Carbon Dioxide Role In Past Climate Revealed

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Report in a leading Earth Science journal, Geochemistry Geophysics Geosystems

Cambridge, UK Researchers at the British Antarctic Survey (BAS) and the University of California, Santa Cruz have discovered that Earths last great global warming period, 3 million years ago, may have been caused by levels of CO2 in the atmosphere similar to todays.

"If the warming was caused by ocean currents, we would expect to see cooling at the tropics and warming at the poles. Conversely, if CO2 was the cause then we would expect both the tropics and the poles to warm.
The sea temperature pattern we found points the finger squarely at CO2 rather than the ocean currents. "