In this podcast, glaciologist Lonnie Thompson describes why global warming and melting glaciers could impact everything from drinking water supplies to the spread of infectious disease—and even political issues like refugees and terrorism. Podcast produced by David Levin. Interview by Dana Rae Warren. NOVA is produced by WGBH in Boston. Funding for NOVA is provided by ExxonMobil, David H. Koch, the Howard Hughes Medical Institute, the Corporation for Public Broadcasting, and public television viewers.