Global warming due to CO2 is a hoax. If there was no CO2 there would be NO PLANT life on Earth. The Earth warms and cools on a 27 year cycle. This was proven by extensive ice cores taken in Greenland, which when discovered by the Vikings was actually GREEN due to being covered by Grass. Another fact, the termites on Earth produce 20 times the amount of CO2 produced by everything that man does to produce it.