An indigenous child from Kayapo tribe attends first indigenous assembly for the Rio+20 Conference at Kari-Oca village in Rio de Janeiro, on June 14, 2012. Indigenous people from around the world are visiting the village for the Rio+20 United Nations Conference on Sustainable Development. #

People view an exhibition in the TEDxRio+20 forum at the Copacabana Fort in Rio de Janeiro, on June 13, 2012. The TEDxRio+20 forum is a parallel event of the Rio+20 United Nations sustainable development summit. #

A fake life-sized war tank, covered by bread, displayed in the Santa Marta slum as part of a "Bread not Bombs" protest on the sidelines of the Rio+20 UN Conference in Rio de Janeiro, on June 19, 2012. Activists placed the tank covered with bread for residents to eat, protesting military spending and demand that military spending be redirected for basic needs. #

Hundreds of people make a human banner that reads "Rivers for life" in Portuguese, on Flamengo beach on the sidelines of the Rio+20 conference in Rio de Janeiro, on June 19, 2012. The activists are calling attention to threats posed to rivers, forests and livelihoods by large hydroelectric dams, like the Belo Monte hydroelectric plant being constructed in Brazil's Amazon. #

A woman takes pictures of cubes with surnames from all over the world at an exhibition in Rio de Janeiro's Copacabana's Fort, organized by Brazilian industrialists in the framework of the UN Rio+20 conference, on June 13, 2012. #

Brazilian artist Vik Muniz poses for a photo as he lies on his "Landscape" project that uses waste material to recreate the image of Guanabara Bay in Rio de Janeiro, on June 16, 2012. Muniz's project recreates city landmarks with recyclable materials donated by the public, who will be able to take their waste to the installation's tent between June 15 and 22. #

An indigenous man from the Pataxo tribe attends an assembly at Kari-Oca village in Rio de Janeiro, on June 15, 2012. Indigenous people from many countries will be seated in the village for the Rio +20 conference. #

Sugarloaf mountain, silhouetted during a fiery sunrise in Rio de Janeiro, the host city for the United Nations Conference on Sustainable Development, on June 18, 2012. #

Volunteers wearing masks hold up signs next to a table displaying empty plates and flags representing the problem of hunger in those countries during a protest organized by members of non-government organization (NGO) "Rio de Paz" (Peace Rio) at Copacabana beach ahead of the Rio+20 conference, on June 19, 2012. Rio de Paz hopes to press world leaders for better conditions for poor people. #

A protester shows her hand covered with paint during a demonstration where people threw red paint on the wall of the building belonging to Brazil's Vale SA mining company, in Rio de Janeiro, on June 19, 2012. The protesters, who say they represent social movements, unions and communities impacted by industrial development, are demonstrating during the United Nations Rio+20 conference. #

Environmental activists march during a demonstration against the forest code and the Belo Monte Hydroelectric plant construction, in Rio de Janeiro's downtown, on June 18, 2012. #

An indigenous man wears a sticker on his headgear protesting against the United Nations' REDD program for the reduction of emissions from deforestation in developing countries during the People's Summit at Rio+20, on June 19, 2012. #

Rio de Janeiro's Mayor Eduardo Paes, left, waves as he walks with New York's Mayor Michael R. Bloomberg, in green tie, as they visit the Chapeu Mangueira slum during the Rio+C40: Megacity Mayors Taking Action on Climate Change, a parallel event during the Rio+20, on June 19, 2012. While squabbling between rich and poor countries threatens to derail the Earth summit, the world's mayors say they can't afford the luxury of endless, fruitless negotiations and are already taking real action to stave off environmental disaster and preserve natural resources for future generations. #

A man walks on garbage piled on the banks of Jacare river during a press tour at Manguinhos slum in Rio de Janeiro, on June 18, 2012. Non-governmental organization (NGO) "Rio de Paz" (Peace Rio) promoted a press tour at Manguinhos slum to show social and environmental problems ahead of Rio+20. #

A deforested section of Amazon rainforest, seen in the mist from an airplane at dawn in Para state, Brazil, on June 8, 2012. Although deforestation in the Brazilian Amazon is down 80 percent since 2004, environmentalists fear recent changes to the Forest Code will lead to further destruction. Around 20 percent of the rainforest has already been destroyed. #

A train operated by Vale, a mining company and Brazil's biggest exporter, crosses a bridge in Acailandia, Brazil, on June 9, 2012. The railroad transports iron ore from the world's largest mine on its way to a port to be exported. The 554-mile line uses a train comprised of 330 cars and four locomotives and is the main lifeline of the country's iron industry. The iron ore is used to produce pig iron, which is created in smelters fired by charcoal produced from illegally harvested Amazon rainforest wood. #

Construction continues at the Belo Monte dam complex in the Amazon basin near Altamira, Brazil, on June 15, 2012. Belo Monte will be the world's third-largest hydroelectric project and will displace up to 20,000 people while diverting the Xingu River and flooding as much as 230 square miles of rainforest. The controversial project is one of around 60 hydroelectric projects Brazil has planned in the Amazon to generate electricity for its rapidly expanding economy. #

Illegal burning clears brush and small trees in order to clear land for agriculture in an already deforested section of Amazon rainforest in Para state, Brazil, on June 11, 2012. The Brazilian Amazon, home to 60 percent of the world's largest forest and 20 percent of the Earth's oxygen, remains threatened by the rapid development of the country. The area is currently populated by over 20 million people and is challenged by deforestation, agriculture, mining, a governmental dam building spree, illegal land speculation including the occupation of forest reserves and indigenous land and other issues. #

The Xingu River flows near the area where the Belo Monte dam complex is under construction in the Amazon basin near Altamira, Brazil, on June 15, 2012. While environmentalists and indigenous groups oppose the dam, many Brazilians support the project. #

Indigenous people, small farmers, fisherfolk, and local residents occupy the Belo Monte Dam project to gather in formation to spell out the words that read in Portuguese "Stop Belo Monte," on the Xingu river, in the Brazilian state of Para, on June 15, 2012. The group was sending a message about the impacts of the dam to leaders who are gathering for Rio+20. #

Indigenous people, and local residents occupy the Belo Monte Dam project, removing a strip of earth to restore the river's natural flow during a protest on the Xingu river in the Brazilian state of Para, on June 15, 2012. #

An aerial view of Christ the Redeemer statue, lit up in green to celebrate the Rio+20 Conference on Sustainable Development in Rio de Janeiro in this June 14, 2012 photograph. #

A man runs on Botafogo beach near a brightly-lit sculpture made from plastic bottles, backdropped by a silhouette of Sugarloaf mountain in Rio de Janeiro, in the early morning hours of June 20, 2012. #

Indigenous people 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 Rio+20, in Rio de Janeiro, on June 18, 2012. #

Brazilian Bororo indians dance during the opening ceremony of the Indian Green Games in Kari-Oca indian village in Jacarepagua, Rio de Janeiro, on June 14, 2012 as part of the UN Rio+20 environmental summit. #