Washington Post: When Maryland and the District set floors requiring electric utilities to use increasing amounts of renewable energy, environmentalists cheered the prospect of money going to new solar and wind projects. But today, several years after the legislation went into effect, it has had an unexpected outcome. Thanks to a wrinkle in the definition of renewable, the lion's share of the money used to meet those standards is flowing to paper companies that burn "black liquor,' a byproduct of the wood-pulping...