"A recent U.S. scientific assessment project -- one of a series commissioned by the U.S. Global Change Research Program (USGCRP) -- examined how these climate changes are affecting agriculture, land resources, water resources and biodiversity in the United States. While this document offers readers a summary version of the original report, a limited amount of new information drawn from support¬ing scientific materials has been added to provide additional detail on the original findings. The lead sponsor of this activity was the U.S. Department of Agriculture (USDA); the National Center for Atmospheric Research (NCAR) led and coordinated the project. The time horizon considered was 1900 to 2100, but the main focus was on the recent past and the next 25 to 50 years, which fall within the planning horizon of many natural resources managers."
United States Department of Agriculture: http://www.usda.gov