As a Christian, I believe that I should be trying to take care of the earth... not destroy it. Christians aren't perfect just because they have a belief system. It's not fair to say that just because someone is an atheist and doesn't believe their actions have eternal consequences, they're allowed to screw up... but a Christian who does believe their actions have eternal consequences is not allowed to make mistakes. Being a Christian doesn't make anyone less or more human.
Anyways... I'm just sayin... That's not really a fair statement. I know quite a few non-Christians who believe Global warming is a bunch of crud and aren't environmentally concerned.
And another side note: George W. Bush does NOT represent all Christians, kay?