Abstract
CLIMATE CHANGEPaleoceanographers are closing in on a possible cause for the evolutionary watershed 55 million years ago that brought modern mammals into global dominance: a vast belch of climate-changing from under the sea floor. Proposed less than 5 years ago, the methane burp hypothesis gets its most direct support yet on page [1531][1] of this issue of Science . Paleoceanographers have discovered a sequence of sediment layers buried half a kilometer below the sea floor off Florida, which records the exact sequence of deep-sea changes--including vast submarine landslides--predicted by the scenario. [1]: http://www.sciencemag.org/cgi/content/short/286/5444/1531
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