Layla Zulfa
PATHUM, Thailand – As the global community grapples with the accelerating realities of a warming planet, nearly 200 of the world’s foremost climate scientists, economists, and policy experts have converged at the Asian Institute of Technology in Pathum, Thailand. From September 28 to October 1, this high-level assembly is dedicated to a singular, critical mission: drafting the Working Group III contribution to the Intergovernmental Panel on Climate Change (IPCC) Seventh Assessment Report (AR7).
The focus of this session—mitigation of climate change—represents one of the most complex challenges in modern governance. By assessing the latest scientific evidence on emissions pathways, technological innovations, and socio-economic policies, these experts are laying the foundation for what will become the definitive scientific guide for global climate action for the coming decade.
The Core Mandate: Bridging Science and Policy
The meeting in Thailand marks a pivotal moment in the AR7 cycle. Following the First Joint Lead Author Meeting held in Paris in late 2025, the experts are now moving from the conceptual phase to the rigorous task of drafting specific chapters.
Working Group III, one of the three pillars of the IPCC, is tasked with analyzing the scientific, technical, and socio-economic literature surrounding climate mitigation. Their mandate is not merely to describe the state of the climate, but to identify the specific tools and policies available to stabilize greenhouse gas emissions.
"As policymakers around the world consider climate action, they have many questions about mitigation opportunities and challenges," said Joy Pereira, Co-Chair of IPCC Working Group III. "This meeting brings together leading experts to assess the latest evidence on pathways, technologies, and policies that can support effective and equitable emissions reductions. Our task is to provide policymakers with a clear and authoritative assessment of the options available to address climate change."
The scope of their assessment is vast, spanning every sector of the modern economy, including energy systems, industrial processes, transportation, infrastructure, urban development, agriculture, and land use. Crucially, the report will also examine the "enabling conditions" necessary for success: the role of international climate finance, the transfer of green technology, robust governance, and the often-contentious links between emissions mitigation, sustainable development, and the pursuit of a "just transition" for workers and vulnerable populations.
Chronology: The Evolution of the Seventh Assessment Cycle
The Seventh Assessment cycle is the most ambitious in the IPCC’s history, reflecting the urgency of the climate crisis and the evolving landscape of international policy.
- July 2023: The cycle formally commenced in Nairobi with the election of new Bureau members, setting the administrative stage for the years ahead.
- January 2024: During the 60th Plenary Session in Istanbul, the IPCC confirmed the scope of the AR7, formally committing to the three Working Group reports and a final Synthesis Report, scheduled for release in late 2029.
- July–August 2024: In Sofia, Bulgaria, the Panel defined the parameters for specialized reports, including the highly anticipated Special Report on Climate Change and Cities and a new Methodology Report on Short-lived Climate Forcers.
- February 2025: At the 62nd Plenary Session in Hangzhou, China, the outlines for the primary Working Group reports were finalized, providing the roadmap for the authors currently gathered in Pathum.
- October 2025: The 63rd Plenary Session in Lima, Peru, established the 2026 workplan and approved the scientific content for the upcoming 2027 Methodology Report on Carbon Dioxide Removal (CDR) and Carbon Capture, Utilization, and Storage (CCUS).
- September 2028: The current Second Lead Author Meeting in Pathum, Thailand, serves as the engine room for the drafting of the First-Order Draft.
This structured progression ensures that the IPCC remains responsive to current scientific findings while maintaining the methodical, peer-reviewed rigor that has defined the organization since its inception in 1988.
Supporting Data: Why the IPCC Matters
The IPCC was founded by the World Meteorological Organization (WMO) and the United Nations Environment Programme (UNEP) to provide political leaders with objective, scientific information. In an era of disinformation, the IPCC’s value proposition lies in its unique process: it does not conduct its own research but rather synthesizes thousands of peer-reviewed papers annually, offering a comprehensive summary of what is known.
The Three Pillars of Assessment
The IPCC’s work is divided into three distinct working groups, each focusing on a specific dimension of the climate crisis:
- Working Group I (Physical Science Basis): Analyzes the causes and future projections of climate change, including atmospheric, oceanic, and terrestrial shifts.
- Working Group II (Impacts, Adaptation, and Vulnerability): Assesses how climate change affects ecosystems and human societies and how these entities can adapt to changing conditions.
- Working Group III (Mitigation of Climate Change): Investigates the pathways to reduce or prevent the emission of greenhouse gases.
This comprehensive approach provides governments at all levels—from local municipalities to international coalitions—with the raw, evidence-based data required to draft effective legislation. The synthesis of this data is a key input for high-stakes international negotiations, such as those held under the United Nations Framework Convention on Climate Change (UNFCCC).
The Review Process: Ensuring Scientific Integrity
Transparency is the bedrock of the IPCC. Following the conclusion of the Pathum meeting, authors will synthesize their discussions into a "First-Order Draft." This document is not final; it is merely the beginning of an intensive, multi-stage review process.
"The strength of the IPCC lies in its rigorous and transparent assessment process," explains Kate Calvin, Co-Chair of IPCC Working Group III. "The First-Order Draft review allows experts from around the world to contribute their knowledge and perspectives, helping ensure that the report reflects the breadth of available evidence and meets the highest scientific standards."
The review process involves two primary tiers:
- Expert Review: Researchers from across the globe are invited to critique the draft, ensuring that the report addresses the latest scientific breakthroughs and fills any gaps in current knowledge.
- Government and Expert Review: Following the expert review, the report undergoes a secondary review where both governments and experts provide feedback, ensuring that the findings are policy-relevant and grounded in real-world feasibility.
Every expert reviewer who provides feedback is formally acknowledged in the published report, reinforcing the collaborative and inclusive nature of the project.
Implications: Preparing for the Future
The implications of the AR7 report are profound. As the global economy undergoes a transformation—transitioning away from fossil fuels and toward renewable energy, sustainable land management, and circular industrial processes—the guidance provided by Working Group III will be instrumental.
The inclusion of the Special Report on Climate Change and Cities reflects a growing recognition that urban centers are both primary drivers of emissions and the most vulnerable sites for climate-related impacts. Similarly, the focus on Carbon Dioxide Removal (CDR) and Short-lived Climate Forcers (such as methane) indicates that the IPCC is refining its focus on technologies and strategies that can deliver immediate, short-term climate gains while long-term decarbonization efforts take root.
As the authors in Pathum continue their work, the world watches with bated breath. The data produced in this cycle will not only inform the next generation of climate targets under the Paris Agreement but will also provide the scientific yardstick by which the success or failure of global climate efforts will be measured for years to come.
For those interested in following the progress of the Seventh Assessment Report, further information is available at www.ipcc.ch. The IPCC continues to serve as the world’s primary authority on the most urgent challenge of the 21st century, ensuring that policy is shaped by the best possible science.
For media inquiries, please contact the IPCC Press Office via email at [email protected], or reach out to representatives Andrej Mahecic (+41 22 730 8516) or Werani Zabula (+41 22 730 8120).
Neng Nana
