Coal Almost Turned Earth into a Giant Ball of Ice

Coal, it’s the sooty fossil fuel that’s heated our homes and generated electricity for centuries, but millions of years ago its formation could’ve frozen the planet.

Coal deposits formed from dead trees and plants roughly 300 million years ago during the late Carboniferous and early Permian periods. During that timeframe, Earth was largely a hot, sticky planet covered in swampy jungles. Levels of CO2 reached 1,000 ppm, which is more than twice the levels they are today. But as the climate

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