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May 10, 2011 06:18 AM ET
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Feb 24, 2010 08:26 PM ET
An epoch of ancient time known as the early Pliocene 3-5 million years ago holds special fascination for climate scientists, because levels of carbon dioxide in the atmosphere were about as high as they are in modern climate. What puzzles researchers is why, even though conditions such as sunlight, geography, and CO2 concentrations were much [...]
Feb 21, 2010 01:13 PM ET
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