I do my part: Energy drink cans, spring water bottles, expired buck lure "bombs", jerkey & candy bar wrappers.
And that's off my own property from slobs that didn't ask permission to hunt or at least disobeyed as that is one of two things I tell those that ask: no litter, no motorized vehicles. I don't post my land, but it pisses me off to no end. I picked up one of those damn aerosol bomb cans and put it in the cargo pocket of my pants. Turns out it wasn't quite dead and I heard an odd noise as it was "psssssscht"ing the last of the buck lure down my leg. I don't use attractant scents - but I do now as those pants still stink two years later.
THAT's why you see posted signs most places. It's the tire ruts, crushed fences, open gates and the garbage - not the occasional gut pile.
Oh, and thanks to all who feel I need old mattresses, tires, bicycles, dead Christmas trees, old washing machines and the like. I realize this has nothing to do with hunters, but It's one more reason to be pissed off when a truck pulls up on the side of the road and not in the driveway.