There is a new process for treating wastewater sludge that destroys the microfibers, so that is good news at least. I think it may be expensive, of course. It is called “hydrothermal carbonization”. Basically put the sludge in a giant pressure-cooker and the heat breaks the plastics into carbon and some water-soluble residual molecules which can go back to the start of the wastewater treatment plant to be biodegraded. But like others say, the main source in general is tires - not sure if they know whether tire microplastics are the main source in agricultural land though.
NYT is spouting every headline they can imagine to shift votes toward Trump, and not just lately. Their entire editorial focus is to cast confusion on Democrats’ prospects. They should be recognized as firmly partisan and no longer serving a journalistic purpose. Unfortunate, but that’s the times in which we live.