Note to moron “deniers”: The fact they’re drilling for oil under the Arctic proves there were once green plants there, a few million years ago (and millions of years before the Earth existed according to creationists who make up a large segment of the deniers). Tectonic plate movements had more to do with the change than CO2 levels. Today, it IS the CO2, and other HUMAN changes, like massive agricultural clearing of rain forests, destruction of plains grasslands, and other changes to biological as well as “chemical” components in the environment that are causing change.
Humans haven’t moved many continents lately, but they have destroyed a good many of the life forms on them, and are increasing the rate of destruction. (Including increasing storm intensities.)