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'I Feel Duped on Climate Change'
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Will reduced solar activity counteract global warming in the coming decades? That is what outgoing German electric utility executive Fritz Vahrenholt claims in a new book. In an interview with SPIEGEL, he argues that the official United Nations forecasts on the severity of climate change are overstated and supported by weak science.
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The articulate utility executive is nervous at the beginning of the conversation. He is groping for words -- not a common occurrence for the practiced provocateur. After all, Fritz Vahrenholt, 62, who holds a doctorate in chemistry, has been a rebel throughout his life. "Perhaps it's just part of my generation," he says.
He is typical of someone who came of age during the student protest movement of the late 1960s, and who fought against the chemical industry's toxic manufacturing plants in the 1970s. His party, Germany's center-left Social Democratic Party (SPD), chose him as environment senator in the city-state of Hamburg, where he incurred the wrath of the environmental lobby by building a waste incineration plant, earning him the nickname "Feuerfritze" (Fire Fritz). He worked in industry after that, first for oil multinational Shell and then for wind turbine maker RePower, which he helped develop. Now, as the outgoing CEO of the renewable energy group RWE Innogy, he is about to embark on his next major battle. "I'm going to make enemies in all camps," he says.
He wants to break a taboo. "The climate catastrophe is not occurring," he writes in his book "Die Kalte Sonne" (The Cold Sun), published by Hoffmann and Campe, which will be in bookstores next week.
He has only given the book to one climatologist, Jochem Marotzke, the director of the Max Planck Institute for Meteorology in Hamburg, to read prior to its publication. Marotzke's assessment is clear: Vahrenholt represents the standpoints of climate skeptics. "A number of the hypotheses in the book were refuted long ago," Marotzke claims, but adds, on a self-critical note, that his profession has neglected to explain that global temperatures will not increase uniformly. Instead, says Marotzke, there could also be phases of stagnation and even minor declines in temperature. "This has exposed us to potential criticism," he says.
While books by climate heretics usually receive little attention, it could be different in Vahrenholt's case. "His fame," says Marotzke, "will ensure that there will be a debate on the issue."
The book is a source of discomfort within Vahrenholt's party. No one with the SPD leadership is willing to comment on the theories of their prominent fellow party member, from former Environment Minister and current SPD Chairman Sigmar Gabriel to parliamentary floor leader Frank-Walter Steinmeier, who was given an advance copy of the book.
A lecture Vahrenholt was scheduled to give at the University of Osnabrück in northwestern Germany was recently cancelled.
SPIEGEL: Mr. Vahrenholt, in the week before last, you made the surprising announcement that you are resigning as head of RWE Innogy. And now your book "Die Kalte Sonne," in which you deny the climate catastrophe, is appearing. Were you forced to step down because your ideas could damage RWE's new green image?
Vahrenholt: No. My contract would have expired at the end of the year, anyway. Besides, I will continue to be a member of the company's supervisory board for another three years.
SPIEGEL: How have your fellow executives responded to your provocative prediction that it will get colder instead of warmer in the coming decades?
Vahrenholt: This is not an RWE book. Aside from CEO Jürgen Grossmann, I didn't give an advance copy to anyone in the company. Grossmann, at any rate, found it so engrossing that he read the entire book in one night.
SPIEGEL: Nevertheless, your precipitous withdrawal from RWE management is reminiscent of the scandal surrounding Thilo Sarrazin, who was forced to resign from the board of Germany's central bank in 2010 following the publication of his controversial book on immigration and integration.
Vahrenholt: This isn't a precipitous withdrawal. Besides, I don't need Thilo Sarrazin as a role model. I also didn't need a role model when I drew attention to risks in the chemical industry in my 1978 book "Seveso ist überall" (ed's. note: Seveso is Everywhere -- a reference to the infamous Seveso chemical spill in 1976 in Italy). Today, I want new scientific findings to be included in the climate debate. It would then become clear that the simple equation that CO2 and other man-made greenhouse gases are almost exclusively responsible for climate change is unsustainable. It hasn't gotten any warmer on this planet in almost 14 years, despite continued increases in CO2 emissions. Established climate science has to come up with an answer to that.
SPIEGEL: You are an electric utility executive by profession. What prompted you to get involved in climatology?
Vahrenholt: In my experience as an energy expert, I learned that the Intergovernmental Panel on Climate Change (IPCC) is more of a political than a scientific body. As a rapporteur on renewable energy, I witnessed how thin the factual basis is for predictions that are made at the IPCC. In one case, a Greenpeace activist's absurd claim that 80 percent of the world's energy supply could soon be coming from renewable sources was assumed without scrutiny. This prompted me to examine the IPCC report more carefully.
SPIEGEL: And what was your conclusion?
Vahrenholt: The long version of the IPCC report does mention natural causes of climate change, like the sun and oscillating ocean currents. But they no longer appear in the summary for politicians. They were simply edited out. To this day, many decision-makers don't know that new studies have seriously questioned the dominance of CO2. CO2 alone will never cause a warming of more than 2 degrees Celsius (3.6 degrees Fahrenheit) by the end of the century. Only with the help of supposed amplification effects, especially water vapor, do the computers arrive at a drastic temperature increase. I say that global warming will remain below two degrees by the end of the century. This is an eminently political message, but it's also good news.
SPIEGEL: You make concrete statements on how much human activity contributes to climatic events and how much of a role natural factors play. Why don't you publish your prognoses in a professional journal?
Vahrenholt: Because I don't engage in my own climate research. Besides, I don't have a supercomputer in my basement. For the most part, my co-author, geologist Sebastian Lüning, and I merely summarize what scientists have published in professional journals -- just as the IPCC does. The book is also a platform for scientists who apply good arguments in diverging from the views of the IPCC. The established climate models have failed across the board because they cannot cogently explain the absence of warming.
SPIEGEL: You claim that the standstill has to do with the sun. What makes you so sure?
Vahrenholt: In terms of the climate, we have seen a cyclical up and down for the last 7,000 years, long before man began emitting CO2 into the atmosphere. There has been a warming phase every 1,000 years, including the Roman, the Medieval and the current warm periods. All of these warm periods consistently coincided with strong solar activity. In addition to this large fluctuation in activity, there is also a 210-year and an 87-year natural cycle of the sun. Ignoring these would be a serious mistake …
SPIEGEL: … but solar researchers are still in disagreement over whether the cycles you mention actually exist. What do you think this means for the future?
Vahrenholt: In the second half of the 20th century, the sun was more active than it had been in more than 2,000 years. This "large solar maximum," as astronomers call it, has contributed at least as much to global warming as the greenhouse gas CO2. But the sun has been getting weaker since 2005, and it will continue to do so in the next few decades. Consequently, we can only expect cooling from the sun for now.
SPIEGEL: It is undisputed that fluctuations in solar activity can influence the climate. Most experts assume that an unusually long solar minimum, evidenced by the very small number of sunspots at the time, led to the "Little Ice Age" that began in 1645. There were many severe winters at the time, with rivers freezing over. However, astrophysicists still don't know the extent to which solar fluctuations actually affect temperatures.
Vahrenholt: Many scientists assume that the temperature changes by more than 1 degree Celsius for the 1,000-year cycle and by up to 0.7 degrees Celsius for the smaller cycles. Climatologists should be putting a far greater effort into finding ways to more accurately determine the effects of the sun on climate. For the IPCC and the politicians it influences, CO2 is practically the only factor. The importance of the sun for the climate is systematically underestimated, and the importance of CO2 is systematically overestimated. As a result, all climate predictions are based on the wrong underlying facts.
SPIEGEL: But you are doing exactly what you criticize climatologists of doing: Using a thin body of data, you make exact predictions. In your book, you estimate the sun's influence on the climate down to the last 0.1 degrees. No one can do that.
- Part 1: 'I Feel Duped on Climate Change'
- Part 2: 'Dozens of Solar Researchers Agree with Me'
We can’t go on this way, and we wont…
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