That's another thing which intrigues me: How can everyone be so sure that any climate change must be bad?
Granted, if sea levels rise we would lose some coastline and oceanside infrastructure (there's that pesky economic issue again), but in terms of overall land we'd also gain as currently useless areas become habitable. Siberia could probably stand to warm a bit.
I see this same sort of issue with the animal lovers--all extinction *must* be bad, regardless of how some amount of extinction has always happened. I think we're gettiong along just fine without the dodos, and I also think we'll get along just fine if the Earth warms a couple degrees.
Fearmongering and overreaction sells more papers, though.
J_A_B