Question

Why is there essentially no waste in the natural world except for waste generated by humans?

Answer 1

The reason as to why there is essentially no waste in the natural world is because;  in the natural world, there is essentially no waste since the waste of one organism becomes the nutrients or raw materials for other organisms. Solid wastes are unwanted or discarded material we produce that is not liquid or gas. Mother nature also has her own waste disposal solutions in place for years. In natures one organism's waste is another's feast. Natures clean up crew includes the decomposers, scavengers and the detritivores and also the process of biodegradation.