From the Amazon to central Africa, forests are burning. In late August, for example, Brazil’s National Institute for Space Research said that the number of fires in the country—largely set by humans—had jumped 84% this year over the same period in 2018. The amount of Amazon forest cover lost in Brazil in that span spiked 39%. Last year, according to Global Forest Watch, the tropics overall lost some 8.9 million acres of primary rain forest—an area equal to the size of Belgium. But not just rain forests are aflame: Greenpeace estimates that massive blazes in Siberia this year have released more than 166 metric tons of CO2, nearly equal to the annual emissions of 36 million cars.