IPCC First Assessment Report

IPCC First Assessment Report
Name	IPCC First Assessment Report
Date	1990
Publisher	Intergovernmental Panel on Climate Change
Language	English
Subject	Climate change assessment

IPCC First Assessment Report The IPCC First Assessment Report was a landmark 1990 assessment produced by the Intergovernmental Panel on Climate Change that informed international negotiations and scientific debate. It summarized knowledge on climate change from multiple studies and expert groups and directly influenced the creation of the United Nations Framework Convention on Climate Change and the agenda at the United Nations Summit for Environment and Development. The report linked scientific research, intergovernmental diplomacy, and policy institutions across Geneva, New York City, and Paris in the late 1980s and early 1990s.

Background and formation

The assessment emerged from initiatives led by the World Meteorological Organization and the United Nations Environment Programme that convened scientists from institutions like Hadley Centre for Climate Prediction and Research, National Aeronautics and Space Administration, National Oceanic and Atmospheric Administration, Lawrence Livermore National Laboratory, and Max Planck Institute; it was prepared under the auspices of the United Nations and guided by officials from Sweden, United Kingdom, United States, Japan, and Germany. Key meetings took place in venues such as Villach and Bellagio, following earlier syntheses like the Charney Report and building on data from projects including the Global Atmospheric Research Programme and the World Climate Research Programme. Steering committees drew contributors from universities such as University of Cambridge, Massachusetts Institute of Technology, Columbia University, University of Tokyo, and University of Colorado.

Assessment process and Working Groups

The report was structured by three Working Groups modeled on scientific divisions used in assessments by agencies such as National Academy of Sciences and convened authors from research centers including NCAR, Scripps Institution of Oceanography, CSIRO, Potsdam Institute for Climate Impact Research, and ETH Zurich. Working Group I addressed physical science with contributors from Lamont–Doherty Earth Observatory and Jet Propulsion Laboratory; Working Group II considered impacts and adaptation drawing on experts from Imperial College London and Stockholm Environment Institute; Working Group III examined mitigation options with participation from OECD analysts and European Commission advisers. The drafting process involved review editors and external reviewers nominated by member governments such as France, India, Brazil, Australia, and China and was coordinated through IPCC bureaus chaired by representatives from Canada and Netherlands.

Key findings and conclusions

The report concluded that increasing concentrations of greenhouse gases—notably carbon dioxide, methane, and nitrous oxide—were projected to produce a measurable warming of the troposphere and changes in precipitation patterns over the twenty‑first century, citing model simulations from groups at Hadley Centre, GFDL, GISS, CCCma, and MPI. It stated that human activities identified by studies from IPCC lead authors were likely contributing to observed temperature trends and warned of potential impacts on systems studied at IPCC Working Group II institutions such as FAO and WHO. The Summary for Policymakers presented probabilistic language that informed negotiators at the Berlin Mandate and was used in drafting the text of the United Nations Framework Convention on Climate Change.

Scientific methods and data sources

Methodologies combined general circulation models developed at National Center for Atmospheric Research, Geophysical Fluid Dynamics Laboratory, and Met Office with observational datasets from NOAA satellites, ERS satellites, HadCRUT temperature dataset, paleoclimate reconstructions from PAGES researchers, and oceanographic records from WOCE. The assessment reviewed radiative forcing calculations by researchers associated with IPCC authors and analytical techniques from laboratories such as Argonne National Laboratory and Oak Ridge National Laboratory. Paleoclimate evidence cited work on ice cores from Greenland, Antarctica, and sediment cores from programs like ODP and IODP.

Political reception and influence

Governments and negotiators from delegations including European Community, United States Senate, Soviet Union, India Ministry of Environment, and Brazilian Ministry of Science and Technology used the report in forums at Rio de Janeiro and in preparatory talks for the United Nations Conference on Environment and Development. The report shaped positions of international institutions such as the World Bank, International Monetary Fund, and Organisation for Economic Co-operation and Development on climate finance and research priorities. Non‑governmental organizations including Greenpeace, WWF, and Friends of the Earth mobilized the report’s conclusions in advocacy campaigns, while industry groups like the International Petroleum Industry Environmental Conservation Association responded with alternative briefings.

Criticisms and controversies

Critics from research centers including some at University of Alabama in Huntsville and commentaries in outlets associated with policy actors in United States and Australia challenged aspects of the report’s attribution statements and model projections, citing uncertainties identified by authors linked to climate sensitivity estimates and feedback processes studied at Scripps Institution of Oceanography and NCAR. Some national delegations debated wording in the Summary for Policymakers during IPCC plenaries in Geneva and Madrid, leading to tensions between scientists and diplomats from Saudi Arabia and Canada. Academic critiques referred to data gaps in early satellite temperature records from MSU and to paleoclimate interpretations by researchers at Lamont–Doherty Earth Observatory.

Legacy and impact on climate policy

The First Assessment Report is credited with catalyzing the negotiation of the United Nations Framework Convention on Climate Change and influencing subsequent assessments by the Intergovernmental Panel on Climate Change through improved models at Hadley Centre and expanded author networks including IPCC AR4 and IPCC AR5 contributors. It stimulated funding decisions by agencies such as National Science Foundation, European Research Council, Natural Environment Research Council, and multilateral funds administered by the Global Environment Facility. The report’s synthesis helped institutions like UNFCCC Secretariat, Green Climate Fund, and national ministries in Germany, Japan, United Kingdom, and Canada to develop mitigation and adaptation strategies that continue to shape international climate governance.

Category:Intergovernmental Panel on Climate Change