Ok, I'll suppose global warming is real even though instead of using actual climate data that's available they use data that's been computer generated, and even though they shout down and blackball any scientist that disagrees with their flimsy (and logically flawed IMO) conclusions. Yes I'll set all of that aside and consider your statement. Even if it is real, what are you going to do about it? Stop driving? Turn off your electricity and get rid of anything that requires it? What are you doing on Slashdot? Stop talking (if we could get the politicians to do that it might help)? How could you hope to impact it if you don't even definitively know the cause? Do we just keep trying stuff until we find something that works? If it's mankind that is causing it then the obvious solution is to get rid of mankind. You go first off the cliff I'll follow a little later.
I don't think we are at a point where we can say it's undeniable. I don't care how many people you get together to say the same thing if one of them or all of them are full of crap it's still crap. If it were such an undeniable issue then why the need to manipulate data, why the need to blackball dissenting scientists, why the need to garner credibility? Those things alone tell me that this is far from open and shut.
"More software projects have gone awry for lack of calendar time than for all other causes combined." -- Fred Brooks, Jr., _The Mythical Man Month_