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 4
Looking forward • <Current estimates reasonable> • Expert review • Regularized process • High value research – Impacts and integration – Peer review of models – Low probability, extreme events 5
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