The Evolution of Communicating the Uncertainty of Climate Change to Policymakers: A Study of IPCC Synthesis Reports

The Intergovernmental Panel on Climate Change (IPCC) reports climate change have served to alert both the public and policymakers about scope of predicted changes effects they would natural economic systems. first IPCC report was published in 1990, since which time a further four been produced. aim this study conduct content analysis Summaries for Policymakers order determine degree certainty associated with statements contain. For each we analyzed all containing expressions indicating corresponding level confidence. aggregated results show shift over towards higher levels, implying “Call action” (from 32.8% IPCC2 70.2% IPCC5). With regard international agreements drawn up tackle change, growing confidence expressed might relevant factor history decision making.