Climatic Chain Reaction Caused Runaway Greenhouse Effect 55 Million Years Ago
Excerpt:
"Analogous to the Earth's current situation, greenhouse warming 55 million years ago was caused by a relatively rapid increase of CO2 concentrations in the atmosphere. This phase, known as the Paleocene-Eocene thermal maximum (PETM), was studied using sediments that accumulated 55 million years ago on the ocean floor in what is now New Jersey."
http://www.sciencedaily.com/releases/2007/12/071221222544.htm
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