[DenisM]

That piece of plastic will spend its hundreds of years of retirement buried in a hole in the ground in the landfill. It produces no harm to whatsoever, and we are not going to run out of land for millions of years.

Whenever I bring this up someone inevitably brings up polluted oceans, so I might as well address it now - if you don't throw your plastic bags into the ocean and neither does your local waste management those bags will never make it to the ocean. They will be in the landfill.