Two University of Turku (Finland) physicists have determined a) the climate’s sensitivity to a doubling of CO2 is 0.24°C, b) the human contribution to the warming of the past century is only about 0.01°C, c) the IPCC and climate modeling dramatically overestimate CO2’s climate impact, and d) variations in low cloud cover control the climate.
Cloud cover changes “explain the linear trend of global temperature” since the 1980s
In a new paper, O.M. Povrovsky of the Russian State Hydrometeorological University analyzes satellite-observed cloud cover changes during 1983-2009 and their relation to global temperature change.
Povrovsky found global and regional cloudiness decreased between 2-6% during these decades, and “the correlation coefficient between the global cloud series on the one hand and the global air and ocean surface temperature series on the other hand reaches values (–0.84) — (–0.86).”
Consequently, Povrovsky (2019) concluded changes in cloud cover explain both the increasing global temperature during 1984-2009, but even the interannual variability.
Anthropogenic climate change isn’t supported by experimental evidence
Dr. Jyrki Kauppinen was an expert reviewer for the IPPC’s last climate report (AR5, 2013).
In a comment to the IPCC overseers, Kauppinen strongly suggested the “experimental evidence for the very large sensitivity [to anthropogenic CO2 forcing] presented in the report” is missing (Kauppinen and Malmi, 2019).
In response, the IPCC overseers claimed experimental evidence could be found in the report’s Technical Summary.
But the Technical Summary merely contained references to computer models and non-validated assumptions. Kauppinen writes:
“We do not consider computational results as experimental evidence. Especially the results obtained by climate models are questionable because the results are conflicting with each other.”
Upon examination of satellite data and cloud cover changes, Dr. Kauppinen concluded the IPCC’s claims of high climate sensitivity to CO2 forcing (2 to 5°C) are about ten times too high, and “the models fail to derive the influences of low cloud cover fraction on the global temperature.”
Evidence for natural climate change supported by satellite observations
When low cloud cover data from satellite observations are considered, a very clear correlation emerges.
As low cloud cover decreases, more solar radiation can be absorbed by the oceans rather than reflected back to space. Thus, decadal-scale decreases in low cloud cover elicit warming.
When cloud cover increases, cooling ensues.
In this manner, Kauppien and Malmi (2019) find “low clouds practically control the global temperature,” which leaves “no room for the contribution of greenhouse gases i.e. anthropogenic forcing.”
In fact, Kauppinen and Malmi boldly conclude that the total warming contribution from anthropogenic CO2 emissions reached only 0.o1°C during the last 100 years, which means “anthropogenic climate change does not exist in practice.”