Brazilian army soldiers patrol the entrance of the Brazil Pavilion for the Rio+20 United Nations sustainable development summit in Rio de Janeiro

 
Brazilian army soldiers patrol the entrance of the Brazil Pavilion for the Rio+20 United Nations sustainable development summit in Rio de Janeiro
Brazilian army soldiers patrol the entrance of the Brazil Pavilion for the Rio+20 United Nations sustainable development summit in Rio de Janeiro June 19, 2012. More than 50,000 policymakers, environmentalists and business leaders from around the world are meeting in Rio de Janeiro this week for the U.N. Conference on Sustainable Development, marking the 20-year anniversary of the landmark Earth Summit that paved the way for the Kyoto agreement on greenhouse gases. The "Rio +20" United Nations Conference on Sustainable Development will be held from June 20 to June 22. REUTERS/Nacho Doce (BRAZIL - Tags: ENVIRONMENT POLITICS MILITARY)