Partial Response to the London Channel 4 Film "The Great Global Warming Swindle" Carl Wunsch 11 March 2007 I believe that climate change is real, a major threat, and almost surely has a major human-induced component. But I have tried to stay out of the `climate wars' because all nuance tends to be lost, and the distinction between what we know firmly, as scientists, and what we suspect is happening, is so difficult to maintain in the presence of rhetorical excess. In the long run, our credibility as scientists rests on being very careful of, and protective of, our authority and expertise. The science of climate change remains incomplete. Some elements are so firmly based on well-understood principles, or for which the observational record is so clear, that most scientists would agree that they are almost surely true (adding CO2 to the atmosphere is dangerous; sea level will continue to rise,...). Other elements remain more uncertain, but we as scientists in our roles as informed citizens believe society should be deeply concerned about their possibility: failure of US midwestern precipitation in 100 years in a mega-drought; melting of a large part of the Greenland ice sheet, among many other examples. I am on record in a number of places complaining about the over-dramatization and unwarranted extrapolation of scientific facts. Thus the notion that the Gulf Stream would or could "shut off" or that with global warming Britain would go into a "new ice age" are either scientifically impossible or so unlikely as to threaten our credibility as a scientific discipline if we proclaim their reality. They also are huge distractions from more immediate and realistic threats. I've paid more attention to the extreme claims in the literature warning of coming catastrophe, both because I regard the scientists there as more serious, and because I am very sympathetic to the goals of my colleagues who sometimes seem, however, to be confusing their specific scientific knowledge with their worries about the future. When approached by WAGTV, on behalf of Channel 4, known to me as one of the main UK independent broadcasters, I was led to believe that I would be given an opportunity to explain why I, like some others, find the statements at both extremes of the global change debate distasteful. I am, after all a teacher, and this seemed like a good opportunity to explain why, for example, I thought more attention should be paid to sea level rise, which is ongoing and unstoppable and carries a real threat of acceleration, than to the unsupportable claims that the ocean circulation was undergoing shutdown (Nature, December 2005). I wanted to explain why observing the ocean was so difficult, and why it is so tricky to predict with any degree of confidence such important climate elements as its heat and carbon storage and transports in 10 or 100 years. I am distrustful of prediction scenarios for details of the ocean circulation that rely on extremely complicated coupled models that run out for decades to thousands of years. The science is not sufficiently mature to say which of the many complex elements of such forecasts are skillful. Nonetheless, and contrary to the impression given in the film, I firmly believe there is a great deal to be learned from models. With effort, all of this is explicable in terms the public can understand. In the part of the "Swindle" film where I am describing the fact that the ocean tends to expel carbon dioxide where it is warm, and to absorb it where it is cold, my intent was to explain that warming the ocean could be dangerous---because it is such a gigantic reservoir of carbon. By its placement in the film, it appears that I am saying that since carbon dioxide exists in the ocean in such large quantities, human influence must not be very important --- diametrically opposite to the point I was making--- which is that global warming is both real and threatening in many different ways, some unexpected. Many of us feel an obligation to talk to the media---it's part of our role as scientists, citizens, and educators. The subjects are complicated, and it is easy to be misquoted or quoted out context. My experience in the past is that these things do happen, but usually inadvertently---most reporters really do want to get it right. Channel 4 now says they were making a film in a series of "polemics". There is nothing in the communication we had (much of it on the telephone or with the film crew on the day they were in Boston) that suggested they were making a film that was one-sided, anti-educational, and misleading. I took them at face value---clearly a great error. I knew I had no control over the actual content, but it never occurred to me that I was dealing with people who already had a reputation for distortion and exaggeration. The letter I sent them as soon as I heard about the actual program is below. As a society, we need to take out insurance against catastrophe in the same way we take out homeowner's protection against fire. I buy fire insurance, but I also take the precaution of having the wiring in the house checked, keeping the heating system up to date, etc., all the while hoping that I won't need the insurance. Will any of these precautions work? Unexpected things still happen (lightning strike? plumber's torch igniting the woodwork?). How large a fire insurance premium is it worth paying? How much is it worth paying for rewiring the house? $10,000 but perhaps not $100,000? There are no simple answers even at this mundane level. How much is it worth to society to restrain CO2 emissions--- will that guarantee protection against global warming? Is it sensible to subsidize insurance for people who wish to build in regions strongly susceptible to coastal flooding? These and others are truly complicated questions where often the science is not mature enough give definitive answers, much as we would like to be able to provide them. Scientifically, we can recognize the reality of the threat, and much of what society needs to insure against. Statements of concern do not need to imply that we have all the answers. Channel 4 had an opportunity to elucidate some of this. The outcome is sad. %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% Mr. Steven Green Head of Production Wag TV 2D Leroy House 436 Essex Road London N1 3QP 10 March 2007 Dear Mr. Green: I am writing to record what I told you on the telephone yesterday about your Channel 4 film "The Global Warming Swindle." Fundamentally, I am the one who was swindled---please read the email below that was sent to me (and re-sent by you). Based upon this email and subsequent telephone conversations, and discussions with the Director, Martin Durkin, I thought I was being asked to appear in a film that would discuss in a balanced way the complicated elements of understanding of climate change--- in the best traditions of British television. Is there any indication in the email evident to an outsider that the product would be so tendentious, so unbalanced? I was approached, as explained to me on the telephone, because I was known to have been unhappy with some of the more excitable climate-change stories in the British media, most conspicuously the notion that the Gulf Stream could disappear, among others. When a journalist approaches me suggesting a "critical approach" to a technical subject, as the email states, my inference is that we are to discuss which elements are contentious, why they are contentious, and what the arguments are on all sides. To a scientist, "critical" does not mean a hatchet job---it means a thorough-going examination of the science. The scientific subjects described in the email, and in the previous and subsequent telephone conversations, are complicated, worthy of exploration, debate, and an educational effort with the public. Hence my willingness to participate. Had the words "polemic", or "swindle" appeared in these preliminary discussions, I would have instantly declined to be involved. I spent hours in the interview describing many of the problems of understanding the ocean in climate change, and the ways in which some of the more dramatic elements get exaggerated in the media relative to more realistic, potentially truly catastrophic issues, such as the implications of the oncoming sea level rise. As I made clear, both in the preliminary discussions, and in the interview itself, I believe that global warming is a very serious threat that needs equally serious discussion and no one seeing this film could possibly deduce that. What we now have is an out-and-out propaganda piece, in which there is not even a gesture toward balance or explanation of why many of the extended inferences drawn in the film are not widely accepted by the scientific community. There are so many examples, it's hard to know where to begin, so I will cite only one: a speaker asserts, as is true, that carbon dioxide is only a small fraction of the atmospheric mass. The viewer is left to infer that means it couldn't really matter. But even a beginning meteorology student could tell you that the relative masses of gases are irrelevant to their effects on radiative balance. A director not intending to produce pure propaganda would have tried to eliminate that piece of disinformation. An example where my own discussion was grossly distorted by context: I am shown explaining that a warming ocean could expel more carbon dioxide than it absorbs -- thus exacerbating the greenhouse gas buildup in the atmosphere and hence worrisome. It was used in the film, through its context, to imply that CO2 is all natural, coming from the ocean, and that therefore the human element is irrelevant. This use of my remarks, which are literally what I said, comes close to fraud. I have some experience in dealing with TV and print reporters and do understand something of the ways in which one can be misquoted, quoted out of context, or otherwise misinterpreted. Some of that is inevitable in the press of time or space or in discussions of complicated issues. Never before, however, have I had an experience like this one. My appearance in the "Global Warming Swindle" is deeply embarrasing, and my professional reputation has been damaged. I was duped---an uncomfortable position in which to be. At a minimum, I ask that the film should never be seen again publicly with my participation included. Channel 4 surely owes an apology to its viewers, and perhaps WAGTV owes something to Channel 4. I will be taking advice as to whether I should proceed to make some more formal protest. Sincerely, Carl Wunsch Cecil and Ida Green Professor of Physical Oceanography Massachusetts Institute of Technology cc: Hamish Mykura, Channel 4 (Hard copy to follow) %%%%%%%%%%%%%%%%%%%%%%5 From: jo locke=20 Sent: 19 September 2006 16:22 To: Carl Wunsch Cc: Eliya Arman Subject: Climate Change Documentary =20 Dear Professor Wunsch, =20 Many thanks for taking the time to talk to me this morning. I found it really useful and now have the issues much clearer in my mind. =20 I wanted to email you to outline the approach we will be taking with our film to clarify our position. We are making a feature length documentary about global warming for Channel Four in the UK. The aim of the film is to examine critically the notion that recent global warming is primarily caused by industrial emissions of CO2. It explores the scientific evidence which jars with this hypothesis and explores alternative theories such as solar induced climate change. Given the seemingly inconclusive nature of the evidence, it examines the background to the apparent consensus on this issue, and highlights the dangers involved, especially to developing nations, of policies aimed at limiting industrial growth. =20 We would like to do an interview with you to discuss the notion that there is a scientific consensus on the effects of global warming on the Great Ocean Conveyor Belt, the Gulf Stream and the North Atlantic Drift. It has been widely reported that Britain and Western Europe could soon be plunged into a mini ice age, and we would like to show that it is simply not true that they will shut down. We would like to talk to you about the numerical models and whether they give us a realistic perspective of the impact of climate change on the oceans. We would also like to talk to you about the 'memory' of oceans, and how it can take varying amounts of time for a disturbance to be readable in the North Atlantic. Fundamentally, we would like to ask you whether scientists have enough information about the complex nature of our climate system. Do the records go back far enough to identify climate trends, and can we conclusively separate human induced change from natural change? =20 Our filming schedule is still relatively fluid at the moment, but we hope to be in Boston around the second week of November. Please don't hesitate to contact me or my producer, Eliya Arman, if you have any further questions, and I look forward to hearing from you soon. =20 Yours sincerely, =20 Jo Locke =20 Jo Locke Assistant Producer WagTV 2d Leroy House 436 Essex Road London N1 3QP t 020 7688 5191 f 020 7688 1702 www.wagtv.com =20