e2 | PBS

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.

During his tenure as mayor of Bogota, Colombia, Enrique Penalosa was both revered and scorned for his urban planning and transportation policies. His public works projects, which largely favored the pedestrian experience, were unlike anything previously built in Bogota. Penalosa describes the environmental and social importance of minimizing automobile culture.

Architect Thom Mayne describes his philosophy toward sustainability and design. Mayne, a Pritzker Prize-winner and the architect of the San Francisco Federal Building, is a maverick and a leader in his field. He believes that people will have to adapt to new, sustainable building designs now and into the future.

The Druk White Lotus School was constructed despite challenges ranging from financing, to Ladakh, India's harsh climate and remote location. The school's founder, His Holiness The Twelfth Gyalwang Drukpa, describes how the school was built in stages, while architect Jonathan Rose discusses the plethora of fundraising sources used for expansion.

A process called "carbon sequestration" may one day allow the United States and other countries to burn abundant coal reserves without emitting greenhouse gases. But the technology is far from complete, and some skeptics question its ability to effectively capture carbon dioxide. Learn more about the carbon capture process from leading researchers in the field.

Terry Tamminen, a policy advisor to California Governor Arnold Schwarzenegger on energy and environmental issues, helped draft much of the state's forward-thinking environmental policy. Tamminen discusses California's achievements, and the imperative of new laws and policies that promote sustainabile practices.

The production of ethanol and other biofuels requires many of the same resources - such as arable land - as the production of food. As the biofuel industry expands in the United States and abroad, there is increasing question of how food production will be impacted. Experts discuss the tension between these two industries in Brazil and the United States, the world's two largest ethanol producers.

Learn how ultra-lightweight materials are playing an increasingly crucial role in automobile design as manufacturers try to design more efficient vehicles. Jon Fox-Rubin, the president and C.E.O. of Fiberforge, demonstrates his company's production process for lightweight carbon fiber composites that will be used by the automotive industry.

Muhammad Yunus - the founder of the Grameen Bank and a Nobel Peace Prize-winner - describes his philosophy toward poverty, and how energy access can play a major role in poverty alleviation.

Learn how wind turbines are manufactured at the Suzlon Rotor Corporation in Pipestone, Minnesota, which supplies turbines to the state's rapidly expanding community-owned wind farms.

Meet maverick designer Cameron Sinclair, whose "design like you give a damn" credo was an inspiration for the e2 series.

Tad Fettig, the director of the e2 series, shares his perspectives on filming in China as this sleeping giant of industry, technology and consumer demand awakens in the 21st century.

A closer look at how much energy is used and how much pollution is created by construction. The impact on our environment is staggering.

Thirty years ago in Freiburg, Germany, the "Green Movement" was born. Today the city serves as a model of environmental consciousness for architects, planners, and even politicians.

Learn more about the inspirational architect Sergio Palleroni, who is introducing sustainability to poor and underdeveloped communities around the world.