When talking about CO2 it afaik would be wrong to think that it all would go into the atmosphere. I liked a comment from a farmer who said that before CO2 became a global warming nightmare it was just a gas that crawled on the ground and then was told to rise up a bit and rain down leading to soil acidification (or whatever it was)...

In my opinion and despite manmade global warming being true or not there also are things that should be considered too. I mean how many terrawatts or whatever the recent scale is do we set free in terms of electromagnetic waves? It's not like all of the waves just float around doing nothing - they most cerainly will lead to tiny heating phenomenoms. I don't know if that's a big deal or not though but I never even read of someone actually considering this seriously...