“Climate change, once considered an issue for a distant future, has moved firmly into the present.”2018 was the fourth-hottest year on record. In the last 30 years, we’ve seen 20 of the hottest years ever recorded; nine of the ten deadliest heat waves in human history have occurred since 2000.
The Fourth National Climate Assessment (NCA4) Volume II provides a thorough examination of the effects of climate change on the United States. It focuses on the human welfare, societal, and environmental elements of climate change and variability for 10 regions and 18 national topics, with particular attention paid to observed and projected risks, impacts, consideration of risk reduction and implications under different mitigation pathways. The report provides examples of actions underway in communities across the United States to reduce the risks associated with climate change, increase resilience and improve livelihoods.