I just purchased these colorful "Go Green (Forever)" stamps from USPS. Not only are they a helpful reminder to each and every one of us to do our part in being kind to the environment, their "forever" status guarantees that you can use them to post mail in the United States indefinitely, regardless of the next postal stamp price increase (which is bound to happen, sooner or later). As is often the case, it's doing the little things that invariably creates the most impact. Turning off a light here, fixing a water leak there. If enough of us choose riding a bicycle over driving a car or remember to bring reusable bags to the grocery store, we can change the world, people. Buy them here.