NOVA | Dimming the Sun | PBS The Contrail Effect Are vapor trails from aircraft influencing the climate, and if so, should we worry? The Producer's Story Filmmaker David Sington offers his personal take on why many people remain skeptical about global warming. Join the discussion. Page 1 of 2 Discoveries in Global Dimming From an 18th-century volcanic eruption to a 21st-century satellite, see what paved the way to our understanding of this phenomenon. TV Program Description Airing on PBS Tuesday August 5 at 8 pm Check local listings as dates and times may vary. Links & Books Teacher's Guide Clean Air Technologies Explore a handful of creative solutions to help reduce pollution, like exhaust-eating algae and wind energy. Program Transcript Buy the Video/DVD Watch a Preview Credits Don't miss upcoming NOVA broadcasts and companion Web sites—subscribe to our email bulletin. Support authoritative science programming like NOVA by making a pledge to your local PBS station today. Pledge now. http://www.pbs.org/wgbh/nova/sun/ This Web site was produced for PBS Online by WGBH. Web site © 1996-2006 WGBH Educational Foundation Funding for NOVA is provided by David H. Koch, the Howard Hughes Medical Institute, the Corporation for Public Broadcasting, and public television viewers. 5/30/2008 NOVA | Dimming the Sun | PBS Page 2 of 2 Corporate funding provided by http://www.pbs.org/wgbh/nova/sun/ 5/30/2008