Page "Acid rain" Paragraph 19

Overall, the Program's cap and trade program has been successful in achieving its goals.

Since the 1990s, SO < sub > 2 </ sub > emissions have dropped 40 %, and according to the Pacific Research Institute, acid rain levels have dropped 65 % since 1976.

However, this was significantly less successful than conventional regulation in the European Union, which saw a decrease of over 70 % in SO < sub > 2 </ sub > emissions during the same time period.