Grist: Breaking: Americans don’t know squat about how to save energy. A new survey quizzed people on what steps make the biggest difference in cutting energy use and found loads of confusion. Participants greatly overrated low-impact moves like flipping off light switches and unplugging phone chargers. They underrated potential high-impact changes like weatherizing homes, buying high-performing appliances, driving higher-mileage vehicles, and switching from centralized A/C to room air …