The Case Against the Climate Change Consensus


Image by Gerhard G. from Pixabay

Temperatures spiking! Rivers flooding! Sea level rising! How true are these claims? Not so fast, argues Steven Koonin in his new book, UnsettledWhat Climate Science Tells Us, What It Doesn’t, and Why It Matters. (BenBella Books, April, 2021, 320 pages)

The book presents a seemingly devastating critique of current climate science, taking to task the scientific establishment, the media, politicians, and NGOs for propagating an unbalanced, alarmist approach to climate change and global warming. (For a rebuttal of Koonin’s contrarian claims, here’s a hostile review.)

Koonin is one of America’s most distinguished scientists, a member of the National Academy of Sciences, professor at NYU, former Undersecretary for Science in the US Department of Energy under President Obama, chief scientist for renewable energy at British Petroleum, and author of the classic textbook, Computational Physics, about computer modeling of physical processes. Though he leans left politically, he strongly disagrees with the “consensus” about climate change, arguing that the science of climate change is still in flux.

“But the science is not settled. Open debate is at the heart of the scientific process; it is absurd that scientists should fear being labeled anti-science for engaging in it.”

The book critiques the broad consensus about climate science. It’s especially timely as the Biden Administration seeks a $3.5 trillion economic package, some of which is designated to address climate change. Koonin strongly disagrees with the common wisdom about climate change. As he notes at the start of the book, there’s a pervasive (false) public perception about the earth’s climate, which he describes this way:

“Humans have already broken the earth’s climate. Temperatures are rising, sea level is surging, ice is disappearing, and heat waves, storms, droughts, floods, and wildfires are an ever-worsening scourge on the world. Greenhouse gas emissions are causing all of this. And unless they’re eliminated promptly by radical changes to society and energy systems, ‘The Science’ says Earth is doomed.”

Unsettled argues this is an exaggeration. The book maintains that while the earth is warming and humans have contributed to this warming, the effects are much milder than advertised. Koonin observes that the research literature points out that “heat waves in the US are now no more common than they were in 1900, and that the warmest temperatures in the US have not risen in the past 50 years.”

If this is the case, why have we been hearing the opposite, with every day bringing “news” of climate catastrophes? He explains that the media, politicians, scientists, and NGOs have an interest in hyping the data to get public attention and cherry picking the data to support the climate orthodoxy. He’s especially critical of scientists for advocating a particular political position rather than following the facts.

In addition to providing a detailed critique of the climate science “consensus,” the book offers a fascinating and detailed technical explanation of how climate science actually works — its limits, possibilities, and what this science really tells us about the future of our planet. Whether this book will topple the applecart of consensus on climate change is an open question. Here, for example, are Scientific American‘s objections to Koonin’s case.

Nick O'Connell
Nick O'Connell
Nicholas O’Connell, M.F.A, Ph.D., is the author of the novel, The Storms of Denali and several nonfiction books. He contributes to Saveur, Outside, GO, National Geographic Adventure, Condé Nast Traveler, Food & Wine, and many other places. He teaches for


  1. A critical review of Steven Koonin’s ‘Unsettled’
    ‘Tilting at strawmen.’ Or ‘red flag.’ There are no finer shorthand descriptions of a controversial new book on climate science.
    by Mark Boslough May 25, 2021

    I would normally ignore a book by a non-climate scientist promising “the truth about climate science that you aren’t getting elsewhere.” Such language is a red flag. But I’ve known the author of “Unsettled” since I took his quantum mechanics course as a Ph.D. student at Caltech in the 1970s. He’s smart and I like him, so I’m inclined to give his book a chance.

    But smart scientists aren’t always right, and nice guys are still prone to biases – especially if they listen to the wrong people. In an apparent quest for fairness when he led a committee of the American Physical Society (one of my professional organizations) to assess its statement on climate change, he recruited three scientists to represent the 97% consensus, and three contrarians, presumably to speak for the other 3%. The lack of proportionate representation amplified the contrary opinions that he heard, and only in one direction. He completely ignored another, equally unfounded, contrary view. The position sometimes referred to as “doomism” (the belief that the worst-case is inevitable and it is too late to prevent it) was not represented.

    The three contrarians had a long and well-documented history of engaging in ad hominem attacks on mainstream climate scientists and misrepresenting their work. Most of the technical mistakes and misrepresentations in “Unsettled” may simply be attributable to Koonin’s trust of those advisors and lack of rigorous independent verification.
    Some books CAN be told by their cover. This is one of them.

    Unfortunately, “Unsettled” is a book you can accurately judge by its cover. Koonin’s title hints at a logical fallacy called the “strawman” argument. The blurb on the flap confirms this with its opening sentence: “When it comes to climate change, the media, politicians, and other prominent voices have declared that ‘the science is settled.’”

    A bit of fact checking by the author or publisher would have shown that this claim is not true. In fact, Koonin makes use of an old strawman concocted by opponents of climate science in the 1990s to create an illusion of arrogant scientists, biased media, and lying politicians – making them easier to attack.

    The phrase “science is settled” is repeated as Koonin’s target throughout the book, even though it has never been in common use by climate scientists and their supporters. If it were, then Google and LexisNexis searches would surely turn up instances, but the opposite is true. All the examples I found were from critics claiming that advocates of the consensus had said it.
    Bogus ‘science is settled‘ rhetoric dating back 25 years

    The earliest published use I found was a July 11, 1996, letter to the Wall Street Journal from prominent denier Fred Singer, falsely claiming that the IPCC report had been inappropriately tampered with for political purposes and that “politicians and activists” were “anxious to stipulate that the science is settled.”

    Singer’s strawman gained traction a year later when William O’Keefe, the chairman of Global Climate Coalition (a lobbying organization opposed to climate action) claimed in a statement to Congress that “the [Clinton] Administration repeatedly quotes that [IPCC] sentiment out of context in its statements that the ‘science is settled.’” It stands to reason that repeated use of the phrase “science is settled” would be found in searches if true.

    Searches do, however, turn up (in the White House archive) what Clinton actually said only two weeks before Singer’s letter. “The science is clear and compelling: We humans are changing the global climate.” Nobody could argue with that at the time, nor can they now.

    There are many examples of physical problems that are difficult to model, have large uncertainties and unpredictable outcomes, put people at risk, and require policy decisions and international treaties. My primary field of planetary defense is one. It’s a clear and compelling fact that the Earth will be hit by another asteroid. We just don’t know where, when, or how bad it will be.

    The recent re-entry of an errant Chinese upper stage provides a more concrete analogy. The fact that its orbit would decay and it was going to come down was not in question, and could rightly be called “a settled fact.” Various models had huge uncertainties, disagreed with one another, and could not predict the reentry location. But those inadequacies cannot be used as evidence for any absurd claim that it was going to stay in orbit. Anyone taking that position would be guilty of the same logical fallacy (called “impossible expectations”) that Koonin directs toward climate science.
    Unpacking the ‘strawman’ argument

    Another example of a strawman argument in “Unsettled” is the claim that the term “climate change denial” is intended to invoke Holocaust denial, an assertion that triggers strong emotions. Koonin says, “I find it particularly abhorrent to have a call for open scientific discussion equated with Holocaust denial, especially since the Nazis killed more than two hundred of my relatives in Eastern Europe.” I do not doubt the sincerity of his anger, but it is misdirected.

    First, it’s aimed at a strawman. Climate change deniers are (by definition) not asking for open scientific discussion. The term “denier” is reserved for those who simply deny.

    Second, there is no evidence that the term “climate change denial” is intended to invoke Holocaust denial. Ironically, this connection was first made by the late Hollywood screenwriter Michael Crichton, speaking at a 2003 lecture at Caltech, where Koonin was provost. The word “denier” literally means “one that denies” and the term has been used this way since the 1400s. The term Holocaust denier didn’t come into widespread use until the 1980s. By the early 1990s “denier” was independently being used to describe those who deny the science of climate change.

    Third, it is climate scientists, not deniers, who have been compared to Nazis and perpetrators of genocide. In fact it was Crichton himself, in the appendix to his 2004 book “State of Fear,” who directly equated climate scientists to eugenicists who had a role in “killing of ten million undesirables.” Crichton also explicitly compared climate scientists to Trofim Lysenko, whose work he described as resulting in “famines that killed millions and purges that sent hundreds of dissenting Soviet scientists to the gulags or the firing squads.” Nevertheless, Koonin praises Crichton and cites “State of Fear” as evidence that he was an “outspoken advocate for scientific integrity” who “looked askance at the public presentation of climate science.”

    Whether one thinks it is more abhorrent to be described by the same word as those who deny other things, including the Holocaust, or to be explicitly equated to those who carried out the Holocaust is a matter of personal opinion but may indicate unconscious bias.
    More uncertainty amounts to more risk

    Koonin’s bias became evident in the introduction by his use of biased language. Climate scientists “adjust model results to obfuscate shortcomings.” “Climate alarmism has come to dominate US politics.” By speaking openly about uncertainty, he had “inadvertently broken some code of silence, like the Mafia’s omerta.”

    Koonin implies throughout the book that climate scientists have conspired to downplay uncertainty and exaggerate the risk, apparently unaware of the fact that increased uncertainty means increased risks. Nowhere does he mention that climate sensitivity is described in the scientific literature by a probability density function that is highly skewed, with a long high-sensitivity tail that we cannot discount with certainty. Risk is the integrated product of probability and consequences. It’s hard to argue that the consequences of climate change don’t get worse with sensitivity.

    If a pilot isn’t sure about having enough fuel to get you to your destination, if an astronomer isn’t sure that an incoming asteroid will miss the Earth, if your doctor isn’t sure if you have a terminal disease, if you’re not sure you turned the stove off: In each of these cases, the uncertainty is unsettling. Why does Koonin think that unsettled questions in climate science are any kind of comfort when the consequences of doing nothing can be catastrophic? “Unsettled” should leave serious scientists feeling unsettled.

    Readers would do well to see for information about logical fallacies used by climate change deniers.

    Mark Boslough is a Fellow of the Committee for Skeptical Inquiry. He has served on the Executive Committee of the American Physical Society Topical Group on the Physics of Climate and created, convened, and for several years chaired American Geophysical Union sessions on “Uncertainty Quantification and its Application to Climate Change.”

  2. This is a helpful reminder that it is important to take actions even when the scientific consensus may not be as strong, or that it shifts. After all, science is a method of inquiry that can shift as new information is taken in from ongoing research etc.
    The cautionary tail is that with Climate Change, the time to act is not rung by science. It is done by society making its best assessment at the time. Lots of examples of this are in our backyard….The science was not perfectly clear for the dangers from the air pollution from the Asarco Smelter. Industry proposed other measures and had their “science” to back it up. Same with smoking tobacco and just about every other major pollution elimination effort our country has faced. Good thing we acted anyway! The smelter plume dropped poisons in the soils for gardens and yards in the plume area. Vegetable grown in the gardens took up those poisons and became part of the fresh vegetables from those home gardens. Lawyers and scientists argued about the dangers of that too. Fortunately we as a state acted to clean up those soils.

    Global warming has attracted more of a consensus because we have needed it to upend the lies from industry. Plus it is caused by actions across the globe and induces long term changes in our climate, oceans, and the air we breath. So lots of scientists from different strands of the scientific inquiry have been involved.


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