Most of these monthly tips not only help the environment, they also save you money. This month is no exception. Those AC adapters you plug in to charge your cell phones, smart watches, iPads, etc., actually use some energy even when your device is not plugged in and charging. It’s slightly less convenient, but it’s best to unplug the wall adapter when not charging. True an individual charger is not a huge power vampire, but millions of chargers left plugged in 24/7 translates into millions of kilowatt hours consumed every year. And each kilowatt hour equals about a pound of carbon dioxide being released into the atmosphere.