Bottom Line: Ocean Floor Sediments May Be Window on World's Warmer Future

Scientific American: Digging into our planet's past could help us prepare for a hot future. One dramatic spike in historical temperatures, the Paleocene–Eocene Thermal Maximum (PETM), occurred around 55.9 million years ago. That time was marked by changes in ocean productivity, the water cycle, ocean acidification and land animal migrations. Now a new study by researchers in the U.K. confirms the ocean held less dissolved oxygen. Similarly, low oxygen zones caused by modern climate change threaten marine life and humans...

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