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Flames are spreading across the Amazon rainforest this summer, spewing millions of tons of carbon dioxide into the atmosphere each day. But scientists say that’s not their biggest concern. They’re far more worried about what the fires represent: a dramatic increase in illegal deforestation that could deprive the world of a critical buffer against climate change.

More than a soccer field’s worth of Amazon forest is falling every minute, according to Brazil’s National Institute for Space Research, known as INPE. Preliminary estimates from satellite data revealed that deforestation in June rose almost 90% compared with the same month last year, and by 280% in July.

The Amazon is a key component of Earth’s climate system. It holds about a quarter as much carbon as the entire atmosphere and single-handedly absorbs about 5% of all the CO2 we emit each year.

But if such rapid deforestation continues, it will foil efforts to keep global temperatures in check. Scientists fear parts of the Amazon could pass a critical threshold and transform from a lush rainforest into a dry, woody grassland. And that could bring catastrophic consequences not only for people in South America, but also for everyone around the world.

“We might be very, very close to the tipping point,” said Carlos Nobre, a climate scientist at the University of Sao Paulo in Brazil. And if we cross it, he said, “it’s irreversible.”

The trend is particularly alarming because it comes after more than a decade of progress toward preserving the world’s largest rainforest. Many blame the anti-environmental rhetoric of Jair Bolsonaro, Brazil’s new far-right president, and fear that it will put global climate efforts in jeopardy.

The Group of Seven nations on Monday pledged tens of millions of dollars to help Amazon countries fight raging wildfires, even as Bolsonaro accused rich countries of treating the region like a “colony.”

The international pledges at a G-7 summit in France included $20 million from the group, as well as a separate $12 million from Britain and $11 million from Canada. Ottawa has also offered to send firefighting planes to Brazil.

Other groups are contributing support for a region whose rainforests are a major absorber of carbon dioxide from the atmosphere. Earth Alliance, a new environmental foundation backed by Leonardo DiCaprio, is pledging $5 million in aid, saying the Amazon is one of the “best defenses” against climate change.

The funds are widely seen as critical support, but a relatively small amount for dealing with an environmental crisis of such scale, and it was unclear how exactly the money would be administered on the ground. Brazil’s environment minister, Ricardo Salles, said the aid was welcome and that Brazil should decide how the resources are used.

The international pledges came despite tensions between European countries and the Brazilian president, who suggested the West was angling to exploit Brazil’s natural resources.

“Look, does anyone help anyone … without something in return? What have they wanted there for so long?” he said to journalists outside the presidential palace.

Bolsonaro has insulted adversaries and allies, disparaged women, black and gay people, and even praised his country’s 1964-1985 dictatorship. But nothing has rallied more anger at home and criticism from abroad than his response to the fires raging in parts of the Amazon region.

Left to nature, the Amazon rarely burns. But INPE has counted more than 25,000 blazes in the Amazon in August alone. The smoke grew so thick it cast the city of Sao Paulo, which lies more than 1,000 miles away, into daytime darkness.

The fires came as no surprise to those who keep a close watch on the Amazon. Satellite images in May, June and July showed an uptick in deforestation. It was only a matter of time before the flames followed, said Doug Morton, chief of the Biospheric Sciences Laboratory at NASA’s Goddard Space Flight Center.

“This is the expected one-two punch,” he said.

Instead of axes and machetes, people now use bulldozers and giant tractors with chains to pull down the Amazon’s towering trees. A few months later, they torch the trunks. It’s the only realistic way to remove such huge amounts of biomass, Morton said. “It’s slash and burn, 21st century.”

This marks a troubling reversal in the fight to end deforestation, long a linchpin of global climate policy.

In 2004, the Brazilian government began cracking down on forest destruction by designating more protected areas and reserves for indigenous people. Violators were fined or arrested and forest loss declined 75% by 2012.

What’s more, the country’s agricultural production continued to increase, demonstrating that development and conservation could go hand in hand, said Nobre, who has been studying the Amazon for more than 35 years.

“It was a big success,” he said. “Everybody was happy.”

However, deforestation rates have increased sharply since May, a few months after Bolsonaro took office. So far, more than 2,000 square miles of forest have fallen this year.

Bolsonaro has railed against protections for indigenous land and promised to boost the country’s economy. He has also weakened the government’s capacity for oversight and indicated he would not go after farmers, loggers and miners who seize and clear forest.

President Donald Trump’s trade war may also play a role by making Brazil a leading supplier of China’s soybeans. “This is, to some extent, driven by global demand for commodities, because that’s what potentially gives the land value to farmers and ranchers,” said ecologist Oliver Phillips of the University of Leeds in the U.K.

Bolsonaro has called INPE’s deforestation figures a “lie” and recently fired the agency’s director. He has also claimed, without evidence, that environmental groups started the fires to embarrass his administration.

But scientists said there’s no question that the blazes are linked to deforestation. The burns are clustered near roads along the so-called arc of deforestation, and they line up with the areas of greatest land clearing earlier in the year, Morton said. The power of the fires also betrays their origins.

“Big towering columns of smoke need a big fire beneath them,” he said. This is not farmers burning fields or clearing overgrown pastures. “This is burning enormous piles of wood.”

And it’s not over yet. It’s common to let felled trees dry before burning them, so the spike of deforestation that INPE recorded in July will bring more fires in September, Alencar said: “We still have two months to go.”

The fires — and the deforestation behind them — are an immediate concern for global warming. Already, Brazil’s blazes have released 200 million tons of CO2 into the atmosphere — about three times as much as all of the wildfires in California last year, according to Europe’s Copernicus Atmosphere Monitoring Service.

Aragao estimates that by the end of the year, greenhouse gas emissions will be similar to those in 2009, when clearing and burning the Brazilian Amazon released about 500 million tons of CO2. That’s equivalent to roughly 1% of the world’s total emissions in a year.

Much more worrying than the fires themselves is the perilous state of the Amazon, scientists said.

Climate models suggest that the combined effects of deforestation and global warming could push the Amazon past a critical tipping point and turn two-thirds of the rainforest into a kind of degraded savanna, Nobre said.

The ultimate fate of the Amazon is still up for debate. “This is a huge question lots of people are trying to answer,” Swann said.

If scientists’ worst fears come to pass, it could become all but impossible to meet global climate goals aimed at limiting the worst effects of global warming.

The Amazon plays a key role in offsetting our emissions and sequestering carbon. But already, climate change has suppressed the forest’s ability to suck up CO2 by one-third, and in the worst years, fires release about as much carbon as the forest traps. Now, Nobre and others fear that if large swaths of the forest transform, about 50 billion tons of stored carbon — roughly 10 times the world’s annual emissions — could escape.

Damage to the Amazon could reduce its powerful cooling effects too. When water evaporates from tree leaves, it removes heat from the atmosphere. As a result, tropical forests act like giant air conditioners, both locally and globally. According to one analysis, protected forests in the Brazilian state of Mato Grosso were 5.4 degrees Fahrenheit lower than surrounding pastures and farms.

There’s also the potential for changes in the Amazon rainfall to disrupt weather patterns around the world. One study found that deforestation of the Amazon would affect precipitation in North America, including in California and the Midwest.

Associated Press contributed.

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