04/20/2017

Politics Disguised As Science: When To Doubt A Scientific ‘Consensus’

Jay Richards, The Stream

This week’s March for Science is odd. Marches are usually held to defend something that’s in peril. Does anyone really think big science is in danger? The mere fact that the March was scheduled for Earth Day betrays what the event is really about: politics. The organizers admitted as much early on, though they’re now busy trying to cover the event in sciencey camouflage.

If past is prologue, expect to hear a lot about the supposed “consensus” on catastrophic climate change this week. The purpose of this claim is to shut up skeptical non-scientists.

How should non-scientists respond when told about this consensus? We can’t all study climate science. But since politics often masquerades as science, we need a way to tell one from the other.

“Consensus,” according to Merriam-Webster, means both “general agreement” and “group solidarity in sentiment and belief.” That sums up the problem. Is this consensus based on solid evidence and sound logic, or social pressure and groupthink?

Anyone who has studied the history of science knows that scientists are prone to herd instincts. Many false ideas once enjoyed consensus. Indeed, the “power of the paradigm” often blinds scientists to alternatives to their view. Question the paradigm, and some respond with anger.

We shouldn’t, of course, forget the other side of the coin. There are cranks and conspiracy theorists. No matter how well founded a scientific consensus, there’s someone who thinks it’s all hokum. Sometimes these folks turn out to be right. But often, they’re just cranks whose counsel is best ignored.

So how do we distinguish, as Andrew Coyne puts it, “between genuine authority and mere received wisdom? And how do we tell crankish imperviousness to evidence from legitimate skepticism?” Do we have to trust whatever we’re told is based on a scientific consensus unless we can study the science ourselves? When can you doubt a consensus? When should you doubt it?

Your best bet is to look at the process that produced, defends and transmits the supposed consensus. I don’t know of any complete list of signs of suspicion. But here’s a checklist to decide when you can, even should, doubt a scientific “consensus,” whatever the subject. One of these signs may be enough to give pause. If they start to pile up, then it’s wise to be leery.

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