I am mostly thinking in terms of wildlife. While developing better gill nets is also top priority, plastic is having an enormous impact.
See River Plastic Pollution Sources • The Ocean Cleanup
It’s a good thing this ends up in a central location in the pacific so we can clean it up, and some animals are evolving towards eating plastic, and recycling processes get more sophisticated. But it’s still going much too fast. Bioplastics are great because they are absorbed back into the soil again, and can be digested. There are also other alternatives that are currently expensive, but if we invest in it can be automated increasingly further. Think for example hot pressed bamboo for enclosure shells instead of plastic - it needs no synthetic materials as it can be self-bonding when pre-processed well because of the lignin content.