"Well, I might be onto something with my unconventional views on the current global warming craze too. Maybe. You're going to have to wait and see if I am, and that will take some time."

The thing is LH, if we do wait to see and it turns out that you're WRONG, then it's too late. If we act now to alleviate it and subsequently find we were wrong to do so, the consequences are potentially less catastrophic.

I don't see any point in contributing to the "is it man" argument, we most of us have entrenched positions either way by now. The fact is the vast majority of scientists in relevant specialisms think a considerable element of the warming is down to human intervention. Yeah they MAY be wrong. However even if informed opinion was split 50:50 I believe the above argument applies.