More countries need a bottle deposit system. In Sweden 82% of all plastic beverage bottles are collected for recycling because you get about 10 cents back when you return them.

People who cant get off their asses to do a good thing will walk a mile to collect a nickel. And even if people do throw them out, they never last long on the ground as someone will be along to collect it in short order and grab those ten cents.

The ones who don't get collected for the deposit usually either end up in the combustible trash or the normal plastic recycling.