From Kiehl and Trenberth, 1997, we have 60% of the energy radiated into space by the Earth as coming from water vapor, 26% from CO[sub]2[/sub]. So water vapor is the star of the show, at least when seen from space … and certainly not negligible. I think it’s a mistake to say that man-kind’s CO[sub]2[/sub] pollution is causing climate change and melting ice caps. More correct is to say that man-kind’s CO[sub]2[/sub] pollution is contributing to climate change and melting ice caps. At this time, we don’t know how much.
There’s a couple dozen factors that effect climate. To focus on just one and say that’s the only thing to consider is wrong. For example, solar output is notoriously unpredictable, so any prediction based on this factor will be speculative at best, completely bogus at worst.
The issue starts when we pump the stuff out of the ground, releasing plumes of toxic gas that is killing people living downwind. Then we fill railroads cars full and have them explode in some small community, killing half the people and burning the whole joint down. How about these pipelines springing leaks flooding residential neighborhoods with crude oil? I don’t know, my friend, coastal communities having to add three feet to their seawalls in the next 100 years isn’t a problem, the Dutch have been doing this for over 750 years and they’ve thrived.
The citation above used to be found at the University of Texas, but it is currently giving a “reset” error. The full reference is Kiehl, J.T. and Trenberth, Kevin E.; “Earth’s Annual Global Mean Energy Budget”; Bulletin of the American Meteorological Society Volume 78, Issue 2 (February 1997): pp 197-208