Glad you asked.
Start here.
There's even a cool interactive presentation at a link on that page.
The money being shoved at AGW-dependent research and industries dwarfs the money being spent on opposition. This is where the bread is buttered, and as I said on the other thread, if oil company money is supposed to corrupt the resulting research, there's no reason to believe the pile of cash on the other side couldn't have the same effect.