IPCC Assessment Reports

IPCC Assessment Reports
Name	IPCC Assessment Reports
Established	1988
Type	Scientific assessment
Jurisdiction	International
Parent agency	Intergovernmental Panel on Climate Change

IPCC Assessment Reports provide comprehensive evaluations of the scientific, technical, and socio-economic information relevant to the understanding of climate change, synthesizing literature from journals and institutions to inform international decision-making bodies. The reports are produced by scientists convened under the auspices of the United Nations and the World Meteorological Organization and have influenced policies associated with the United Nations Framework Convention on Climate Change, the Kyoto Protocol, and the Paris Agreement.

Overview and Purpose

The reports aim to assess evidence collated by scholars from institutions such as NASA, NOAA, European Space Agency, National Oceanic and Atmospheric Administration, and CSIRO to support negotiations involving parties to the United Nations Framework Convention on Climate Change, the G7, and the G20. They synthesize findings from journals like Nature (journal), Science (journal), Geophysical Research Letters, and databases maintained by organizations such as the World Bank, International Energy Agency, and Intergovernmental Science-Policy Platform on Biodiversity and Ecosystem Services. Primary purposes include informing policymakers in forums such as the Conference of the Parties, supporting assessments by panels like the Subsidiary Body for Scientific and Technological Advice, and guiding national agencies including the Environmental Protection Agency and the Department of Energy.

History and Development of Assessment Cycles

The assessment cycles began after the founding of the Intergovernmental Panel on Climate Change in 1988, an initiative of the United Nations Environment Programme and the World Meteorological Organization, with early influence from committees like the Royal Society and commissions chaired by figures who engaged with Brundtland Commission reports. Subsequent cycles have reflected inputs from working groups modeled after review processes used by the National Research Council, the Royal Society, and the Academia Europaea, with cross-references to regional assessments such as those by the European Environment Agency and national assessments like the US Global Change Research Program. Major milestones correspond to diplomatic outcomes at gatherings like the Earth Summit (1992), the Kyoto Conference (COP3), and the Paris Climate Conference (COP21).

Structure, Processes, and Methodology

Assessment reports are organized into contributions from three working groups and a synthesis report, using procedures influenced by review frameworks from the National Academy of Sciences, the Royal Society, and editorial standards of journals including PLOS Climate and Environmental Research Letters. Assessment authors are nominated by governments and observer organizations such as the World Health Organization, International Labour Organization, and International Renewable Energy Agency and undergo multi-stage review processes with expert reviewers from institutions like MIT, Stanford University, University of Oxford, Harvard University, and Peking University. Methodologies employ evidence evaluation similar to those of the Cochrane Collaboration and the IPBES assessment, incorporating detection and attribution techniques developed at centers such as Hadley Centre and Lawrence Berkeley National Laboratory and using scenarios like those from the Shared Socioeconomic Pathways and models from the Coupled Model Intercomparison Project.

Major Findings by Assessment Report

Each assessment cycle has produced findings on physical science, impacts, and mitigation comparable in influence to landmark reports by the Brundtland Commission and studies by James Hansen; earlier assessments emphasized greenhouse gas attribution linked to work at Scripps Institution of Oceanography and the Mauna Loa Observatory, while later reports integrated assessments of sea-level rise studied by NOAA, cryosphere changes documented at National Snow and Ice Data Center, and biodiversity implications highlighted by IUCN. Findings on carbon budgets and remaining emissions pathways drew on analyses from International Energy Agency, BP Statistical Review, and research teams at Princeton University and ETH Zurich, and conclusions about adaptation and vulnerability referenced reports by the World Bank, Asian Development Bank, and African Development Bank.

Impact on Policy and International Agreements

Assessment reports have directly influenced negotiations and instruments including the Kyoto Protocol, the Paris Agreement, and national pledges submitted as Nationally Determined Contributions, shaping policy decisions by entities such as the European Commission, the US Environmental Protection Agency, and the Ministry of Environment (India). They have been cited in rulings and advisory opinions involving courts such as the International Court of Justice and national supreme courts, and have guided investments by institutions like the Green Climate Fund, the Global Environment Facility, and multilateral development banks including the World Bank Group and the European Investment Bank.

Criticism, Controversies, and Revisions

Critiques have addressed issues raised by commentators associated with think tanks such as the Heritage Foundation and the Heartland Institute, scrutiny from investigative reports in outlets like The Guardian (news organization), The New York Times, and Reuters, and scientific debates involving authors from IPCC-participating institutions including University of East Anglia and Columbia University. Controversies over errors and corrections led to errata and procedural reforms endorsed by bodies such as the United Nations General Assembly and advisory panels including members from the InterAcademy Council and the World Meteorological Organization. Revisions have strengthened transparency, author selection, and review protocols in line with recommendations from the National Academy of Sciences and the Royal Society.

Category:Climate change organizations