Washington Post: The phrase “clean coal” is polluting the energy debate. The phrase is an oxymoron. We can come up with ways to clean up after coal – many of them very expensive and, in the case of coal’s greenhouse gas emissions, untried. And we can use coal more efficiently than in the past. But coal itself is not clean and never will be. That is a matter of chemistry and geology. That hasn’t stopped the phrase “clean coal” from seeping into politics like coal dust on a Beijing morning. Indeed it’s …