Around 56 million years ago there was a period of global warming called the Paleocene-Eocene Thermal Maximum (PETM), during which global sea surface temperatures increased by approximately 5°C.Fossil coral reefs in Spitzbergen were identified a long while ago, and can't be attributed to continental drift under any existing scenario.
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A damn fern pushed us into our current semi ice age....we need more CO in the atmosphere so we can get back to normal...
Note: this topic is from 2/27/2011. Thanks Ernest.