Two decades after the United Nations Summit in Rio de Janeiro, over 130 world leaders will gather in the same Brazilian city on June 20 for Rio+20. In an exclusive interview with China Daily, Sha Zukang, the secretary general for the 2012 UN conference on sustainable development, set high expectations for Rio+20. The conference will also strengthen arrangements and mechanisms that integrate sustainable-development goals at the international, national and local levels.

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Reporter: Zhang Yuwei

Video: Derek Bosko

Photo Research: Liu Yiyi

Photos courtesy of United Nations Photos

Supervising Producer: Flora Yue, Calvin Zhou

Senior Producer: Larry Lee, Ji Tao