"The Global Change Research Act of 1990 mandates the preparation of scientific assessments of global change. T he Subcommittee on Global Change Research, which coordinates the USGCRP [U.S. Global Change Research Program], has initiated a national, scientifically based assessment of the consequences of climate change and climate variability for the people, environment, and economy of the United States. The goal of the National Assessment is to determine the regional and national implications of climate change and variability within the United States in the context of other environmental, economic, and social stresses."
U.S. Global Change Research Program Resource Library: http://www.library.globalchange.gov/