I decided to have a green tea because it’s healthier than soda. It’s healthier, right?
These microplastics are digestible by your immune system, though, which makes them ultimately harmless. PLA is used for drug delivery for this reason.
Being concerned about incomplete PLA degradation is like being concerned about a piece of wood breaking down into micro-woods. Yet even if you get a dangerous shard of micro-wood embedded in your skin, your body can deal with this cellose polymer just fine.
Ultimately it will break down completely someday and in the meantime, nothing will be harmed.
You appear to be arguing that even if microplastics are present in the environment it’s not a problem. That’s a brave stance to take given the wealth of information to the contrary.
Even if they did break down it’s bad. Plastics have additives in them which are used to improve their material properties. These additives include BPA and PFAS (and similar). We know that these compounds cause problems in humans and the environment. So if they were “easily digestible by the body” that would absolutely be a big problem.
There’s no world in which “nothing will be harmed” by plastic decaying. Some people even argue that conventional plastics are less dangerous in landfill than bioplastics because at least they don’t release dangerous by-products like microplastics or “forever chemicals”.
