Chemistry-albedo feedbacks offset up to a third of forestation's CO2 removal benefits
成果类型：
Article
署名作者：
Weber, James; King, James A.; Abraham, Nathan Luke; Grosvenor, Daniel P.; Smith, Christopher J.; Shin, Youngsub Matthew; Lawrence, Peter; Roe, Stephanie; Beerling, David J.; Martin, Maria Val
署名单位：
University of Sheffield; University of Cambridge; University of Cambridge; UK Research & Innovation (UKRI); Natural Environment Research Council (NERC); NERC National Centre for Atmospheric Science; University of Leeds; Met Office - UK; Hadley Centre; University of Leeds; International Institute for Applied Systems Analysis (IIASA); National Center Atmospheric Research (NCAR) - USA; World Wildlife Fund
刊物名称：
SCIENCE
ISSN/ISSBN：
0036-9816
DOI：
10.1126/science.adg6196
发表日期：
2024-02-23
页码：
860-864
关键词：
摘要：
Forestation is widely proposed for carbon dioxide (CO2) removal, but its impact on climate through changes to atmospheric composition and surface albedo remains relatively unexplored. We assessed these responses using two Earth system models by comparing a scenario with extensive global forest expansion in suitable regions to other plausible futures. We found that forestation increased aerosol scattering and the greenhouse gases methane and ozone following increased biogenic organic emissions. Additionally, forestation decreased surface albedo, which yielded a positive radiative forcing (i.e., warming). This offset up to a third of the negative forcing from the additional CO2 removal under a 4 degrees C warming scenario. However, when forestation was pursued alongside other strategies that achieve the 2 degrees C Paris Agreement target, the offsetting positive forcing was smaller, highlighting the urgency for simultaneous emission reductions.