Ocean bacteria may have shut off ancient global warming

Mineral spikes in sea-floor sediments coincide with halt in temperature rise

WARMER WORLD  The amount of carbon-containing matter falling to the deep ocean increased during an extraordinarily warm period around 56 million years ago, researchers argue. In this computer simulation of the oceans at the time, red indicates high levels of falling carbon-rich material and green indicates low amounts. 

Z. Ma et al/Nature Geoscience 2014

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