Global warming isn't a theory. Every single weather phenomenom either can or cannot be assigned to it, but the warming is a fact, as are the records and melting that prove it. Theory will lie in how dramatic and how quick the repurcussions hit, and exactly what form they take.
We have been burning everything from sod to wood to tar to tumbleweeds for thousands of years, but the oil and natural gas really did it, especially with millions of vehicles running it 24/7 for a hundred years or so.
Now we are going to use corn to feed our machines over here. Food to fuel conversions. I would say we are too stupid to survive in the long run, but we did have our run. Multiplying like lemmings will be corrected, as will the fouling of our own air and water and bed. Troubled sleep in that bed. We didn't keep the sustainable balance,so mother nature will do it for us. She's the boss, so to speak, and the oil companies will continue to spend millions lying about it while making billions from it all. Too bad, but oh well.
The occasional volcano adds to it as well