Article,

Palaeoclimate: Global warmth with little extra CO2

, and .
Nature Geoscience, 3 (1): 6--7 (Dec 20, 2009)
DOI: 10.1038/ngeo736

Abstract

In the Early Pliocene, three to five million years ago, global temperatures were about 3–4|deg| C warmer than today in the low latitudes, and up to 10|deg| C warmer nearer the poles. Climate simulations and reconstructions of this relatively recent period (geologically speaking) may help constrain realistic magnitudes of future warming.

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