In 1980 Mount St. Helens [alone] spewed more CO2 into the atmosphere than did all the world's automobiles since day 1. Global warming cycles [and ice ages] in the past 4.5 billion years are real happenings, but it hasn't been, nor is it now a man made phenomena. We've only been around the last 1.3 million years. The "carbon footprint" generated by humans is so infinitesimal, that to try to quantify it would be like dabbling in useless information.
