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Valuing the Global Mortality Consequences of Climate Change Accounting for Adaptation Costs and Benefits

Carleton, Tamma and Jina, Amir and Delgado, Michael and Greenstone, Michael and Houser, Trevor and Hsiang, Solomon and Hultgren, Andrew and Kopp, Robert E. and McCusker, Kelly and Nath, Ishan and Rising, James and Rode, Ashwin and Seo, Hee Kwon and and Viaene, Arvid and Yuan, Jiacan and Zhang, Alice Tianbo, Valuing the Global Mortality Consequences of Climate Change Accounting for Adaptation Costs and Benefits (Aug. 3, 2020). National Bureau of Economics Working Paper No. 27599, Available at NBER: http://www.nber.org/papers/w27599

This paper estimates that the release of an additional ton of carbon dioxide today will cause mean damages to global mortality risk valued at $36.6 under a high emissions scenario and $17.1 under a moderate scenario, using a 2% discount rate that is justified by US Treasury rates over the last two decades.
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Ice sheet contributions to future sea-level rise from structured expert judgment

Bamber, Jonathan L., Michael Oppenheimer, Robert E. Kopp, Willy P. Aspinall, and Roger M. Cooke. “Ice sheet contributions to future sea-level rise from structured expert judgment.” Proceedings of the National Academy of Sciences (2019): 201817205.

Future sea level rise (SLR) poses serious threats to the viability of coastal communities, but continues to be challenging to project using deterministic modeling approaches. Nonetheless, adaptation strategies urgently require quantification of future SLR uncertainties, particularly upper-end estimates. Structured expert judgement (SEJ) has proved a valuable approach for similar problems. Our findings, using SEJ, produce probability distributions with long upper tails that are influenced by interdependencies between processes and ice sheets. We find that a global total SLR exceeding 2 m by 2100 lies within the 90% uncertainty bounds for a high emission scenario. This is more than twice the upper value put forward by the Intergovernmental Panel on Climate Change in the Fifth Assessment Report.
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Strengthened scientific support for the Endangerment Finding for atmospheric greenhouse gases
We assess scientific evidence that has emerged since the U.S. Environmental Protection Agency’s 2009 Endangerment Finding for six well-mixed greenhouse gases, and find that this new evidence lends increased support to the conclusion that these gases pose a danger to public health and welfare. Newly available evidence about a wide range of observed and projected impacts strengthens the association between risk of some of these impacts and anthropogenic climate change; indicates that some impacts or combinations of impacts have the potential to be more severe than previously understood; and identifies substantial risk of additional impacts through processes and pathways not considered in the endangerment finding.
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