The United Nations Conference on Environment and Development, also known as the Rio de Janeiro Earth Summit, was a major UN conference held in Rio de Janeiro in 1992. It was the largest gathering of world leaders at the time, with 117 heads of state in attendance. The Earth Summit aimed to establish a new partnership for sustainable development through international agreements. It produced several long-term reports and plans, including Agenda 21, and led to the establishment of the Convention on Biological Diversity and the UN Framework Convention on Climate Change. The most significant outcome was Agenda 21, a 700-page work program for sustainable development across many areas.