O CO2 tem importância (como se fosse necessário dizê-lo de novo...)

Getting Warmer? Prehistoric Climate Can Help Forecast Future Changes

ScienceDaily (2008-11-25) -- New data on a prehistoric warm period allow for more accurate predictions of future climate and improved understanding of today's warming. Past warm periods provide real data on climate change and are natural laboratories for understanding the global climate system. Scientists examined fossils from 3.3 to 3.0 million years ago, known as the mid-Pliocene warm period. ... > read full article