i'm also with shamus,
global warming is not something we are causing by burning oil and coal, We are like ants compared to the amount of CO2 that nature kicks into the atmosphere. I remember that global warming swindle docu as well, it basically states that the sea dumps many times more co2 into the atmosphere than all our emissions put together.
I really like that documentary, but be warned, as in the inconvenient truth, this documentary also has graphs that have been played with.

And still, burning oil is still a bad thing, because they are a very valuable resource in making plastics and all other synthetic materials. Besides, it sucks to be ripped off by the only "legal" cartel in the world (OPEC)
I want free energy because i don't like to get ripped off, not because i believe that we are "destroying the earth"