Ancient Climate-Change Event Puzzles Scientists

Carbon dioxide (CO2) gets a bad rep for contributing to global warming, and deservedly so. But scientists say they can't entirely blame the greenhouse gas for a curious spike in Earth's temperature 55 million years ago. New research reveals that something else also seems to have warmed the planet during that time, though no one's quite sure what it was.

Full story by Phil Berardelli on ScienceNOW



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