I work in a garbage company that works with schools in my region, and I noticed that a lot of these have been taught to children and were even implemented using their help. One school commisioned us to paint over our garbage bins and make it clearer what exactly goes into which bin. It was a great group effort between us and the school, and in addition to that we taught them how we dispose of their waste, organic or not. Saving the Earth one step at a time, as they say.