At the Wall Street Journal ECO:nomics conference today, Sierra Club chief Carl Pope casually mentioned that the Sierra Club sits down with corporations having environmental regulatory problems and then uses its expertise in “changing public policy” to help the corporation solve its problem with the government — a novel role for a non-profit organization that is supposed to be working in the public interest. Pope didn’t mention whether the Sierra Club is paid for its “expertise,” but perhaps some of its corporate donors could answer that question.