Some of the nation’s top museums are facing calls to sever all ties with billionaire funders who profit from global warming. In an open letter, a coalition of climate scientists and environmental groups says science and natural history museums should no longer accept money from fossil fuel corporations and individual donors like the Koch brothers. The brothers’ Koch Industries has extensive energy industry holdings and has funded climate denial. David Koch is a board member of both the American Museum of Natural History and the Smithsonian National Museum of Natural History. The letter says: "When some of the biggest contributors to climate change and funders of misinformation on climate science sponsor exhibitions in museums of science and natural history, they undermine public confidence in the validity of the institutions responsible for transmitting scientific knowledge. This corporate philanthropy comes at too high a cost."