Not very well, claims a study recently published in Nature. The principle claim is that "laypeople interpret IPCC statements as conveying probabilities closer to 50% than intended by the IPCC authors." In other words, if the IPCC uses a term to convey that a hypothesis is 90% likely, people intepret it to mean that the hypothesis is significantly less than 90% likely. And mutatis mutandis if the hypothesis is highly unlikely: people intepret the phrase to mean something closer to 50% then the authors of the report intend.

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