文章基本信息

标题：Co-benefits of global, domestic, and sectoral greenhouse gas mitigation for US air quality and human health in 2050
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作者：Yuqiang Zhang ; Steven J Smith ; Jared H Bowden 等
期刊名称：Environmental Research Letters
印刷版ISSN：1748-9326
电子版ISSN：1748-9326
出版年度：2017
卷号：12
期号：11
页码：114033
DOI：10.1088/1748-9326/aa8f76
语种：English
出版社：IOP Publishing Ltd
摘要：Reductions in greenhouse gas (GHG) emissions can bring ancillary benefits of improved air quality and reduced premature mortality, in addition to slowing climate change. Here we study the co-benefits of global and domestic GHG mitigation on US air quality and human health in 2050 at fine resolution using dynamical downscaling of meteorology and air quality from global simulations to the continental US, and quantify for the first time the co-benefits from foreign GHG mitigation. Relative to the reference scenario from which Representative Concentration Pathway 4.5 (RCP4.5) was created, global GHG reductions in RCP4.5 avoid 16 000 PM_2.5-related all-cause deaths yr⁻¹ (90% confidence interval, 11 700–20 300), and 8000 (3600–12 400) O₃-related respiratory deaths yr⁻¹ in the US in 2050. Foreign GHG mitigation avoids 15% and 62% of PM_2.5-and O₃-related total avoided deaths, highlighting the importance of foreign mitigation for US health. GHG mitigation in the US residential sector brings the largest co-benefits for PM_2.5-related deaths (21% of total domestic co-benefits), and industry for O₃ (17%). Monetized benefits for avoided deaths from ozone and PM_2.5 are $137 ($87–$187) per ton CO₂ at high valuation and $45 ($29–62) at low valuation, of which 31% are from foreign GHG reductions. These benefits likely exceed the marginal cost of GHG reductions in 2050. The US gains significantly greater air quality and health co-benefits when its GHG emission reductions are concurrent with reductions in other nations. Similarly, previous studies estimating co-benefits locally or regionally may greatly underestimate the full co-benefits of coordinated global actions.