The document discusses four perspectives on acid rain: 1) The biologist discusses how acid rain affects forests, soil, and fish. Forests in Germany and Switzerland have seen declines in biomass of 20-73% in some tree species due to acid rain. Soil nutrients are depleted through leaching. Fish are killed when acidity in waters increases. 2) The economist discusses the Clean Air Act and its $119 billion benefits. Acid rain destroys forests and biodiversity, contaminates drinking water, harms agriculture and livestock, and decays infrastructure and historical monuments. 3) The health officer states that while acid rain itself does not directly harm humans, the pollutants that cause it (sulfur dioxide