The Fern That Cooled the Planet  Over its lifetime, the Earth…

The Fern That Cooled the Planet 

Over its lifetime, the Earth has seen plenty of climate change. About 50 million years ago the planet experienced extreme cooling, and all from a little fern.

Hosted by: Hank Green

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By: SciShow.
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The Fern That Cooled the Planet  Over its lifetime, the Earth…

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