This report had effects not only on the establishment of the UNFCCC, but also on the first session of the Conference of the Parties (COP), held in Berlin in 1995.
The 1992 supplementary report was an update, requested in the context of the negotiations on the UNFCCC at the Earth Summit (United Nations Conference on Environment and Development) in Rio de Janeiro in 1992.
Negotiations occur over wording to ensure accuracy, balance, clarity of message, and relevance to understanding and policy.
However, in Shanghai, it appeared that there were attempts to blunt, and perhaps obfuscate, the messages in the report, most notably by Saudi Arabia.
After much debate, the following was carefully crafted: "In the light of new evidence, and taking into account the remaining uncertainties, most of the observed warming over the last 50 years is likely to have been due to the increase in greenhouse-gas concentrations.