Homework - May 8

What, or how, should we be teaching students about recycling in school? Try to include the following:
*What age should we start?
*Specifically, how do we teach this - indirect, or planned lessons, etc.
*Should it continue on through every grade, and/or when should it stop?

Do you think this would be the best way to develop a society that recycles without needing incentives? What are some other ways to maintain a society that cares about waste and recycling / the environment?