Public perception (55%) comes from a survey conducted by John Cook on a representative USA sample, asking the question "How many climate experts agree that the global warming we are witnessing is a direct consequence of the burning of fossil fuels by humans?" Participants were requested through professional survey firm Qualtrics.
Statistic of 97% climate scientists agreeing on human-caused global warming comes from Doran & Zimmermann (2009), Anderegg et al. (2010) and Cook et al. (2013).
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