One of the biggest causes of pollution of the Earth as the waters are plastic bags, to be non-biodegradable elements, you can spend many years as garbage, not just littering the environment, but also endangering the lives of aquatic animals that may confound them with algae or jellyfish that used to feed.
That is why, if we want to take care of the environment, one of the best things we can do is reduce the use of plastics or synthetic non-biodegradable, as for example to use bags made of paper or cardboard.
Paper or cardboard takes a time much lower to degrade naturally, it is made with natural products, that can be used to pay the Earth, but if the animals eat does not bring major problems.