Tesco used biodegradable bags but they weren't lasting long compared to the original bags.
They couldn't be used for much because they started falling apart within weeks.
isn't that kind of the point?
There are microorganisms that eat certain polymers (PE), but I don't think anything will ever eat PTFE (teflon)
I'd bet that switching away from teflon frying pans you'll help the environment more than getting rid of a life time of PE bags. F chemistry is super nasty
For that matter, most people probably have more PTFE in their plumbing than stored in their kitchen cabinets.