Since the Rio Earth Summit in 1992, individual youth have been participating in international negotiations related to different environmental and sustainable development issues. With the formation of the European Youth Forum in 1996, and the U.S. youth organization SustainUS in 2001, youth-run organizations began to send delegations of youth to actively participation in these various worldwide negotiations, principally through the United Nations. Individual youth had been participating in the United Nations Framework Convention on Climate Change, and with the new level of youth organization participation in international negotiations, youth organizations began to identify the UN climate negotiations as a new forum to increase youth participation in.