Things that can be dissolved (fruit nuts, banana skin, or paper handkarchiefs) i throw in the forrest. Dhey quickly become food for the plants. Other things I carry to the nearest trash bin.

Once on a group ride a chick threw an empty coke bottle by the road. I gave her a look. She smiled and said "when we come back next time, hope there'l grow a coke tree". It was funny.

Didn't see her litter ever again though.