Highlights past, current and projected climate trends
U.S. Global Change Research Program’s (USGCRP) Climate Science Special Report (CSSR), which serves as Volume I of the Fourth National Climate Assessment (NCA4), describes current trends in the climate globally and for the U.S., and projects trends in temperature, precipitation, sea-level rise and Arctic sea ice for the remainder of this century.
![Motorists being warned of severe drought conditions with electronic road signs along U.S. Highway 50 in Sacramento, California. Taken August 5, 2015. (Image credit: iStock image) Motorists being warned of severe drought conditions with electronic road signs along U.S. Highway 50 in Sacramento, California. Taken August 5, 2015.](/sites/default/files/styles/landscape_width_1275/public/legacy/image/2019/Jun/PHOTO-Severe%20Drought%20Highway%20Sign-iStock-483412336-1125x534-Landscape.jpg?itok=Rcslgb0o)
Motorists being warned of severe drought conditions with electronic road signs along U.S. Highway 50 in Sacramento, California. Taken August 5, 2015. (Image credit: iStock image)