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Engineer, Martha Garcia-Wegener, teaches students about her role in as an engineer in an environmental effects testing lab. She teaches students how altitude, temperature and humidity interact and... 03:01
Full Program: An investigation into America's energy landscape and what can be done to save our planet. 01:56:19
www.pbs.org/wgbh/nova/extremei... Remarkable time-lapse footage by James Balog, one of the world’s foremost nature photographers, reveals massive glaciers and ice sheets splitting apart,... 01:29
Full Program: Alaska is warming up. It's now a few degrees warmer than it was a century and a half ago, and the trend seems to be accelerating. 55:44
NASA Study Links Extreme Summer Heat to Climate Change 05:24