3.2-Million-Year Temperature History from Tiny Fossils
Wednesday, August 5, 2009 - 14:56
in Earth & Climate
(PhysOrg.com) -- People often talk about greenhouse gases and their effect on the earth's climate as if those effects were new. But greenhouse gases have been around for hundreds of millennia, playing a key role in the start of the ice ages in the Northern Hemisphere 2.72 million years ago.