Róisín Commane, an atmospheric scientist at Columbia’s Lamont-Doherty Earth Observatory, and her colleagues have discovered surprising levels and unexpected types of pollution that seem to be originating in Africa.

The current megadrought in the American West may be one of the most severe in the past 1200 years—and research by Columbia bioclimatologist Park Williams found climate change is partially to blame.

Yutian Wu, an atmospheric scientist at Lamont-Doherty Earth Observatory, received funding from the Center for Climate and Life to investigate whether the loss of Arctic sea ice promotes severe weather over North America.

John Furlow, Deputy Director for Humanitarian Assistance and International Development of the International Research Institute for Climate and Society, discusses climate threats to trade, supply chains, national security, and other areas.

Upmanu Lall is director of the Columbia Water Center and the lead author of the new U.S. National Climate Assessment’s chapter on water resources. In this interview, he discusses the outlook for water supplies, quality, and infrastructure.