The Al Gore movie cashed in on his personality and the question of where he had been in the six years since his failed US presidential bid. The same movie starring any NASA scientist would have lost money.

I think this issue of climate change is truly important, and that it is a major tragedy how poorly it's been handled.

I was a scientist. I know where the joy lies. It is wonderful finding a like-minded scientist and delving deep into the language that can only be understood by the handful of experts seated in the front row of your big talk. But good lord, it can be bo-ho-horing to the rest of the world. Make no mistake.