|The National Climate Assessment (NCA)
|September 11, 2019
The National Climate Assessment (NCA) summarizes the impacts of climate change on the United States, now and in the future. It is the most comprehensive, authoritative, transparent scientific report on U.S. climate change impacts ever generated.
A team of more than 300 experts guided by a 60-member Federal Advisory Committee produced the report, which was extensively reviewed by the public and experts, including federal agencies and a panel of the National Academy of Sciences.
The National Climate Assessment collects, integrates, and assesses observations and research from around the country, helping us to see what is actually happening and understand what it means for our lives, our livelihoods, and our future. The report includes analyses of impacts on seven sectors - human health, water, energy, transportation, agriculture, forests, and ecosystems - and the interactions among sectors at the national level. The report also assesses key impacts on all U.S. regions: Northeast, Southeast and Caribbean, Midwest, Great Plains, Southwest, Northwest, Alaska, Hawai'i and Pacific Islands, as well as the country's coastal areas, oceans, and marine resources.
Over recent decades, climate science has advanced significantly. Increased scrutiny has led to increased certainty that we are now seeing impacts associated with human-induced climate change. With each passing year, the accumulating evidence further expands our understanding and extends the record of observed trends in temperature, precipitation, sea level, ice mass, and many other variables recorded by a variety of measuring systems and analyzed by independent research groups from around the world. It is notable that as these data records have grown longer and climate models have become more comprehensive, earlier predictions have largely been confirmed. The only real surprises have been that some changes, such as sea level rise and Arctic sea ice decline, have outpaced earlier projections.
This report documents the changes already observed and those projected for the future.
The National Climate Assessment (NCA) is conducted under the auspices of the Global Change Research Act of 1990, which requires a report to the President and Congress every four years that evaluates, integrates, and interprets USGCRP findings. The NCA aims to incorporate advances in the understanding of climate science into larger social, ecological, and policy systems, thereby providing integrated analyses of impacts and vulnerability, helping the Federal Government to prioritize climate science investments, and delivering science that can be used by communities throughout our Nation to plan for a more sustainable and environmentally sound future.
To view the report visit http://nca2014.globalchange.gov/report
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