I thought the UK was the worst for not caring about litter like this. Some of our urban and rural areas are just unbelievable. My partner recently risked some bodily harm when she banged on the window of a parked car whose driver had just thrown a pizza package out of the window. The guy took off and made to head the car straight towards her, veering off at the last minute.
I'm not sure how we change attitudes and values. We've somehow got to make people care about the environment ... and that's a massive undertaking.
Go to most of mainland Europe and you just don't see this sort of thing. People have more respect for the land and their environment.
My own effort to carry this message, which I first posted on here in May 2010 was:-
'Bonnie Scotland'
40D, Tokina 11-16mm f2.8 @ 11mm. ISO100. 1/125@f5.6