I think they've gone too far. They've hyped the disaster scenario so much, that in the end all one can do is shrug one's shoulders and say 'fuck it then. If the ship's going down, might as well keep partying."
Which would be a mistake, as there are indeed many things which should concern us about the environment. Unfortunately the things we can and should do something about will most likely be ignored, due to the excesses of the enviro-mentalists.