Fritz Vahrenholt, head of the renewable energy arm of RWE and a former hero of the German environmental movement, has been derided in Germany as a lobbyist for the fossil fuel sector after he published a book highly critical of the global warming consensus.
[Vahrenholt] For years I believed the science of the IPCC was solid. I had the famous hockey stick graph (a graph purporting to show that current global temperatures are by far the highest in the last 1000 years, editor) in all my presentations. But then I read the book The Hockey Stick Illusion by Andrew Montford, which is very critical about this graph. Slowly I started to realize we have been misguided by the IPCC about the natural fluctuations in the climate in the past thousands of years. The whole purpose of the IPCC has been to get rid of the so-called Medieval Warm Period, a warm period around the year 1000 when the Vikings settled on Greenland and were able to live there for a couple of centuries. After this warm period we have had the Little Ice Age which coincided with a very quiet sun. Many papers have been published in the last few years which show that the Little Ice Age was not a local European phenomena, as the IPCC suggests. So yes, the IPCC has underestimated the natural fluctuations of the climate and overestimated the role of CO2.
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