World Matter: The Planet Has Seen Sudden Warming Before. It Wiped Out Almost Everything. December 7, 2018December 7, 2018CARL ZIMMERComments Off on Matter: The Planet Has Seen Sudden Warming Before. It Wiped Out Almost Everything. In some ways, the planet's worst mass extinction — 250 million years ago, at the end of the Permian Period — may parallel climate change today.
