In reply to Euge:
Unfortunately, this happens everywhere.
Many years ago (20+) I, a mate and two of our kids did the Ben. The kids amused themselves by making up a variation of the old Lloyd Grossman show - 'Through the Keyhole'. Their line was, "Who would drop a piece of litter like this?", and unfortunately there was enough to keep them going pretty much all the way to the top.
I live fairly close to football pitches that are used on Sundays. Even when dustbins are placed at both ends of the half way line, rubbish is still all over the place.
Better education might help. I'm not having a go at schools - they have a tough enough job, but a more general push. However, I still think many will take no notice - the fact that some can eat or drink something and then just throw the container away indicates they have little respect for the environment and little consideration for others.
One glimmer of hope, and its just a glimmer, is that the recent media coverage of the impact of plastic in the environment might make some think more, but I'm not holding my breath.
Dave