2. Is clean air a common-pool resource? Answer Yes or No, and then explain your answer by appealing to the definition of a common-pool resource.

3. Put aside for the moment the specific legal and practical problems with the EPA's recently vacated proposal to create a cap and trade system for mercury under Section 111 of the Clean Air Act. As compared to other institutional approachs to controlling mercury emissions, what are the advantages of a cap and trade system? The disadvantages? (2 to 3 paragraph answer)