| http://www.w3.org/ns/prov#value | - But greenhouse gases such as methane and carbon dioxide played an important role at this time, warming the planet to a point where it was habitable for life. ???The problem was, the Sun was fainter and the energy input to the atmosphere was reduced,??? said J. Lee Grenfell, an atmospheric chemist at the Technische Universit??t Berlin in Germany and lead author of the study recently featured in the
|
