Compare the success of the often-touted sulfur dioxide trading system the U.S., instituted in 1990, with the speed and quantity of reductions under rule-based systems during the same period. U.S. SO2 emissions dropped by 31% between 1990 and 2001. Over the same period of time, under old fashioned rule-based regulation, Germany reduced its emissions by 87%, Italy by 62%, and Western Europe as a whole by 57%.
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