Science, Awareness and Solutions at the Earth Institute, Columbia University Directory entry at the Department of Earth and Environmental Sciences, Columbia University Directory entry at the NASA Goddard Institute for Space Studies James Hansen on C-SPAN James Hansen - Scientific Reticence: A Threat to Humanity and Nature. Press Conference in Bonn during COP23, 2017-11-19 (24 min). From ClimateMatters.TV series of United Planet Faith and Science Initiative. 1941 births Living people American climatologists 21st-century American physicists Atmospheric physicists Carl-Gustaf Rossby Research Medal recipients Goddard Space Flight Center people Members of the United States National Academy of Sciences NASA people People from Denison, Iowa Science activists Sustainability advocates University of Iowa alumni Sierra Club awardees