An army shock troop dog handler holds back his dog as he faces demonstrators - indigenous people, the Landless People's Movement (MST) and other civil society groups - in front of the Riocentro United Nations conference. The demonstrators are kept out of earshot and invisible to the UN conference. The United Nations Conference on Sustainable Development (Rio+20), Rio de Janeiro, Brazil, 20th June 2012. Photo © Sue Cunningham.
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