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Whether it's designing efficient skyscrapers, creating whole cities which aim to be carbon neutral or re-building out of the rubble created by natural disasters, architects are changing the way we experience the built environment, finding solutions to the ecological challenges -- big and small -- of the 21st century.

Water fresh from the tarp 

Architect Eric Olsen has designed a portable water purifier which he hopes will help save lives.

    Singapore highlights

    What is 'Design for Good' and are we doing enough of it? Our PVs debated the issue in Singapore.

    The floating ecopolis

    Where will future refugees of climate change live? On "The Lilypad," of course.

      Rebuilding lives

      Cameron Sinclair, co-founder of Architecture for Humanity, talks to Principal Voices about his design philosophy.

        China's new great wall

        Forget the "Bird's Nest" and the "Water Cube," China has a glittering new landmark in Beijing.

          Sustainable living 

          Eco-city guru Peter Head tells us the secrets of creating sustainable cities for the future.

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            Principal Voices on CNNI
            Principal Voices on CNNI

            CNN's Charles Hodson presented the second Principal Voices program: "Principal Voices: Design for Good" which aired in late August. Watch it here:

            Part 1: Designing for good Video
            Part 2: Open architecture network Video
            Part 3: Turning urban China green Video

            Daniel Libeskind

            His buildings are some of the most recognizable and radical designs of the early 21st century.

            Cameron Sinclair

            Bringing design to some of the world's most impoverished and disaster-hit communities.

            Peter Head

            The award-winning architect is playing a leading role in the plans to build China's first eco-cities.

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