The Second Assessment Report (SAR) of the United Nations Intergovernmental Panel on Climate Change (IPCC).

The contribution from Working Group I focuses on the science of climate change. It covers the physical climate system, the factors that drive climate change, analyses of past climate and projections of future climate change, and detection and attribution of human influence on recent climate.
The contribution from Working Group II focuses on potential impacts of climate change, adaptive responses, and measures that could mitigate future emissions. It covers a wide range of ecological systems and socioeconomic sectors and activities.
The contribution from Working Group III focuses on the socioeconomic aspects of climate change. It covers the scope of the analysis, decision making under uncertainty, equity issues, intertemporal equity and discounting, applicability of cost and benefit assessments to climate change, social costs of climate change, response options, conceptual issues related to estimating mitigation costs, review of mitigation cost studies, integrated assessment of climate change, and an economic assessment of policy options to address climate change.