Discover how much electricity humanity uses, and how clean energy sources could help revolutionize our energy supply in the future. — All around the world, millions of people are flipping a switch, plugging in, and pressing an ‘on’ button every second. So how much electricity does humanity use? And how much will we need in the future? Discover how much energy it takes to power the world, and how clean energy sources could help revolutionize our electricity supply.