<prompt> Translate the following text to EnglishMpango wa Mvua ya Asidi na Programu ya Biashara iliyoundwa na Bunge mnamo 1990 ilipunguza uchafuzi zaidi katika muongo uliopita kuliko programu zingine zote za amri na udhibiti wa Sheria ya Hewa safi pamoja, na ilipata kupunguzwa kwa kiasi kikubwa kwa theluthi mbili ya gharama ya kufikia kupunguzwa kwa kutumia mfumo wa amri na udhibiti.  <response>: The acid rain cap and trade program created by Congress in 1990 reduced more pollution in the last decade than all other Clean Air Act command-and-control programs combined, and achieved significant reductions at two-thirds of the cost to accomplish those reductions using a command-and-control system. 