better yet, get a pig, there not hard to take care of (relitivly speaking) and they eat almost anything compostable (food wise anyway. NOT COFFE GROUNDS!) and when you send it off to slaughter, you have the best pork/bacon/ham/etc. ever!! and eating something that you raised/grow helps out the enviromnet a lot. (donate the manure, or use it in a garden)
the best way to "get involved" is to tell others, "hey, pick that up!" or talking to them about the envirment and the benifits and why we should take care of our mother (earth)