Abstract
On Friday September 27th, 2013, the World Meteorological Organization (WMO) and the United Nations Environment Programme (UNEP) launched the first part of the Fifth Assessment Report (AR5) of the United Nations Intergovernmental Panel on Climate Change (IPCC). The document on ‘‘The physical science basis’’ of climate changes (CC) is the first one in a series of four, which will constitute AR5. To be published in 2014 are two reports dealing with impacts, adaptation, mitigation, vulnerability plus a synthesis report. As before, the publication presents the scientific consensus (258 experts are involved in the ‘‘Scientific basis’’ report; AR5 involves 831 specialists worldwide) allowing the assessment of 9,200 scientific and technical publications on climate change. The results of the current assessment confirm, update and specify the work of the four previous status evaluations. Main headlines of these results entail:
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