[Environmental] groups form a kind of ecosystem of their own. They include not just old standbys like the Sierra Club or Greenpeace, but also Ozone Action, Clean Air Cool Planet, Americans for Equitable Climate Change Solutions, the Alternative Energy Resources Association, the California Climate Action Registry and so on and on. All of them have been on the receiving end of climate change-related funding, so all of them must believe in the reality (and catastrophic imminence) of global warming just as a priest must believe in the existence of God.
None of these outfits is per se corrupt, in the sense that the monies they get are spent on something other than their intended purposes. But they depend on an inherently corrupting premise, namely that the hypothesis on which their livelihood depends has in fact been proved.