Up in MA (about boston) they now have to charge for bags. 10cents in cambridge, 5 cents in Boston and a bunch of surrounding towns do the same. Its been a couple years and you seem to see a lot fewer of them as trash. (We had one that got blown up into a tree near where I live..)

After some initial griping I've gotten used to it. Its not a lot of money, but it makes you more conscious of it (Because "do you need a bag" = $).