I'm more worried about another ice age than global warming. The planet is relatively cool compared to the planet's history, despite the recent warming trend. Warmer temperatures have generally triggered increases in biodiversity throughout Earth's history (Cambrian period and Mesozoic era). While I don't disagree with the idea that we're currently witnessing a mass extinction(due to habitat destruction), I think we'll see another drastic increase in biodiversity if this warming trend continues. Well, we won't see it, but our ancestors will. My point? The climate will NEVER be static. Global warming is good.