evidence: The first quantification of the consensus among climate experts was published in 2009, by Peter Doran and Maggie Zimmerman. Surveying the Earth science community, they found 80% agreement that humans were causing global warming. However, the degree of consensus was higher among scientists with greater climate science expertise. Among actively-publishing climate scientists, 97.4% agreed that humans were causing global warming. [...] That response took me aback, as we weren’t the first research to find 97% consensus on human-caused global warming. We weren’t even the second (William Anderegg also found 97% consensus in 2010). But the public weren’t yet getting the message.