The Climate Science Special Report (CSSR) is an assessment of the science of climate change, with a focus on the United States. Released in 2017, it represents the first of two volumes of the Fourth National Climate Assessment (NCA4), mandated by the Global Change Research Act of 1990.
As Volume I of NCA4, CSSR is designed mainly for a scientific audience to inform further assessment of climate-related risks and decision-making about responses. According to U.S. Global Change Research Program (USGCRP), the report serves several purposes, including providing 1) an updated detailed analysis of the findings of how climate change is affecting weather and climate across the United States; 2) an executive summary and other CSSR materials that provide the basis for the discussion of climate science found in the second volume of the NCA4; and 3) foundational information and projections for climate change, including extremes, to improve “end-to-end” consistency in sectoral, regional, and resilience analyses within the second volume.
Readers serving tribal communities may find this report a valuable reference when conducting mitigation and adaption planning efforts as it provides an authoritative assessment of the latest evidence of climate change throughout the United States, including technical analysis of weather extremes, changes in sea ice, increases in ocean temperatures, and ocean acidification.
You can view the CSSR here.