Irvine, Calif., Dec. 7, 2020 — In 2018, California wildfires caused economic losses of nearly $150 billion, or about 0.7 percent of the gross domestic product of the entire United States that year, and a considerable fraction of those costs affected people far from the fires and even outside of the Golden State. For a study published today in Nature Sustainability, researchers at the University of California, Irvine, China’s Tsinghua University and other institutions combined physical, epidemiological and economic models to gain a more comprehensive understanding of the impact of the blazes.