What is the U.S. Global Change Research Program? What does it do?
The U.S. Global Change Research Program (USGCRP) was mandated by Congress in the Global Change Research Act of 1990 (GCRA) to coordinate “a comprehensive and integrated United States research program which will assist the Nation and the world to understand, assess, predict, and respond to human-induced and natural processes of global change.” USGCRP comprises 14 federal departments and agencies that conduct or use research on global change and its impacts on society.
What is the National Climate Assessment and why is it written?
The GCRA mandates that USGCRP deliver a quadrennial assessment, which has become known as the National Climate Assessment (NCA). The NCA is required to a) integrate, evaluate, and interpret the findings of the Program and discuss the scientific uncertainties associated with such findings; b) analyze the effects of global change on the natural environment, agriculture, energy production and use, land and water resources, transportation, human health and welfare, human social systems, and biological diversity; and c) analyze current trends in global change, both human-induced and natural, and project major trends for the subsequent 25 to 100 years.
How many NCAs are there?
To date, four NCAs have been released. The first NCA was published in 2000, and the second was published in 2009. More information on these reports can be accessed
here. The third NCA,
Climate Change Impacts in the United States, was published in 2014 and can be accessed
here. The fourth NCA (NCA4) was delivered in two volumes, the
Climate Science Special Report (CSSR) and
Impacts, Risks, and Adaptation in the United States. It was completed in 2018.
NCA4 was released in two parts. Will that be the case for NCA5?
Volume I of NCA4, the CSSR, was a comprehensive update on the state of the science of climate change and its impacts. It was not intended to be a regular part of the NCA development process.
NCA5 will draw heavily on the CSSR and, similar to previous NCAs, include chapters that focus on the state of the science of climate and global change, responding fully to the GCRA mandate.
Will NCA5 offer policy recommendations?
Consistent with common practice for USGCRP assessment products, NCA5 will be a technical scientific assessment. It will not make policy recommendations or evaluate existing or proposed policies.
When will NCA5 be released?
NCA5 is currently expected to be released in late 2023. USGCRP respects the quadrennial mandate, and will work to ensure the assessment is completed as close as possible to that timeline while providing authors and staff the time to develop a comprehensive, transparent, and authoritative scientific assessment. See the current timeline for more information.
