Alex Steffen:
亞力克斯•史蒂芬(Alex Steffen): 城市的共享未來

TEDGlobal 2011 · 10:13 · Filmed Jul 2011
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Planetary futurist
Alex Steffen explores our planet's future, telling powerful, inspiring stories about the hard choices facing humanity ... and our opportunity to create a much better tomorrow. Full bio
This talk was presented at an official TED conference, and was featured by our editors on the home page.



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