The 1992 supplementary report was an update of the 1990 report , requested for the Framework Convention on Climate Change at the Earth Summit ( United Nations Conference on Environment and Development ) in Rio de Janeiro in 1992 . The 1992 supplementary report was an update , requested in the context of the negotiations on the Framework Convention on Climate Change at the Earth Summit ( United Nations Conference on Environment and Development ) in Rio de Janeiro in 1992 .