We’ve been on a Power Trip all week to talk about the future of energy. Today we’re digging down into some of the water-cooler wisdom surrounding energy use. Are cloth diapers really more energy efficient than disposables? Does shutting off the lights really waste more energy than just leaving them on? We’re here to debunk myths—or maybe to confirm them. To help us do that is Matt McDermott, an alternative energy writer for TreeHugger.com and Planet Green.com.