Ken
Sadly the high school students are the most obvious here in my neighborhood. I have confronted a few and gotten a blank stare.
SHA pays landscapers to pick up the larger pieces after trash pickup day but only on the SHA property.
Those of us on the other side of the street, are gifted with every single snack wrapper, can, bottle and mcdonalds bag that gets emptied before the walkers get back to the SHA property. I have watched countless times, the same school aged students finish a bottle or unwrap a food item and just let go of it where ever they happen to be standing.
I fill a kitchen sized trash bag every two weeks just from the frontage of my lot and I know the corner resident next door gets twice that.
There are only two or three households out of 20 that are responsible for 90% of the trash. The other 10% seems to be random drivers who developed a habit in years past of dumping the contents of their car mid block where the SHA used to have a trash / free stuff pile before the redevelopment.
Elementary schools seem to try to instill some basic ecology knowledge but I suspect high schools are either not successful at whatever they are attempting to teach or the littering as well as the walking in the street instead of the sidewalk, are forms of rebellion against perceived powerlessness.