Book By Vahrenholt – German Warmist Scientist Claims: “I Need Only Two Sentences To Show It’s CO2!”

ARD German public television presented a short clip of Fritz Vahrenholt and the contents of his new book during its early morning show on Monday. ARD had an agitated Prof Mojib Latif on to respond.It is still unclear why Latif is agitated with Vahrenholt to begin with, as they both agree that CO2 is only half responsible for the recent warming.

Most likely it all has something to do with Latif’s love of being in the media limelight. He’ll say anything to get on TV.

Lüning responds to Latif’s TV comedy

Sebastian Lüning, co-author of the book “Die kalte Sonne” together with Vahrenholt, responds to Latif’s comments at his website, which I present in English as follows:

Early risers today were able see a report about “Die kalte Sonne” on the ARD-Morgen magazin. The report gave an overview of the book’s positions and of Fritz Vahrenholt. Then Mojib Latif appeared in the studio, and was visibly agitated with Vahrenholt. In addition to a tirade that is truly worth watching, Latif attempted to refute the book’s main assertions. According to Latif, it could be shown just by looking at the temperature development of the stratosphere that the sun has no big impact on the course of the climate, CO2 and the sun here would lead to completely different developments. Both of these competing climate factors would each have their own characteristic fingerprint, and so it would be possible to distinguish between the two. Latif: ‘Up there 30, 40, 50 kilometers in altitude we are measuring a massive cooling. And that is precisely the effect of of CO2. That can only be explained by CO2…” .

The audience, comprised mainly of laymen, probably were impressed by Latif’s every word. Latif then delivered the knockout punch, and summarized for the audience: ‘That means that I don’t need 400 pages to show it’s the sun. I need a full two sentences to show that it’s CO2.’

Unfortunately for Prof. Latif, stratospheric cooling cannot be in any way a strong indicator for a powerful climate impact by CO2 because:

1) The cooling of the stratosphere occurred mainly during the 1980-1995 phase, a time when the ozone layer was thinned out by FCKW emissions, as the following figure depicts:

Source: Ozone concentration/stratosphere (left) and temperatures/stratosphere (right): Avajon et al. 2007, also see webpage of Prof. Scott Mandia and webpage of Markus Gronotte.

The thinning out of the ozone led to a continuous decline in stratospheric absorbed solar energy, which led to a cooling in the stratosphere. In the 1990s, CFC emissions were cranked back by the Montreal Protocol and the ozone layer has been slowly recovering since 1995. Since 1995 there’s been no significant temperature changes – the values have been oscillating about a plateau.

For Latif, explaining why CO2 is the dominant driver can be done in only two sentences. Exposing these people for who they really are is turning out to be much easier than imagined. In the interview he says he did not even buy the book, and that he only read a few excerpts of it. Latif is not serious with his conclusion on the book.


6 responses to “Book By Vahrenholt – German Warmist Scientist Claims: “I Need Only Two Sentences To Show It’s CO2!””

  1. DirkH

    There’s another idea. Wouldn’t a reduction in cloudiness lead to surface warming and stratospheric cooling as well, as the clouds would reflect less sunlight? With a cloudy sky, the same sunlight passes through the stratosphere twice. Without clouds, only once.
    search for the word “cloud” to find a time series of global cloudiness. Matches the stratospheric cooling well, methinks.

    Latif’s “It can only be CO2” looks like this guy has such a strong confirmation bias that he is completely useless as a scientist.

  2. DirkH

    Erl Happ says it’s the Ozone; and he says the Ozone content correlates inversely with SST; no FCKWs needed…

  3. Rudolf Kipp

    Interesting is his main argument. It cannot be the sun (an thus only CO2), because if it would be the sun, the atmosphere would heat evenly, and we would not have stratospheric cooling.

    This sounds like, the only influence by the sun, Latif can imagine, is via more heat through an increased TSI. This guy obviously never has heared about Svensmarck…

    Anyway, Latif always has been very flexible in adapting his opinion to the “new reality”. He is famous for his statement in Der Spiegel in 2000, where he said that “strong winters with heavy frost and lots of snow” would be “a thing of the past”.

    8 years later he obviously kind of changed his mind (together with Keenlyside in Nature):

    “Our results suggest that global surface temperature may not increase over the next decade”

    But my No. 1 favourite of all Latif quotes comes from the World Climate Conference 3 (Slides and audio can be downloaded on the website), on September 1st 2009 in Geneva:

    [25:58] “It may well happen that we enter a decade – or maybe even two – when the temperature cools”

    This statement is pretty much in line with what Varenholt says… But it gets better:

    [40:05] ““I am not one of the sceptics, okay? If my name was not Mojib Latif, It would be Global Warming. However, we have to ask the nasty questions ourselves or other people will do it.

    And, who would have thought. Latif is even very sceptical about the capability of climate models:

    [37:04] “No Prediction without observations. Model biases – this is really an issue here. This is from the latest IPCC-report, this is just the ensemble mean error in surfavce air temperature. And you see even in the ensemble mean you have errors of several degrees. In some models you have errors of up to ten degrees. Ten degrees, okay? And so I think, we should be very cautious to take these models as kind of realistic, or just apply some correction methods and believe that these models would really provide some realistic information. They are not useless, okay? But I think we should keep in mind that there have been large biases and we should really work on the models to improve them.”

  4. Ed Caryl

    It’s amazing that Prof. Latif doesn’t know the difference between claiming something and proving something. All they have is the arrogant appeal to authority.

  5. Ed Caryl

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