Yup, it's crazy how lots of people think nothing of littering. I think karma...I HOPE karma bites them in the ass :) Alllllthough, I can't say I was perfect when I was a teenager :)
Coke and Pepsi have a 2 billion $ business with selling Dasani and Aquafina water alone. They are both going to put their water in cans fairly soon because of the backlash of the public not liking their water in plastic, and if you are wondering why they don't use reusable glass...it's because the public said the glass might hurt someone if it broke :)