20,000 delegates are expected in U.S. for the Rio+20 Summit . Negotiations over a final document that would be signed by leaders when they flew in dragged on until the last moment because countries could not agree on many of the more polemic issues . The conference is aimed at promoting economic growth and poverty reduction . Preserving the planet 's resources also a main topic of discussion . The Rio de Janeiro delegation is headed by Secretary of United Nations Rio de Janeiro .
20,000 delegates are expected in U.S. for the Rio+20 Summit . The conference is aimed at promoting economic growth and poverty reduction . Preserving the planet 's resources also a main topic of discussion . The Rio de Janeiro delegation is headed by Secretary of United Nations Rio de Janeiro .