In paragraph 3 of The Pollution Problem what point is the author making when he talks about acid rain?

In paragraph 3 of "The Pollution Problem," the author emphasizes the detrimental effects of acid rain on the environment, highlighting how it results from industrial emissions and vehicle exhaust. This phenomenon not only harms aquatic ecosystems but also damages forests and soil quality. By discussing acid rain, the author underscores the interconnectedness of pollution sources and their far-reaching consequences, illustrating the urgent need for environmental protection measures.