>What is happening now is going to be completely outside the climate that >has existed over those three million years. The level of CO2 alone is >already 100 ppm above the natural high and continues to increase at a >rate of 2 ppm per year minimum....a rate that takes nature almost 1000 >years to replicate. Atmospheric temperatures are following.
Well, if you go back 250 million years, you see a CO2 rise as fast as it does now. One theory is that a megavolcano burying Siberia lit off a bunch of coal fields, and both the volcano and the coal fields sent the CO2 sky-high.
Of course that event is commonly called "The Great Dying." -- We are geeks. Resistance is voltage over current.