As others have said, we all have to make the effort to do our bit. However, the genie left the bottle a long time ago around this subject and even if we totally stopped using micro plastics now I cannot imagine how long it would take for the planet to recover.
Unfortunately, from what I see scattered around the countryside when I'm out walking, not to mention the cr*p I see left on the banks of waters I fish by seemingly 'caring' anglers, is truly amazing. Walkers, who by definition (you would think) are likely to be countryside loving folk who care about the environment still seem to find it okay to dump plastic drink bottles/ sandwich wrappers along public footpaths. I've seen them do it!!
As anglers we all buy items in plastic containers of some sort, simply because that is how they are packaged. That doesn't mean we cannot make every effort to dispose of them in the correct manner. I sort mine and stick it in the 'reusable' bin or take anything big to the local council tip. Ours still only manages to reuse 50% of that bought in by the public, but a lot better than it was 20 years ago!!
ps I do have to wonder why folk go to the coast and actually allow children to swim in the sea these days........................