Rio de Janeiro will host the United Nations conference on sustainable development from June 20-22.
Rio +20 summit —
Rio de Janeiro will host the United Nations conference on sustainable development from June 20-22.
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Rio +20 Secretary General Sha Zukang, delivers a speech for World Environment Day in Brasilia, on June 5, 2012.
Rio +20 summit —
Rio +20 Secretary General Sha Zukang, delivers a speech for World Environment Day in Brasilia, on June 5, 2012.
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U.S. President George Bush addresses the UN-sponsored Earth Summit in June 1992 in Rio de Janeiro.
Rio +20 summit —
U.S. President George Bush addresses the UN-sponsored Earth Summit in June 1992 in Rio de Janeiro.
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French President François Mitterrand signs an "Earth pledge," during the 1992 Earth summit.
Rio +20 summit —
French President François Mitterrand signs an "Earth pledge," during the 1992 Earth summit.
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U.S. President George Bush looks aside as Cuban leader Fidel Castro passes in front of him at the 1992 summit. The two leaders did not greet each other.
Rio +20 summit —
U.S. President George Bush looks aside as Cuban leader Fidel Castro passes in front of him at the 1992 summit. The two leaders did not greet each other.
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Bill Clinton, then a Democratic presidential nominee, speaks at the 1992 summit in Rio.
Rio +20 summit —
Bill Clinton, then a Democratic presidential nominee, speaks at the 1992 summit in Rio.
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A Brazilian Indian of the Caiapo Indian tribe speaks on a public telephone outside Rio de Janeiro during a pause of the International Indigenous People Conference, part of the 1992 Earth summit.
Rio +20 summit —
A Brazilian Indian of the Caiapo Indian tribe speaks on a public telephone outside Rio de Janeiro during a pause of the International Indigenous People Conference, part of the 1992 Earth summit.
AFP/Getty Images