Fourth National Climate Assessment, Volume I

Climate Science Special Report

by D.J. Wuebbles, D.W. Fahey, K.A. Hibbard et al.
U.S. Global Change Research Program

Executive Summary (36 pp. 17.7 MB
https://science2017.globalchange.gov/downloads/CSSR2017_PRINT_Executive_Summary.pdf

Full Report (477 pp. 27.8 MB
https://science2017.globalchange.gov/downloads/CSSR2017_FullReport.pdf

New observations and new research have increased our understanding of past, current, and future climate change since the Third U.S. National Climate Assessment (NCA3) was published in May 2014. This Climate Science Special Report (CSSR) is designed to capture that new information and build on the existing body of science in order to summarize the current state of knowledge and provide the scientific foundation for the Fourth National Climate Assessment (NCA4). Since NCA3, stronger evidence has emerged for continuing, rapid, human-caused warming of the global atmosphere and ocean. This report concludes that “it is extremely likely that human influence has been the dominant cause of the observed warming since the mid-20th century. For the warming over the last century, there is no convincing alternative explanation supported by the extent of the observational evidence.”

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