The United Nations Framework Convention on Climate Change (UNFCCC) is an international treaty that

• A. In 1972, the United Nations Conference on the Human Environment was held in Stockholm at the United Nations Conference on the Human Environment.
• B. In 1992 at the United Nations Conference on Environment and Development (UN Conference on Environment and Development) in Rio de Janeiro
• C. The World Summit on Sustainable Development was held in Johannesburg in the year 2002 (World Summit of Sustainable Development)
• D. United Nations Climate Change Conference (UN Climate Change Conference) held in A Copenhagen, 2009