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So last Friday the Environmental Protection Agency decided to put a gun to the head of Congress and play cap-and-trade roulette with the U.S. economy.

The pistol comes in the form of a ruling that carbon dioxide is a dangerous pollutant that threatens the public and therefore must be regulated under the 1970 Clean Air Act. This so-called "endangerment finding" sets the clock ticking on a vast array of taxes and regulation that EPA will have the power to impose across the economy, and all with little or no political debate.

The Obama EPA has now opened this Pandora's box. The centerpiece of the Clean Air Act is something called the National Ambient Air Quality Standards, or NAAQS, under which the EPA decides the appropriate atmospheric concentration of a given air pollutant. Under this law the states must adopt measures to meet a NAAQS goal, and the costs cannot be considered. For global warming, this is going to be a hugely expensive futility parade.