US Secretary of State Addresses the UN's Rio+20

US Secretary of State Addresses the UN's Rio+20

Antonio Scorza/AFP/Getty Images

US Secretary of State Hillary Clinton delivers a speech during a plenary session of the UN Conference on Sustainable Development, Rio+20, in Rio de Janeiro, Brazil, on June 22, 2012. World leaders attending the UN summit in Rio weighed steps to root out poverty and protect the environment as thousands of activists held several protests to denounce Amazon rainforest deforestation, the plight of indigenous peoples and the "green economy" being advocated at the UN gathering.