Rio+20 Earth summit on 20 June - in pictures

Secretary general of Rio+20 Sha Zukang, left, and UN secretary general Ban Ki-moon , centre, applaud as Brazil's president Dilma Rousseff attends the opening of the United Nations sustainable development summit in Rio de Janeiro Photograph: Sergio Moraes/Reuters

Delegates arriving at the Rio+20 summit walk past activists. Dozens of activists representing more than 100 NGOs protested inside the Rio+20 convention centre against the tentative agreement reached at the conference Photograph: Victor R. Caivano/AP

New Zealand's Brittany Trilford, 17, winner of global video speech contest Date With History, speaks during the opening Photograph: ANTONIO LACERDA/EPA

Two Drylands ambassadors for the UN Convention to Combat Desertification (UNCCD) – Dr Dennis Garrity (senior research fellow at the World Agroforestry Centre) and Miss Universe 2011 Leila Lopes – hold a credit card to pay the UN for their air travel carbon emissions Photograph: Victor R. Caivano/AP

Protesters gather in the decades-old Vila Autodromo squatter settlement in Rio de Janeiro, Brazil. Residents of the favela are facing possible eviction for construction of an Olympic park in the area. Evictions are occurring in slums throughout the city amid preparations for the 2014 World Cup and 2016 Olympics. The protesters oppose Brazil's Amazon forest policies, including the controversial Belo Monte dam project Photograph: Buda Mendes/Getty Images

Brazilian indigenous chief Raoni of the Kaiapo nation takes part in a march near the RioCentro convention centre Photograph: Antonio Scorza/AFP/Getty Images

Ban Ki-moon delivers a congratulatory speech during a ceremony to sign a pact to upgrade a Seoul-established green growth thinktank into an official international organisation. The 15 signatories of the GGGI convention are South Korea, Denmark, Australia, Ethiopia, Cambodia, Costa Rica, Guyana, Kiribati, Norway, Paraguay, Papua New Guinea, Qatar, Britain, the United Arab Emirates and Vietnam Photograph: YONHAP/EPA

Thousands of people demonstrate on a march in Rio de Janeiro Photograph: Christophe Simon/AFP/Getty Images

Activists take part in the march along Rio Branco avenue Photograph: Vanderlei Almeida/AFP/Getty Images

An official photo with heads of state and delegations during the opening of the conference Photograph: Buda Mendes/STF/Getty Images

An activist dressed as a clown lies on a huge Brazilian flag Photograph: Felipe Dana/AP

Argentinian president Cristina Fernández, second from left, waves to Brazilian president Dilma Rousseff, second from right, during the group photo Photograph: Victor R. Caivano/AP

Activists push an inflatable globe during a march as part of the People's Summit for Social and Environmental Justice in Defense of the Commons, a parallel event during the UN conference Photograph: Felipe Dana/AP

Chinese president Hu Jintao, left, talks to Benin's president Boni Yayi before the group photo Photograph: Victor R. Caivano/AP

Indians from the state of Acre take part in a protest march Photograph: CHRISTOPHE SIMON/AFP/Getty Images

Ecuadorean president Rafael Correa is seen on a screen as he speaks about the Yasuni-ITT Initiative during a meeting Photograph: Victor R. Caivano/AP

An activist holds a banner with the portrait of Argentine-born revolutionary leader, Ernesto "Che" Guevara, reading "Republic or death. Together we will be victorious!" Photograph: Christophe Simon/AFP/Getty Images

Turkey's prime minister Recep Tayyip Erdogan, left, shakes hands with Ali al-Shukri, minister of planning of Iraq and Arab League chair, right, as Iranian president Mahmoud Ahmadinejad talks to them Photograph: Victor R. Caivano/AP

A samba dancer takes part in the protest march Photograph: Christophe Simon/AFP/Getty Images

Portuguese prime minister Pedro Passos Coelho, right, and Spanish PM Mariano Rajoy speak after posing for the group photo Photograph: Victor R. Caivano/AP

Activists carry cardboard surfboards on the protest march Photograph: CHRISTOPHE SIMON/AFP/Getty Images

The march passes along Rio Branco in Rio de Janeiro Photograph: VANDERLEI ALMEIDA/AFP/Getty Images