There is a wonderful picture book by Silverstein called The Giving Tree.
It would be a great start to get elementary kids thinking about their
relationship to the environment.
It follows a young boy who grows into an old man and takes and takes from
the tree. It It gets the point across and is touching. The tree is a
nuturing mother-like fiqure. Perhaps students could make other
personified images of nature's gifts. The five Chinese elements, fire
water earth metal and wood, can be looked at as creative or destructive
materials depending on our use of them. This could be astarting point for
environmental art. I remember a second grade teacher who had students us
the collected lint from clothe's dryers to make images. They drew pictures
and pasted the material on to them. This material is pretty close to home.