The answer to the question, "Why are plastic bags bad?" is quite simple: Plastics cannot completely break down. They are not biodegradable. This includes plastic bags! Plastic bags are constantly polluting our world, from the litter of the whole bag on land to the tiny particles it becomes (which pollute everywhere, including the air and water).
Plastic bags are so bad for wildlife. They pose a potential choking, strangling, and entangling hazard.
As much petroleum that it takes to make plastic bags, more people could be using it for heat or gasoline. Plastic bags are not only a nuisance and a hazard… They are unnecessary!