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''Climate Change 2007'', the Fourth Assessment Report (AR4) of the United Nations Intergovernmental Panel on Climate Change (IPCC), is the fourth in a series of reports intended to assess scientific, technical and socio-economic information concerning climate change, its potential effects, and options for adaptation and mitigation. The report is the largest and most detailed summary of the climate change situation ever undertaken, produced by thousands of authors, editors, and reviewers from dozens of countries, citing over 6,000 peer-reviewed scientific studies. It supersedes the Third Assessment Report (2001), and is superseded by the Fifth Assessment Report. The headline findings of the report were: "warming of the climate system is unequivocal", and "most of the observed increase in global average temperatures since the mid-20th century is very likely due to the observed increase in anthropogenic greenhouse gas concentrations." ==Sections== The report was released in four principal sections: * Contribution of Working Group I (WGI): ''Climate Change 2007: The Physical Science Basis''.〔.〕 * Contribution of Working Group II (WGII): ''Climate Change 2007: Impacts, Adaptation and Vulnerability''.〔.〕 * Contribution of Working Group III (WGIII): ''Climate Change 2007: Mitigation of Climate Change''.〔.〕 * Contribution of Working Groups I, II, and III: ''The Synthesis Report'' (SYR).〔.〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「IPCC Fourth Assessment Report」の詳細全文を読む スポンサード リンク
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