Rio+20 Conference on Sustainable Development, "Rio+20," will be held in Rio de Janeiro, Brazil, from June 20-22, 2012. The conference will be preceded by the third Preparatory Committee meeeting of the Conference from June 13-15. Registration is now open and will close on May 20. All attendees must be registered by the UN Observers, Rosalee Keech (firstname.lastname@example.org). For information on the conference, please link to http://www.uncsd2012.org/registration.