Green Guilt
"The same demographic group for whom religion has little or no hold (namely white liberals) turns out to be the most virulent champions of all things green. Is it possible that these folks must vent their moral spleen on environmentalism because they don't have all the theological campaigns (e.g., opposing gay marriage, opposing abortion, etc.) on which social conservatives exercise their indignation?"
excellent article on the philosophy and instictiveness of the religion of green guilt here