Climate Benefits of EPA CPP Comments on SCC Billy Pizer History - - PowerPoint PPT Presentation

Assessing the Air Quality and Climate Benefits of EPA CPP

Comments on SCC Billy Pizer

History

• <2008 SCC zero
• 2008: “Certainly not zero”
• Different agency estimates.
• 2009 interim interagency estimate
• 2010 final interagency estimate
• 2013 revised interagency estimate

Challenges for regulatory SCC

• Finding key pieces

– Socioeconomic / emission assumptions – Climate modeling – Impacts

• Choosing what to harmonize

– Socioeconomic assumptions – Discount rate – Climate sensitivity – Global versus local

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Looking forward

• <Current estimates reasonable>
• Expert review
• Regularized process
• High value research

– Impacts and integration – Peer review of models – Low probability, extreme events

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