Paleface. I suspect wholeheartedly that they did indeed create waste and trash, especially in the larger settlements, however, theirs was not the type that stays around for centuries, except for the lithic type. I also suspect highly that if they had plastic bottles and glass bottles and cigarettes with filters, the landscape would have looked like it does earlier. \\\\\\
One person throwing out some trash is nearly invisible. Thousands, or millions doing so and it is no longer invisible...but...then it becomes an accepted and expected part of the landscape.
How many people do you see and hear today that bitch like heck about the litter....but do nothing about it. it is always "someone else's" responsibility or fault.
It doesn't end at litter. We are...what we are.
ChuckC