Electronic devices are always sucking up energy, even when they’re not in use. Research shows these sneaky energy vampires can account for 5 to 10 percent of an average household’s energy consumption, as well as about 1 percent of worldwide carbon dioxide emissions. It can be a pain to unplug printers or computers all the time, so instead, get a smart power strip that will automatically shut down power to devices in standby mode. Some of these strips even come with a motion sensor that automatically turns off power to some of its outlets if the room is empty for an extended period of time.