Here is a nice hour video that explains the ins and outs of "global warming". It is by Warren Meyer who runs climate-skeptic.com:
I like the point he makes at 28:00 into this video: In twenty years environmentalists and conservationists are going to look back on this era of "global warming" and see it as a period when that single issue "sucked the air" out of the movement. Put simply, the fanatics have seized one issue and are driving the "green movement" over a cliff with an issue which they over-hyped and which won't pan out. This will undermine legitimate environmental and conservation issues that could have profited from the energy and attention which was stolen by the "global warming" crowd.