In 2015, an open letter to museums from 36 members of the scientific community demanded that the Smithsonian and other museums cut any ties with the Kochs, because of worries that they would remove information on climate change. The Smithsonian countered by stating both exhibits in question did examine in great detail the impacts of climate change. The Koch Foundation responded they "have pledged or contributed more than $1.2 billion dollars to educational institutions and cultural institutions, cancer research, medical centers, and to assist public policy organizations."