Interpreting the Probabilistic Language in IPCC Reports

The Intergovernmental Panel on Climate Change (IPCC) often qualifies its statements by use of probabilistic “likelihood” language. In this paper, I show that this language is not properly interpreted in either frequentist or Bayesian terms—simply put, the IPCC uses both kinds of statistics to calcul...

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Main Author: Corey Dethier
Format: Article
Language:English
Published: Michigan Publishing 2023-11-01
Series:Ergo, An Open Access Journal of Philosophy
Online Access:https://journals.publishing.umich.edu/ergo/article/id/4637/
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author Corey Dethier
author_facet Corey Dethier
author_sort Corey Dethier
collection DOAJ
description The Intergovernmental Panel on Climate Change (IPCC) often qualifies its statements by use of probabilistic “likelihood” language. In this paper, I show that this language is not properly interpreted in either frequentist or Bayesian terms—simply put, the IPCC uses both kinds of statistics to calculate these likelihoods. I then offer a deflationist interpretation: the probabilistic language expresses nothing more than how compatible the evidence is with the given hypothesis according to some method that generates normalized scores. I end by drawing some tentative normative conclusions.
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issn 2330-4014
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publishDate 2023-11-01
publisher Michigan Publishing
record_format Article
series Ergo, An Open Access Journal of Philosophy
spelling doaj-art-aaa826c55d4f463c8edd8e1222b8bc9b2025-08-20T02:13:24ZengMichigan PublishingErgo, An Open Access Journal of Philosophy2330-40142023-11-0110010.3998/ergo.4637Interpreting the Probabilistic Language in IPCC ReportsCorey Dethier0Leibniz Universität HannoverThe Intergovernmental Panel on Climate Change (IPCC) often qualifies its statements by use of probabilistic “likelihood” language. In this paper, I show that this language is not properly interpreted in either frequentist or Bayesian terms—simply put, the IPCC uses both kinds of statistics to calculate these likelihoods. I then offer a deflationist interpretation: the probabilistic language expresses nothing more than how compatible the evidence is with the given hypothesis according to some method that generates normalized scores. I end by drawing some tentative normative conclusions.https://journals.publishing.umich.edu/ergo/article/id/4637/
spellingShingle Corey Dethier
Interpreting the Probabilistic Language in IPCC Reports
Ergo, An Open Access Journal of Philosophy
title Interpreting the Probabilistic Language in IPCC Reports
title_full Interpreting the Probabilistic Language in IPCC Reports
title_fullStr Interpreting the Probabilistic Language in IPCC Reports
title_full_unstemmed Interpreting the Probabilistic Language in IPCC Reports
title_short Interpreting the Probabilistic Language in IPCC Reports
title_sort interpreting the probabilistic language in ipcc reports
url https://journals.publishing.umich.edu/ergo/article/id/4637/
work_keys_str_mv AT coreydethier interpretingtheprobabilisticlanguageinipccreports