My family's business in the 1970s was cleaning windows on tall buildings in Saskatoon (there were dozens). The effects of acid rain on buildings was dramatic. F

My family's business in the 1970s was cleaning windows on tall buildings in Saskatoon (there were dozens). The effects of acid rain on buildings was dramatic. Facades on buildings that had stood since the 1920s were crumbling. Acid rain damage control was a whole segment of our business. Presumably the pollution there was no worse than anywhere else. Emissions controls for vehicles and coal power plants are important. Things would be much worse without them.