How the fires look from space. Photo: Joshua Stevens/NASA Earth Observatory/Facebook

The Amazon rainforest has been ravaged by hundreds of fires for the past 3 weeks, and the Brazilian government has deployed 44,000 troops to battle the blazes.

Why it matters: World leaders at the G7 summit have pledged a $20 million aid package to help affected South American countries fight the blazes. The BBC notes that from 1980 to 2010, the rainforest's trees are estimated to have pulled in carbon dioxide equivalent to the fossil fuel emissions of most of the 9 countries that own or border it.

Forest is cleared with fire in the surroundings of Boca do Acre, a city in Amazonas state, in the Amazon basin in northwestern Brazil, Aug. 24. Photo: Lula Sampaio/AFP/Getty Images
A farm worker in Nova Santa Helena municipality in northern Mato Grosso state, south of the Amazon basin in Brazil, Aug. 23. Photo: Joao Laet/AFP/Getty Images
Burned areas of the Amazon near Boca do Acre, in the Amazon basin, Brazil, Aug. 24. Photo: Lula Sampaio/AFP/Getty Images
Fire in the Amazon rainforest, near Abuna, Rondonia state, Brazil, Aug. 24. Photo: Carl de Souza/AFP/Getty Images
Cattle graze near a burned area of the Amazon near Novo Progresso, Para state, Brazil, Aug. 25. Photo: Joao Laet/AFP/Getty Images
Fire burns out of control at a farm in Nova Santa Helena, northern Mato Grosso state, in the Amazon basin, Brazil, Aug. 23. Photo: Joao Laet/AFP/Getty Images

Go deeper: Earth's lungs are burning

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Updated 20 mins ago - Science

Isaias strengthens as it crawls toward the Carolinas

A wave crashes ashore as Tropical Storm Isaias passes through Jetty Park in Fort Pierce, Florida, on Sunday. Photo: Joe Raedle/Getty Images

Tropical Storm Isaias is expected to reach the Carolinas late Monday at "near hurricane strength," the National Hurricane Center (NHC) said.

The latest: Isaias was 65 miles northeast of Cape Canaveral with winds increasing to 70 mph, the NHC said in a 2 a.m. update. Storm surge warnings and hurricane watches were in effect for North and South Carolina and Rhode Island. Tropical storm watches were in effect for Florida, Long Island and Delaware.

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Coronavirus dashboard

Illustration: Sarah Grillo/Axios

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World coronavirus updates: Global cases top 18 million

Data: The Center for Systems Science and Engineering at Johns Hopkins; Map: Axios Visuals

The number of novel coronavirus cases surged past 18 million globally on Sunday night, Johns Hopkins data shows.

By the numbers: More than 688,300 people have died from COVID-19 worldwide. Over 10.6 million have recovered.