What about problems with seemingly no solution? Take the poisonous dust that's all around us. When I see the garbage men using leaf blowers to blow the garbage together at the local bus stop where school children are waiting .. filling the air with dust .. instead of using brushes or vacuums .. I want to call their employer names. What do you even do about this dust? Even if people were aware of the problem of micro plastic, there's hardly anything one can do. The world is already filled with waste that slowly gets ground to particles. Ready to be ingested or breathed in. > Thus more than 2 × 1011 nanoplastics particles are deposited per square meter of surface snow each week of the observed period, even at this remote location, which raises significant toxicological concerns. https://www.sciencedirect.com/science/article/pii/S0269749121012793?via%3Dihub

Thought experiment: Go to some random place in your daily surroundings. Remove your clothes, as these probably have plastics in them. Now how far can you go until find something made of plastic? Thus a source of billions of particles. 1 meter? 2? If you're in a city that's as far as you get.