Kids spreading the word

I was in a local cafe today and heard some older women at the next table talking about "that flyer" by the bathrooms, and although I couldn't quite catch what the flyer said from the snippets of conversation I heard, I could tell it was something to do with the environment. How cool is it that a child's drawing (click on the picture to enlarge it) got two senior citizens to think about their driving habits ? What a great way to spread the word about the negative impacts of idling.