What exactly do the 98% of climate researchers believe?

Our political culture has moved so far to the Right that the term ‘sceptic’ now has a negative connotation and argument by ‘appeal to authority’ wins the day, even when dodgy.

De omnibus dubitandum – Question everything!

“If 98% of doctors said you needed urgent surgery, wouldn’t you have it?!” “If 98% of aeronautical engineers told you that your next flight is unsafe and likely to crash, would you listen to them or to the 2% who say otherwise?” John Kerry, US Secretary of State, claimed in May this year that the consequences of climate change could be “crippling” and that “97% of the world’s scientists tell us this is urgent”. Last year, a tweet in President Barack Obama’s name asserted that “Ninety-seven percent of scientists agree: climate change is real, man-made and dangerous.” Note: “dangerous”. Obama cited a study of climate science consensus led by University of Queensland academic, John Cook. (About which, more later).

I have heard these analogies and claims repeated in various forms by politicians and ‘climate activists’ through the media for a few years now. They certainly have a great run in the mainstream but they rarely cite a source for the 97%-98% figure. So, I decided to do a bit of investigating for myself.

Surveys of what the climate experts’ think take two methodological approaches: reviews of peer-reviewed literature and polls. Doran, Kendall and Zimmerman polled 10,257 Earth scientists in 2009 while Anderegg, Prall, Harold and Schneider reviewed 1,372 abstracts and citation data in the climate change/global warming field in 2010. Last year, John Cook et al examined nearly 12,000 abstracts from the peer-reviewed scientific literature.

Doran et al (2009)

Doran is interesting because it used a polling methodology and a seemingly big sample of more than 10,000 Earth scientists. However, on closer inspection, they point out that only 3,146 of the scientists responded. Still, that’s not a bad figure. But the 98% figure is derived not from those 3,000-plus but from those deemed to have special expertise in climate change, that is, those who had published at least 50% of their peer-reviewed papers in that area. The actual numerical basis for the 98% figure on this occasion is from 77 out of 79 in the study. Seventy-nine agreed with the proposition that global mean temperature has risen since the late nineteenth century and 77 agreed that human activity is a significant factor. The Doran study is called ‘Examining the scientific consensus on climate change’ published in the American Geophysical Union journal. Doran et al (2009) So, when John Kerry refers to “the world’s scientists”, one can only hope he has some other evidence in mind.

Anderegg et al (2010)

The Anderegg survey in 2010 was published in the Proceedings of the US National Academy of Sciences. Anderegg et al reviewed abstracts and citation data of 1,372 climate researchers (they use the term ‘researchers’, though presumably most are scientists) and drew conclusions from 908 of them. Leaving aside that publication does not necessarily equate to expertise, Anderegg et al measured the climate researchers’ positions regarding the same two basic questions: Has the planet warmed and has human activity been a significant factor? They found that 97% to 98% of the 908 Abstracts and citations agreed with both propositions. The Anderegg report is called ‘Expert credibility in climate change’. Anderegg et al (2010) 

Cook et al (2013)

The 2013 work by Cook et al received international attention. It reviewed 11,944 abstracts from peer-reviewed climate-related scientific literature and the authors concluded that 97% of those who took a position supported the consensus that warming has happened and that human activity is responsible for at least half the warming since 1950. However, 66% of the abstracts reached no conclusion or took no position on the topic and so were not included. Thus, the figure of 97% refers to 97% of those with a position: approx. 4,000 out of about 12,000 abstracts. Leaving aside for a moment the question as to how the 8,000 with ‘no opinion’ might have been better dealt with, the Cook et al review found essentially what Anderegg and Doran had found: 97% consensus. Cook et al’s study is called ‘Quantifying the consensus on anthropological global warming in the scientific literature’ in Environmental Research Letters Cook et al (2013).

Questioning and scepticism

In each case, the objective was to find out what climate experts felt about the question of whether the planet has warmed and whether human activity plays a significant part. None of the studies – and none that I know of – have sought to ascertain what the climate experts think about the likelihood of “crippling consequences”, to quote John Kerry, or the likelihood of crisis or catastrophe. Nor do the studies seek to ascertain expert opinion on whether warming may be good or bad on balance.

So, how do the words of John Kerry and other alarmists measure up against these studies of expert opinion? Do 97% to 98% of experts believe the situation is “urgent” and will have “crippling consequences”? The answer is no. There is no evidence for such a consensual view.

Politicians, climate activists and influential Hollywood celebrities are misusing the 98% figure derived from such studies to justify an alarmist point of view and to marginalise dissident scientific voices. This is especially unfair given that many or most scientist-sceptics could be part of the 98% in the terms of the studies above. Sceptics generally accept that warming has occurred over the past 130 years. Sceptics tend to be more questioning of the degree to which human activity is a contributing factor and, from my reading of them, generally place emphasis on natural variation rather than industrial activity and CO2 emissions. I do not have the necessary expertise to reach a conclusion on the science but I do know, from history, that minority voices within science are sometimes proven right.

Argument and debate are essential to the advancement of knowledge

A culture of debate is as essential to scientific progress as it is to democracy. Yet our political culture has moved so far to the Right that the term ‘sceptic’ now has a negative connotation and argument by ‘appeal to authority’ wins the day, even when dodgy. And if you stand up for those scientists and experts who are sceptics, as I do, for their right to argue a case without being vilified, then look out for that big “98%” stick! Argument and debate are essential to advancement of knowledge

The findings of Cook et al, referred to above, the one which received international publicity last year, were subjected to critical scrutiny by David Legatesformer Director of the Center for Climatic Research at Delaware University. The challenge by Legates et al drew attention to an obvious problem with the way in which the 97% figure was arrived at. Cook et al adopted seven levels of ratings to categorize their findings.

Category 1 is for research that “Explicitly states that humans are the primary cause of global warming”. Clear enough.

Category 2 is for “Explicit endorsement without quantification” (i.e., does not express a view as to how significant human activity is).

Category 3 is “Implicit endorsement”.

The final four categories are: “No opinion or uncertain”, “Implicit rejection”, “Explicit rejection without quantification”, “Explicit rejection with quantification”.

Using Cook’s own figures, only 64 papers fitted Category 1. That’s 64 out of 11,944 – or, out of 4,000, if we are to agree with Cook that those expressing ‘no opinion’ should not be included in the count. That means, only 1.6% of abstracts explicitly expressed the view that humans are the cause of global warming. A far cry from 97%. Cook et al arrived at the 97% figure by lumping categories 1 to 3 together, when only category 1 explicitly represented the view that human activity was the main cause of warming.

Cook and colleague Bedford claimed in a more recent paper titled ‘Agnotology, scientific consensus and the teaching and learning of climate change’ (2013) that “Of the 4,014 abstracts that expressed a position on the issue of human-induced climate change, Cook et al. (2013) found that over 97% endorsed the view that the Earth is warming up and human emissions of greenhouse gases are the main cause”. The “main cause”? How could John Cook say that, when his own data shows something very different?

An article by John Cook in ‘The Conversation’ is titled “It’s true: 97% of research papers say climate change is happening”. Well, big deal. The fact of climate change is hardly controversial and very few sceptics challenge it. The increase over 130 years is less than a degree and the past 16 years show a pause, so it is hard to argue that the warming is accelerating.

Advice to Obama and John Kerry

Were Obama and Kerry and others to refer to the 98% in their public speeches in a more accurate and honest way, they would have to say something like:

“About 98% of experts accept that the planet has warmed by less than a degree over the past 130 years and that human industrial activity has played a significant part in this. However, there is no consensus as to the main cause”.

Somehow it just doesn’t have the same pull as “dangerous”, or the supposed need for ‘urgent personal surgery’, ‘airplanes crashing’ or “crippling consequences”.

_ _ _ _

In my next post on this topic, I’d like to offer for discussion some ideas on what a left-wing response to all this should be. Alarmism needs to be repudiated but what should be advocated and demanded? 

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8 thoughts on “What exactly do the 98% of climate researchers believe?

  1. ‘However, there is no consensus as to the main cause”.

    Or they could be completely candid and say …

    “There was some fear that the air conditioning might be on the blink, due to something we were doing to the system, but on closer inspection its more likely the influence of our star on earthly oscillations. Which leads me to the conviction that carbon dioxide is innocent of the charges laid against it.”

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  2. This is an interesting blog and I hope that you really wish to have a dialog. I even like this particular blog post in many ways. You ask a great and important question regarding consensus science. And you deconstruct the bizarre Lewandowsky influenced faux papers of Cook & ganag rather well. But I find your framing of it as symptomatic of ‘right wing’ thinking to be a conversation stopper. Mob rule (which consensus science is) is not a right or left thing. Your assertion that the labeling of skeptics as ‘deniers’ a symptom of a right wing worldwide movement seems to lack any evidence. Kerry, who is an ubber rich lefty in US politics/ Using him as an example of what you are calling right wing alarmism, looks rather contrived and bizarre. The climate obsessed do not appear to be very ‘right wing’ at all, frankly. This is sort of like the old oxymoron of ‘scientific socialism’ which turns out to be neither. Frankly I think a better metaphor for this climate obsessed age is found in literature. Specifically Harlan Ellison’s stories where he discusses how new gods behave when fresh on the scene.
    I think the old paradigms of left and right, familiar battle lines- even comfortable in their own way, are not actually relevant in the emergence of the green movement in its elitist self loathing, misanthropy, magical thinking and parasitic organizations.

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  3. ‘I find your framing of it as symptomatic of ‘right wing’ thinking to be a conversation stopper.’

    Yep, this lot is mired in profound ignorance on the subject of climate change and it may take a little while to bring them up to speed.

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  4. Returning to my first comment (the Easterbrook link) he only covers the Holocene, so I’ll take you back a little further to the Younger Dryas.

    There are two schools of thought on what caused this sudden drop in temperature, a big ice melt in north America choked off the Atlantic conveyor belt or a large comet broke up over Europe, Africa and North America.

    My bias is for the latter because the freeze happened in a few short years and not decades as you might expect from oceanic influences. This severe cold snap was mainly felt in the Northern Hemisphere and lasted only 1400 years, which offers further evidence for a comet strike.

    The first humans in the Americas were completely wiped out by this bolt from the blue, which put a damper on the Holocene interglacial, with enormous implications for the emergence of humanity.

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  5. This from Nick Cater in the Oz

    ‘In 1997 Christopher Pearson, sceptic extraordinaire, wrote a column pondering what would happen when the news finally filtered through that greenhouse forecasts had been vastly exaggerated.

    “Perhaps, having safely neg­otiated the millennium, which is a major cause of all this anxiety, we may collectively surrender to a bout of unqualified optimism,” Pearson wrote. “I doubt it.”

    ‘There would be fresh catastrophes on offer, Pearson predicted, since “the appetite for catastrophe is now highly developed and mass media delight in pandering to it”.

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  6. Do you believe ‘that 97% of climate scientists support the claim that global warming is driven directly by man-made CO2. It is true that 97% believe in climate change, which is the question they were asked, which is like asking them if the sun rises in the morning. Far fewer agreed with the man-made warming question and few of them agree on the details.’

    Mark Heyer

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