|This article was written by M. A. Rodger and was originally posted at DeSmogBlog and is syndicated by an informal agreement and with the express permission of both the author and DeSmogBlog, without payment or charge.|
|This is the second in a series of posts on the educational charity and climate sceptic “think-tank” Global Warming Policy Foundation (GWPF). The first post examined GWPF”s organisation and its principles (or lack of them). Here we examine GWPF”s Briefing Paper No2 – The Sahel Is Greening by Philipp Mueller who is the Assistant Director of the GWPF. Coverage of the greening Sahel has been in the media for a decade now, so this cannot be too controversial a subject, can it?
GWPF BRIEFING PAPER No2 – SIGNIFICANCE OF THE SUBJECT
“Global warming has both positive and negative impacts. However, very often only the negative consequences are reported and the positive ones omitted. This article will show an example of a positive effect of warming.”
Mueller then sets out to show how the Sahel is enjoying a “positive impact” of global warming.
Yet already here is a glaring omission. Despite this being an ideal opportunity to list out all the other “positive impacts”, Mueller fails even to hint at what any of the others might be. Never mind. We still have the Sahel. Or do we?
THE GREENING OF THE SAHEL – MUELLER”S VERSION
This account makes bold statements but can it all be true?
DO PIGS FLY?
After droughts end, things grow greener. That is natural. The Sahel has a delicate climate and research shows that increased human emissions were more likely the cause of the initial drought rather than the cause of the re-greening. The recovery is also very patchy. Drought and famine, declining crops as well as encroaching deserts continue to plague parts of the Sahel, to the point that the description “greening” remains a subject for debate. Mueller”s rosy account fails to tell us any of this.
It is wild speculation to assert that any recovery in the Sahel is a result of global warming and to dangle the prospect of a future green Sahara is the exact opposite of the message provided by Mueller”s reference on the matter. However welcome the re-greening of parts of the Sahel, it cannot be relied on.
Mueller does mention this in passing but he fails to mention the confident scientific finding that any re-greening will eventually be reversed in the future. So if this greening of the Sahel is the prime example of the “positive impacts” of global warming, it is no surprise that Mueller fails to list any of the others.
A second GWPF Briefing Paper will be the subject of the next post in this series. Hopefully it will prove to be more factual in nature than Briefing Paper No2.
APPENDIX – Details of Omissions & Misrepresentations within Mueller”s paper.
A1 – OMISSION
The causes of the drought have slowly become better understood. Rising population and over-grazing by livestock was the first theory but studies now show the drought resulted from changes in ocean surface temperatures Folland et al (1986) Giannini et al (2003)which are likely due in part to the sulphate aerosol pollution of Europe and North America Rotstayn & Lohmann (2002) Biasutti & Gainnini (2006) and thus it is the cleaning of emissions from power stations that has likely allowed the rains to return.
Mueller remains entirely silent about the potential role of sulphate aerosols in causing the drought and the subsequent greening. It is difficult to understand his silence as these findings are well known. Perhaps the potential role of human pollution in causing a “devastating drought” sits too uncomfortably with the intended message of “positive impacts” from global warming.
A2 – OMISSION
Climatology may not provide the best reports of the events but the Sahel drought is reported in newspapers and the humanitarian aid networks. “In 2005, drought and famine hit the Sahel, claiming many lives. The pattern was repeated in 2010 with the crisis most acute in Niger. And now the early warning signs are there for problems again in 2012.” For Mueller to entirely miss such prominent reporting in the age of the internet is truly remarkable!
A3 – OMISSION
What Mueller totally misses in Olsson”s paper is the preceding sentence and the following half sentence which says – “After many years of dwindling food production in the Sahel, only two countries show signs of improved agricultural performance. …while the other Sahelian countries show decreases in their production.” So Mueller omits to mention the situation in the other nine countries of the Sahel, instead concentrating on the two countries where the evidence doesn”t directly contradict his theorizing.
A4 – MISREPRESENTATION
This concerns greening within the deserts of Western Sahara, a much-troubled country that is in Africa but definitely not part of the Sahel! It is from the same Heartland report that Mueller times the start of the greening as “since the early 1980s” when if he had read the other more reliable references he cited he would have known the greening began in 1994.
The entirety of the Sahel is not greening as Mueller would have us believe. It is patchy and there remains enough areas still suffering encroaching desert to make the term "greening" debatable. Somehow Mueller fails to notice.
A5 – MISREPRESENTATION
But when it comes to the greening of the Sahel, Idso makes clear the CO2 link is only speculation and makes do with pointing out where researchers fail to mention his brave theorising.
A6 – MISREPRESENTATION
This is an exceedingly bizarre interpretation of the source document! Claussen”s quote actually says “some expansion of vegetation into today”s Sahara is theoretically possible”,(end quote, emphasis added) words too pessimistic for Mueller so he changed them.
Not only does Mueller misquote Claussen, he wholly ignores the explicit warning that Claussen makes against any belief in a future green Sahara. “But he(Claussen) warns against believing the mid-Holocene climate optimum will be recreated.” This source document continues by pointing to the continuing tree-loss in the Sahel and the shrinkage of Lake Chad; this despite the improved levels of rainfall.
Indeed, Claussen is not alone in dismissing a green Sahara. Yet Mueller”s report concludes that a green Sahara is a distinct possibility, the exact opposite of the very authority that he claims is supporting his conclusions.
A7 – OMISSION
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