Thread: Schlesinger: Maximum 20% of IPCC Have Ever Had Any Dealings With Climate

There are three parts to the IPCC report.

Working Group I Report "The Physical Science Basis"
Working Group II Report "Impacts, Adaptation and Vulnerability
Working Group III Report "Mitigation of Climate Change"

Only the first contains a large number of climate scientists as authors. In fact you can get a good idea what experts are involved in the IPCC by looking at the chapter names:

WG1:
Chapter 1: Historical Overview of Climate Change Science
Chapter 2: Changes in Atmospheric Constituents and in Radiative Forcing
Chapter 3: Observations: Surface and Atmospheric Climate Change
Chapter 4: Observations: Changes in Snow, Ice and Frozen Ground
Chapter 5: Observations: Oceanic Climate Change and Sea Level
Chapter 6: Palaeoclimate
Chapter 7: Couplings Between Changes in the Climate System and Biogeochemistry
Chapter 8: Climate Models and their Evaluation
Chapter 9: Understanding and Attributing Climate Change
Chapter 10: Global Climate Projections
Chapter 11: Regional Climate Projections



WG2:
Chapter 1: Assessment of Observed Changes and Responses in Natural and Managed Systems
Chapter 2: New Assesment Methods and the Characterisation of Future Conditions
Chapter 3: Fresh Water Resources and their Management
Chapter 4: Ecosystems, their Properties, Goods and Services
Chapter 5: Food, Fibre, and Forest Products
Chapter 6: Coastal Systems and Low-Lying Areas
Chapter 7: Industry, Settlement and Society
Chapter 8: Human Health
Chapter 9: Africa
Chapter 10: Asia
Chapter 11: Australia and New Zealand
Chapter 12: Europe
Chapter 13: Latin America
Chapter 14: North America
Chapter 15: Polar Regions (Arctic and Antarctic)
Chapter 16: Small Islands
Chapter 17: Assessment of Adaptation Practices, Options, Constraints and Capacity
Chapter 18: Inter-Relationships Between Adaptation and Mitigation
Chapter 19: Assessing Key Vulnerabilities and the Risk from Climate Change
Chapter 20: Perspectives on Climate Change and Sustainability

WG3:
Chapter 1: Introduction
Chapter 2: Framing Issues
Chapter 3: Issues related to mitigation in the long-term context
Chapter 4: Energy Supply
Chapter 5: Transport and its infrastructure
Chapter 6: Residential and commercial buildings
Chapter 7: Industry
Chapter 8: Agriculture
Chapter 9: Forestry
Chapter 10: Waste management
Chapter 11: Mitigation from a cross-sectoral perspective
Chapter 12: Sustainable Development and mitigation
Chapter 13: Policies, instruments, and co-operative arrangements

A contributor to "Waste management" for example is unlikely to be a climate scientist.