The Clean Air Act and Climate Change


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The Clean Air Act (CAA) requires management of all major sources of greenhouse gases. Under Section 111(d) EPA has proposed guidelines to cut emissions from existing power plants through State Implementation Plans (SIPs) and a Best System of Emissions Reduction (BSER). EPA has already implemented emissions standards for cars and new power plants through the CAA. See how the CAA addresses GHG emissionsand how State Climate Action Plans provide a foundation for future action.



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Over half of the US states have developed comprehensive, stakeholder based, climate action plans with detailed policy strategies and assessments for all sectors, including energy supply and use. These have demonstrated the feasibility of significant emissions reductions, and provide tools and experience for states to draw upon for flexible actions under Section 111(d) of the CAA. See economic, energy, and environmental approaches and results of state climate and energy planning.




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State Implementation Plans (SIPs) under Section 111(d) of the Clean Air Act can benefit from flexibility tools used in state climate action plans. For instance, The Center for Climate Strategies (CCS) has formulated tools and templates into a stepwise, comprehensive planning and analysis process for consensus building with over 20 states and 1,500 stakeholders. See how these work, and have been implemented through comprehensive climate action planning.