Indeed, it was Ronald Reagan’s administration that pioneered the use of cap and trade to phase out leaded gasoline in the 1980’s. George H. W. Bush’s administration used it to reduce SO2 emissions from power plants in the 1990’s, and his son’s administration sought to use it to reduce SO2 and other emissions further in the 2000’s.
事实上，是罗纳德·里根总统的政府率先在1980年代运用设限+交易手段去淘汰含铅汽油。老布什政府在1990年代沿用这一手段去减少发电厂的二氧化硫并取得了成功，随后其子小布什又试图用它进一步减少二氧化硫以及其他污染物排放。