Orange dashed arrow and horizontal orange error bar show respectively the central estimate and likely range of the time at which 1.5☌ is reached if the current rate of warming continues. Panel a: Observed monthly global mean surface temperature (GMST, grey line up to 2017, from the HadCRUT4, GISTEMP, Cowtan–Way, and NOAA datasets) change and estimated anthropogenic global warming (solid orange line up to 2017, with orange shading indicating assessed likely range). Global warming is likely to reach 1.5☌ between 20 if it continues to increase at the current rate. Human activities are estimated to have caused approximately 1.0☌ of global warming 5 above pre-industrial levels, with a likely range of 0.8☌ to 1.2☌. *Box SPM.1 Core Concepts Central to this reportĪ.1. In the SPM, knowledge gaps are identified associated with the underlying chapters of the Report.Ĭhanges to the Underlying Scientific-Technical Assessment to ensure consistency with the approved Summary for Policymakers The level of confidence associated with each key finding is reported using the IPCC calibrated language 3. The underlying scientific basis of each key finding is indicated by references provided to chapter elements. This Summary for Policymakers (SPM) presents the key findings of the Special Report, based on the assessment of the available scientific, technical and socio-economic literature 2 relevant to global warming of 1.5☌ and for the comparison between global warming of 1.5☌ and 2☌ above pre-industrial levels. The IPCC accepted the invitation in April 2016, deciding to prepare this Special Report on the impacts of global warming of 1.5☌ above pre-industrial levels and related global greenhouse gas emission pathways, in the context of strengthening the global response to the threat of climate change, sustainable development, and efforts to eradicate poverty. This Report responds to the invitation for IPCC ‘… to provide a Special Report in 2018 on the impacts of global warming of 1.5☌ above pre-industrial levels and related global greenhouse gas emission pathways’ contained in the Decision of the 21st Conference of Parties of the United Nations Framework Convention on Climate Change to adopt the Paris Agreement 1. Elvira Poloczanska (Germany, United Kingdom).Chukwumerije Okereke (United Kingdom, Nigeria).Tania Guillén Bolaños (Germany, Nicaragua).
Renée van Diemen (United Kingdom, Netherlands).
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