More than 50,000 delegates are expected in Rio de Janeiro for the Rio+20 conference . The conference is aimed at promoting economic growth and poverty reduction . Managing the country 's resources also a main topic of discussion . Why have I been inviting and urging leaders , heads of state and government ? The U.S. delegation is led by Secretary of State Hillary Clinton .
More than 50,000 delegates are expected in Rio de Janeiro for the Rio+20 conference . The conference is aimed at promoting economic growth and poverty reduction . Managing the country 's resources also a main topic of discussion . The U.S. delegation is led by Secretary of State Hillary Clinton .