For a great discussion of the CO2 myth and AGW, go here:
http://www.skepticalscience.com/human-co2-smaller-than-natural-emissions.htm
Sorry but that site, “skeptical” science, is complete crap. In fact the say your point (CO2 being a tiny percentage of CO2) is a “myth”. Do not go there or link there any more, it will rot your brain.