TAM, you keep hammering the fact that Earth's climate has changed over time. I do not think that anybody is arguing with you on that fact. I know that I am not. You don't have to hammer that nail any longer. We get it.

That said, there is the separate question of whether man can have an impact on climate. This impact would superimpose itself on any natural climate change.

Bears, beets, Battlestar Galactica.