CO2 is a greenhouse gas. That is simple physics and can be demonstrated by a smart sixth-grader. We have now gone from about 250ppm to 400 in only a hundred and fifty years, but some still think this has no affect on global temperatures. I've got some news for you deniers - nothing else fits the already observed warming EXCEPT forcing by carbon dioxide. If you can prove otherwise I'd love to see it because believe it or not - I WANT TO BE WRONG! I would love nothing better than to see some peer-reviewed science showing that we are not totally screwed as a civilization but right now the vast majority of papers I see point to ecological disaster right around the corner.
Shit, might as well drink a toast. To humanity! We had a good run but we are still just apes with guns.