This may sound good on the surface, but it may not hold water in the long run. For instance, we breath oxygen so you could assume that oxygen is not harmful. But, breathing 100% oxygen is harmful and can even be fatal.
Cousin?
Since CO2 is only 0.0383% of the atmosphere, and man's increase is only a fraction of that fraction, the implication is obvious.
Michael Snow
mikesnow.org
Here is an excellent summary of this issue and why so many people have jumped on a bandwagon going nowhere.
It is written by a world-renouned climatologist from MIT:
http://www.heartland.org/events/newyork09/pdfs/lindzen.pdf