Bums Meet Capitalism. Everybody Wins.
For the terminally homeless who opt out of collecting cans and bottles for the deposit money there's a new revenue flow --- Bumvertising! (thanks to Sondrak)
My answer, for the bums AND mother earth, is to put a small deposit on many items you find littering streets and parking lots, such as cigarette packs, fast food wrappers and alcohol bottles and cans.
Either that or give a new home to everyone without one!