World leaders poured into Rio de Janeiro on Wednesday , 20 years after the landmark Earth Summit , to commit themselves to a new roadmap for sustainable development -- with that roadmap already under fire for failing to set firm goals . More than 50,000 delegates are expected in Rio de Janeiro for the Rio+20 Summit . The conference is aimed at promoting economic growth and poverty reduction . It will be held from June 12 to 14, with a final day on Saturday. The U.S. delegation is headed by Secretary of State Hillary Clinton .
More than 50,000 delegates are expected in Rio de Janeiro for the Rio+20 Summit . The conference is aimed at promoting economic growth and poverty reduction . It will be held from June 12 to 14, with a final day on Saturday. The U.S. delegation is headed by Secretary of State Hillary Clinton .