Chief Justice Roberts seemed to express a sympathetic view of the EPA’s obligations under the Clean Air Act.   In this clip, you hear Chief Justice Roberts responding to Texas Solicitor General Jonathan Mitchell, who was arguing on behalf of the state and local respondents.   Mr. Mitchell began his oral argument by stating that the EPA cannot impose a federal implementation plan (which you will hear him call “FIP”) because the states, in creating their state implementation plans (which you will hear him call “SIPs”), lacked guidance from the EPA about the “contribute significantly” language from the Clean Air Act.   Chief Justice Roberts responded by agreeing that it is a difficult task, but that “it is what the statute says.”  Moreover, Chief Justice Roberts stated, “It seems to me that if EPA had taken a different view, it would have been contrary to the statute.”