via libertarianinstitute:
One of the popular rhetorical moves in the climate change debate is for advocates of aggressive government intervention to claim that “97% of scientists” agree with their position, and so therefore any critics must be unscientific “deniers.”
Now these claims have been dubious from the start; people like David Friedman have demonstrated that the “97% consensus” assertion became a talking point only through a biased procedure that mischaracterized how journal articles were rated, and thereby inflating the estimate.
But beyond that, a review in The New Republic of a book critical of mainstream economics uses the exact same degree of consensus in order to cast aspersions on the science of economics. In other words, when it comes to the nearly unanimous rejection of rent control or tariffs among professional economists, at least some progressive leftists conclude that there must be group-think involved. The one consistent thread in both cases—that of the climate scientists and that of the economists—is that The New Republic takes the side that will expand the scope of government power, a central tenet since its birth by Herbert Croly a century ago.
The Dubious “97% Consensus” Claim Regarding Climate Science
Back in 2014, David Friedman worked through the original paper that kicked off the “97% consensus” talking point. What the original authors, Cook et al., actually found in their 2013 paper was that 97.1% of the relevant articles agreed that humans contribute to global warming. But notice that that is not at all the same thing as saying that humans are the main contributors to observed global warming (since the Industrial Revolution).
This is a huge distinction. For example, I co-authored a Cato study with climate scientists Pat Michaels and Chip Knappenberger, in which we strongly opposed a U.S. carbon tax. Yet both Michaels and Knappenberger would be climate scientists who were part of the “97% consensus” according to Cook et al. That is, Michaels and Knappenberger both agree that, other things equal, human activity that emits carbon dioxide will make the world warmer than it otherwise would be. That observation by itself does not mean there is a crisis nor does it justify a large carbon tax.
Incidentally, when it comes down to what Cook et al. actually found, economist David R. Henderson noticed that it was even less impressive than what Friedman had reported. Here’s Henderson:
[Cook et al.] got their 97 percent by considering only those abstracts that expressed a position on anthropogenic global warming (AGW). I find it interesting that 2/3 of the abstracts did not take a position. So, taking into account David Friedman’s criticism above, and mine, Cook and Bedford, in summarizing their findings, should have said, “Of the approximately one-third of climate scientists writing on global warming who stated a position on the role of humans, 97% thought humans contribute somewhat to global warming.” That doesn’t quite have the same ring, does it? [David R. Henderson, bold added.]
So to sum up: The casual statements in the corporate media and in online arguments would lead the average person to believe that 97% of scientists who have published on climate change think that humans are the main drivers of global warming. And yet, at least if we review the original Cook et al. (2013) paper that kicked off the talking point, what they actually found was that of the sampled papers on climate change, only one-third of them expressed a view about its causes, and then of that subset, 97% agreed that humans were at least one cause of climate change. This would be truth-in-advertising, something foreign in the political discussion to which all AGW issues now seem to descend.
The New Republic’s Differing Attitudes Towards Consensus
The journal The New Republic was founded in 1914. Its website states: “For over 100 years, we have championed progressive ideas and challenged popular opinion….The New Republic promotes novel solutions for today’s most critical issues.”
With that context, it’s not surprising that The New Republic uses the alleged 97% consensus in climate science the way other progressive outlets typically do. Here’s an excerpt from a 2015 article (by Rebecca Leber) in which Republicans were excoriated for their anti-science stance on climate change:
Two years ago, a group of international researchers led by University of Queensland’s John Cook surveyed 12,000 abstracts of peer-reviewed papers on climate change since the 1990s. Out of the 4,000 papers that took a position one way or another on the causes of global warming, 97 percent of them were in agreement: Humans are the primary cause. By putting a number on the scientific consensus, the study provided everyone from President Barack Obama to comedian John Oliver with a tidy talking point. [Leber, bold added.]
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