Microplastic pollution is a big problem in China's rivers and lakes. The researchers found that microplastics are everywhere in these water systems, especially in developed areas. The tiny pieces of plastic mainly come from sources like broken-down plastic products. These microplastics can harm animals and plants, but it's hard to know exactly how much damage they cause. China has laws to control plastic waste, but they are not always followed well. The government needs to do more to stop plastic pollution and protect the environment.