To be included in the database, four criteria had to be met. First, only scenarios published in the peer-reviewed literature could be considered, per IPCC protocol. Second, the scenario must contain a minimum set of required variables and some basic model and scenario documentation meta data must be provided. Third, only models with at least full energy system representation were considered given that specific sectoral studies were assessed in Chapters of the report. Lastly, the scenario must provide data out to at least Scenarios were submitted by entering the data into a standardized data template that was subsequently uploaded to this database system administered by IIASA.

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Part 1 "The scientific basis": The report analyses the enormous body of observations of all parts of the climate system, concluding that this body of observations now gives a collective picture of a warming world. The report catalogues the increasing concentrations of atmospheric greenhouse gases and assesses the effects of these gases and atmospheric aerosols in altering the radiation balance of the Earth-atmosphere system.

The report assesses the understanding of the processes that govern the climate system and by studying how well the new generation of climate models represent these processes, assesses the suitability of the models for projecting climate change into the future. A detailed study is made of human influence on climate and whether it can be identified with any more confidence than in , concluding that there is new and stronger evidence that most of the observed warming observed over the last 50 years is attributable to human activities.

Projections of future climate change are presented using a wide range of scenarios of future emissions of greenhouse gases and aerosols. Both temperature and sea level are projected to continue to rise throughout the 21st century for all scenarios studied. Finally, the report looks at the gaps in information and understanding that remain and how these might be addressed. Part 2 "Impacts, Adaptation and Vulnerability" This report examines climate change impacts, adaptation, and vulnerability across a range of systems and sectors and includes a regional assessment.

Environmental, social, and economic dimensions of these issues are assessed in this report. Efforts are made to address a number of issues that cut across the various sectors and systems covered by the report, as well as across all three parts, such as sustainable development, equity, scientific uncertainties, costing methodologies, and decisionmaking frameworks. Part 3 "Mitigation" The assessment focuses on the policy-relevant questions of today. The report, in accordance with the mandate given to Working Group III, explicitly places climate change mitigation in the broader context of development, equity, and sustainability.

It draws on a broad set of literature also covering the social sciences and acknowledges different views on the linkages between climate change mitigation and sustainable development policies.



Such models cannot yet simulate all aspects of climate e. Nevertheless, confidence in the ability of these models to provide useful projections of future climate has improved due to their demonstrated performance on a range of space and time-scales [3]. There is new and stronger evidence that most of the warming observed over the last 50 years is attributable to human activities Human influences will continue to change atmospheric composition throughout the 21st century Global average temperature and sea level are projected to rise under all IPCC SRES scenarios. The TAR estimate for the climate sensitivity is 1. The wide range in projections is based upon several different scenarios that assume different levels of future CO2 emissions see the section below on Projections in the TAR.


Climate Change 2001 - IPCC Third Assessment Report

Research Institute of Organic Agriculture 1. Swiss Academy of Engineering Sciences 9. Education and Training Opportunities for young scientists and postdocs. Legal and Social sciences, Economics 8. LS2 Life Sciences Switzerland 2. From Wikipedia, the free encyclopedia.





IPCC Third Assessment Report


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