The Fourth National Climate Assessment, Volume II: Impacts, Risks, and Adaptation in the United States, is a comprehensive report on the current and projected impacts of climate change on the United States. This report was produced by the U.S. Global Change Research Program, a federal program that coordinates and integrates federal research on global change. The report assesses the risks and impacts of climate change on a wide range of sectors, including human health, water resources, agriculture, energy, transportation, and ecosystems.