The storm surge of Hurricane Katrina could have been mitigated had New Orleans' wetlands remained undeveloped. Now, citizens of the city's Lower Ninth Ward have begun the restoration of Bayou Bienvenue, which runs along the devastated neighborhood's northern border.

"e²: the economies of being environmentally conscious" is an ongoing PBS documentary series about solutions to the world's most pervasive environmental challenges. The series continues its flagship coverage of sustainable architecture with "e² design season three," featuring innovations in green building and planning from around the globe. Check your local PBS listings for television broadcast dates in your area.

The "e²" series and its video podcasts are produced by kontentreal, and distributed within the United States by PBS. More information is available at pbs.org/e2/ and e2-series.com/