CMojo...right you are...but you forgot about the dust kicked up by the huge asteroid Nostradomus predicted for 2014!
On a more serious note...there ARE things man does that can change the earth and environment. It is important that we understand those processes and clean up our messes and reduce or eliminate the underlying causes.
So...my position is not that man CAN'T change the climate...just that CO2 released by man is not doing it...or at least to any significant or detrimental effect.