photo: Alejandro Cañizares via flickr New research published in the journal Nature Geoscience shows that during Paleocene-Eocene Thermal Maximum , a period about 55 million years ago when the planet warmed rapidly, only about 40% of that warming can be attributed to rises in CO2 in
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CO2 Increases Responsible for Only 40% of Ancient Warming - Could the World Get Even Hotter Than Models Predict?