In what year did the United Nations Framework Convention on Climate Change (UNFCCC) commence?

The United Nations Framework Convention on Climate Change (UNFCCC) officially commenced in 1994. This year marks the point at which the treaty entered into force after being adopted on May 9, 1992, in Rio de Janeiro during the Earth Summit. The primary objective of the UNFCCC is to stabilize greenhouse gas concentrations in the atmosphere to prevent dangerous anthropogenic interference with the climate system. While the initial adoption took place in 1992, the implementation began only after a sufficient number of countries ratified the treaty, making 1994 a significant milestone in international climate governance. Other years listed do not correspond with the commencement of the Convention or the adoption process, as they either precede the Convention's entry into force or are post-implementation years.