morfe, the evidence is fairly incontravertible these days.
Merrick's a better person to point towards good sources though. I tend to get my climate stuff from him. After all, who has time to research everything? I generally stick to the energy stuff... Merrick knows I research it well enough to make my conclusions quotable (that I'll have references should anyone challenge). In the same way, I know his conclusions on Climate Change are well-referenced.