The mortality cost of carbon

] excess deaths per metric ton of 2020 emissions. This implies that adding 4, 434 metric tons of carbon dioxide in 2020-equivalent to the lifetime emissions of 3. 5 average Americans-causes one excess death globally in expectation between 2020-2100. Incorporating mortality costs increases the 2020 SCC from 37 to 258 -69 to 545 per metric ton in the baseline emissions scenario. Optimal climate policy changes from gradual emissions reductions starting in 2050 to full decarbonization by 2050 when mortality is considered.