Think about millions of parents all over the world waiting in their idling cars for their children to come out of school. Now add up all that wasted gas and air pollution. Although it may not seem like much when you’re alone in your car idling for a few minutes, when you take into account everyone else doing the same thing at the same time, you’ll realize that small habits have a big impact.

Also, just a couple side notes. Cars typically don’t need more than 30 seconds to warm-up. And contrary to popular belief turning your car off and on won’t wear out your starter.

The next time you’re waiting in your car for more than 30 seconds, challenge yourself to turn off your car instead of idling.