Rio's Earth Summit Bigger Than Liechtenstein

Indigenous squeeze into a subway train as they ride to the People's Summit for Social and Environmental Justice in defense of the commons, a parallel event taking place alongside the United Nations Conference on Sustainable Development, or Rio+20, in Rio de Janeiro, Brazil, Monday June 18, 2012. The Earth summit runs through June 22, with three final days of high-profile talks among some 130 top leaders from nations around the globe. Close

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Indigenous squeeze into a subway train as they ride to the People's Summit for Social and Environmental Justice in defense of the commons, a parallel event taking place alongside the United Nations Conference on Sustainable Development, or Rio+20, in Rio de Janeiro, Brazil, Monday June 18, 2012. The Earth summit runs through June 22, with three final days of high-profile talks among some 130 top leaders from nations around the globe.

The Rio+20 Summit is the biggest-ever conference organized by the United Nations, said Pragati Pascale, the lead spokeswoman for the meeting in Rio de Janeiro. The UN issued 45,381 passes for the Riocentro conference center. That includes 10,822 passes for national delegations; 9,856 passes for NGOs and the Major Groups (What's a Major Group?); and 4,075 for media. Security personnel took up another 4,000. Thousands more observers attended conference and the "Dialog Days" held in the run up to the arrival of the world leaders.

By comparison, the 1992 Rio Earth Summit had about 17,000 participants.

Landberg is renewble energy editor for Bloomberg News.

Read complete Bloomberg News coverage of the UN Rio+20 Conference on Sustainable Development.

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