Climate record from bottom of Russian lake shows Arctic was warmer millions of years ago

The Arctic was very warm during a period roughly 3.5 to 2 million years ago — a time when research suggests that the level of carbon dioxide in the atmosphere was roughly comparable to today’s — leading to the conclusion that relatively small fluctuations in carbon dioxide levels can have a major influence on Arctic climate, according to a new analysis of the longest terrestrial sediment core ever collected in the Arctic.

Fuente : http://www.eurekalert.org/pub_releases/2013-05/nsf…