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https://www.sciencedaily.com/releases/2017/09/170920182116.htm Coral bleaching. Credit: © Richard Carey / Fotolia In the past 540 million years, the Earth has endured five mass extinction events, each involving processes that upended the normal cycling of carbon through the atmosphere and oceans. These globally fatal perturbations in carbon each unfolded over thousands to millions of years, and are coincident with the widespread extermination of marine species around the world. The question for many scientists is whether the carbon cycle
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