You know, my father was part of the WWII generation. He and my uncles thought nothing of throwing their Hyde Park beer cans on the ground. No one, then, thought anything about. Then came the "ecology movement" and the Iron Eyes Cody "crying Indian" commercial and we all woke up. But it seems the next generation is going back to those ways. I observed a young kid who was a friend-of-a-friend.... throw an empty beer can on a bank during a float on the Castor River a couple of years ago. I can't alter his behavior any other time but I made sure that was the last beer can thrown on that particular day.