Yale Environment 360: The world’s biggest untapped energy source, according to energy expert Amory Lovins, is efficiency. But don’t call it “conservation.” In an interview conducted by science writer Carole Bass for Yale Environment 360, Lovins, the co-founder and chairman of Rocky Mountain Institute, says that word connotes “privation, discomfort and curtailment.” By contrast, “efficiency” means “doing more and better with less energy and money, but with more brains and technology,” he says. The …