Oh Lordy, so many people repeating so many easily disproved chestnuts.

Global cooling was predicted in the 70's ! (It was a minor theory, without any real support.)


The climate has changed in the past. (Yeah, and water levels have fluctuated in the past. But if someone builds a dam downstream and my yard starts to flood, I'm not going to just shrug and call it a natural phenomena.)

And so on.

And then there was one guy who claimed that the role of CFCs in ozone depletion had been thoroughly debunked.