Once, several months back, we collected rubbish on the way home and he decided it was time to do it again. We filled a bag with recyclables and three with other rubbish. It felt like a good thing to do. I made sure no one picked up food scraps or tissues, and that we all washed our hands well when we got home!
I must say that the walk to and from kindy is much nicer without all the rubbish. I still find it hard to believe that people care so little about the places they live in.