Biophilia is a hypothesis that describes humans as emotionally connected to all other living systems. Jonathan Rose, a New York City-based real estate developer, describes how biophilia can guide building design in dense urban environments. In many instances, biophilia shares the same principles as sustainable building design.

"e²: the economies of being environmentally conscious" is an ongoing PBS documentary series about solutions to the world's most pervasive environmental challenges. The 2007 season continues with "e² design season two", the flagship sustainable architecture series examining 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/

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