Schism
WKR
I know on pretty much every hunting trip, I will be hiking in a place so steep and so nasty and so thick that I think to myself "I wonder if anyone has ever walked here in the last thousand years." Then I will look down and see a six pack of spent coors bottles. I'm torn between hating the people that do that and wonder/admiration for the guy who lugged a six pack of bottles up a talus slope at 10,000 feet. I mean, who does that? The most athletic alcoholic ever?
Snowmobile riders are a likely source. I've seen it myself on one snowmobiling trip. Guys will stop in the backcountry and drink a 6-pack and leave the cans or bottles in the snow. I picked them up on that particular occasion and haven't ridden with them since.