Energy extremism has tricked its way into the mainstream. Three shades of it now control politics in the US. In an area where mistakes cost large amounts of money, the potential for error is high.Triangular extremism has infused American politics with repugnance for oil and gas. It might be more accurate to say that extremism has pushed onto center stage a prejudice never absent from the political fringe. Either way, it threatens to radicalize energy law and regulation.Aversion to fluid hydrocarbons is manifest in legislation that would raise taxes uniquely on oil and gas producers and divert proceeds to energy forms preferred by politicians-and energy providers receiving the money-but no...