I have personally seen, on a California beach, a carcass of some marine animal, I can't remember but maybe an elephant seal, that had been choked by a plastic g

I have personally seen, on a California beach, a carcass of some marine animal, I can't remember but maybe an elephant seal, that had been choked by a plastic grocery bag. I have seen subsequently, and considered briefly running after, many plastic bags in the streets blowing towards the storm runoff system. And plastic in a landfill tends to degrade over a very long period of time, into substances that seem to have a tendency towards contaminating water tables and ecosystems.