The carbon cycle before humans: New studies provide clearer picture of how carbon cycle was dramatically affected long ago

This item was filled under Climate
Two new studies contribute new clues as to what drove large-scale changes to the carbon cycle nearly 100 million years ago. Both research teams conclude that a massive amount of volcanic activity introduced carbon dioxide and sulfur into the atmosphere, which in turn had a significant impact on the carbon cycle, oxygen levels in the oceans and marine plants and animals. Oxygen levels dropped so low that one-third of marine life died....
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