Most of the evangelicals who are wringing their hands over global warming are simply playing America's favorite game; namely, follow the leader -- with the leader, of course, being that conglomeration of media, politicians, and pseudo-academics that make up the liberal establishment. Don't bother about the ethical priorities established by the Bible (the gospel, authority of Scripture, sanctity of life, sexual morality, etc.) and don't bother to investigate the hard evidence, just jump aboard whatever bandwagon is being pulled by the television networks.
Here is an example of how the MSM crows whenever they see Christians de-emphasize the ethical priorities mentioned above in favor of causes that are more politically-correct. And take note how the spin of both the print and the video here underscores the "progressive" nature of these evangelicals; i.e. away from creationism, away from right-to-life issues, away from the policies of President Bush.
Thanks, Cyndy, for the heads-up about the story.