Global warming led to ancient mass extinction event, scientists say.

Global warming led to ancient mass extinction event, scientists say.

According to new research, a rise of greenhouse gases 250 million years ago led to the disappearance of most life on Earth. CBS News meteorologist and climate specialist Jeff Berardelli spoke to Brock University geochemist Dr. Uwe Brand to find out why scientists are linking the Great Dying to climate change impacts today.

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