I thought the term "Global warming" had been dropped by most campaigners in favour of "Climate Change"?
Anyway, Theland is correct. It's a scam. To make loads of dosh out of us, the great unwashed. It's a power grab thing to influence the worlds' industrial and financial markets in favour of a small minority, led by Al Gore.
It'd be more interesting to see a debate between two "authorities" with divergent views than see someone built up and then asked for their interpretation. Been plenty of times in the past when pet "experts" have spoken out in opposition with the mainstream wisdom and later proved to be in error. Giving one person a soapbox and not probing deeply with difficult questions is not overly informative.