<prompt> Translate the following text to EnglishKwa mfano, katika mwaka wa 2020, REMSAD ilichukuliwa katika kesi ya msingi ya 2010 na kesi ya msingi ya 2020 na kesi ya Sheria ya anga safi ya 2010.  <response>: For this benefits analysis, we applied REMSAD to the entire U.S. for four future-year a 2010 Base Case, a 2020 Base Case, a 2010 Clear Skies Act Case, and a 2020 Clear Skies Act Case. 