To help remove microplastics from river, lakes, etc, in order to prevent further contamination.
Since microplastics are harmful and it takes a long time to break down.
Microplastics can be eaten accidentally by humans and animals since they are too small, microplastics can get stuck in one's stomach and can cause some problem because it is not possible to digest.
Once microplastics stack up over time in rivers and lakes, they can cause the fish and other organisms to die out.