In this two minute excerpt, Dr. Patrick Moore — ecologist, Greenpeace founder, and current chair of the CO2 Coaliton — explains that CO2 is an essential and powerful plant food and a minor greenhouse gas, but not the primary driver of global temperature that computer models assume it to be.

On the huge swings in the earth’s temperature on geological time scales, Dr. Moore says: “There is no historical evidence that CO2 causes the temperature to change, none whatsoever.”