Food For Thought on Global Warming

Just throwing these out here. I've found a couple of interesting videos online that show both sides of the debate:
Here's Al Gore in a trailer for his movie, An Inconvenient Truth



Now, here are a couple from the Heartland Institute on the skeptical side:



And finally, here's one more:



So which side are we to believe? I really don't have a clue, but either way, I think this last movie raises a pretty good point when it said that "science is not the language of politicians nor the profession of celebrities." I wonder if the politics (the trillions of dollars at stake) are driving the science instead of the other way around. Who knows!