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Anton Petrus / Moment / Getty Images

By Jordan Davidson

The climate crisis has us spiraling towards higher temperatures while also knocking out marine life and insect species at an alarming rate that continues to accelerate. But, just how long will it take Earth to recover? A new study offers a sobering answer: millions of years.

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A comet may have brought the mammoths to extinction. Royal Tyrell Museum in Drumheller, Alberta / Dave Smith / Flickr

By Tim Radford

Think of it as the day a comet set the earth on fire. Researchers have evidence of widespread and devastating forest fires around half the world—a blaze to blot out the light of the sun—and all of it at a geological boundary called the Younger Dryas, 13,500 years ago.

The evidence, they say, supports the hypothesis that planet Earth sailed through a cloud of shattered cometary dust and stones, and the atmospheric violence that followed was enough to set light to accumulated forest timber, peat and grasses across the Americas, Europe and western Asia.

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