Today you can help the environment by sending your kids outside to play. It can improve their concentration and fight climate change. Researchers at the University of Illinois found that children with attention-deficit hyperactivity disorder who took walks outdoors raised their attentiveness scores AND kids who walked in natural settings did better than those who walked city streets. A dose of nature was just as effective as a dose of Ritalin. Of course, the more time kids spend playing outdoors the less time they’ll spend at video-game consoles—which consume an estimated 16 billion kilowatt-hours of electricity annually.