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https://arxiv.org/pdf/1907.00165.pdfWe have proven that the GCM-models used in IPCC report AR5 cannot computecorrectly the natural component included in the observed global temperature. Thereason is that the models fail to derive the influences of low cloud cover fractionon the global temperature. A too small natural component results in a too largeportion for the contribution of the greenhouse gases like carbon dioxide. That is why6 J. KAUPPINEN AND P. MALMIIPCC represents the climate sensitivity more than one order of magnitude largerthan our sensitivity 0.24°C. Because the anthropogenic portion in the increasedCO2 is less than 10 %, we have practically no anthropogenic climate change. Thelow clouds control mainly the global temperature.
A good read. Well worth the time, even if you do not agree with their conclusions.