Climate Science Special Report
Fourth National Climate Assessment (NCA4), Volume I
This report is an authoritative assessment of the science of climate change, with a focus on the United States. It represents the first of two volumes of the Fourth National Climate Assessment, mandated by the Global Change Research Act of 1990.

View the interactive website Climate Science Special Report

John Stewart
Editor, OutdoorWire.com
Resources Consultant, California Four Wheel Drive Association
Board of Directors, BlueRibbon Coalition