to be picked up by a local health department

By mid-March, he estimated, officials should know if there is community transmission and a true pandemic.

“I want to be clear that we are not seeing community spread here in the United States yet,” she said Friday. “But it’s very possible, even likely, that may eventually happen.”

“If a large number of countries are unsuccessful in preventing sustained multi-generation transmissions, then we could witness the next pandemic.”

A pandemic is a line in the sand, and every expert has a slightly different definition for when an outbreak crosses it. Generally, it means that there are self-sustaining lines of infection in multiple countries and continents — where the family tree of possible illness begins to encompass the entire population.

I think we’re not in as dire straits as we might be, and that’s because everyone is pulling together internationally.”

Public health experts are devising strategies on how to conserve N95 respirators, specialized masks that are in a limited supply amid surging demand.

“Extrapolating from some of the numbers we’ve seen on the impact to the health care system in China, it means we’ll have to surge fast.”