In the debate over his top environmental goals, President Obama is backing away from "cap and trade." Not the policy. It's the phrase itself, deemed confusing by Democratic pollsters, that has all but disappeared from the president's vocabulary of late. Now when Obama talks about forcing companies to bid at auction for the right to emit greenhouse gases, he is more apt to mention "market-based" proposals and "clean energy jobs," hinting at a rich new employment source. Control the language, politicians know, and you stand a better chance of controlling the debate. So the Obama administration, in its push to...