Working Group I of the United Nations International Panel for Climate Change (IPCC) made public its contribution to the fifth Assessment Report (AR5) on 27 September 2013. WGI focuses on the physical science knowledge as to climate change . Hereafter follow some quotes directly from the report. Those underline the level of seriousness of climate change and the direct link to human activities. Observed changes in the climate system: Atmosphere - " Warming of the climate system is unequivocal , and since the 1950s, many of the observed changes are unprecedented over decades to millennia." - "In the Northern Hemisphere, 1983-2012 was likely the warmest 30-year period of the last 1400 years ( medium confidence )." - "Continental-scale surface temperature reconstructions show, with high confidence , multi-decadal periods during the Medieval Climate Anomaly (year 950-1250) that were in some regions as warm as in the late 20th century. These regional...
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