Microplastics are accumulating at pretty high levels all over the food chain, right? The burden of proof should be on the folks who want to run the “let’s all eat this new thing in great quantities” experiment.
https://ourworldindata.org/ocean-plastics
What we need to do is assist these few countries with better waste management, that is what by far would have the biggest impact. Not saying we shouldn't do other things too like trying to find new materials for fishing nets or reducing fishing but plastic bags in the west is not a significant source.
The same fires that poison the air we breathe also power life saving medical equipment so that we can keep breathing.
Micro plastics, endocrine disrupters and more have been unleashed. I am sure their effects will prove to be less than positive on both humans and wildlife.
But in trying to snuff out the next great environmental crisis, will we account for the benefits we've derived from the use of these materials when we do our cost-benefit analysis? The effects on innovation?
Did curiosity kill the cat, but save cats?