Nova | Pbs

James Balog has been working as a nature photographer for more than 30 years. His latest project, the Extreme Ice Survey, is helping scientists document the rapid melt of glaciers worldwide--something he says is visible evidence of human-caused climate change. In this interview, he discusses his work. Podcast produced by David Levin. Interview by David Levin. 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. To learn more, go to pbs.org/nova/extremeice.