Two University of Turku (Finland) physicists have determined that even though climate’s sensitivity has risen 0.24°C over the past century, the human contribution to the warming is only about 0.01°C, and the IPCC and climate modeling dramatically overestimate CO2’s climate impact.

The paper titled ‘No experimental evidence for the significant anthropogenic climate change’ was published by Jyrki Kauppinen and Pekka Malmi.

In the paper the study shows that GCM-models used in IPCC report AR5 fail to calculate the influences of the low cloud cover changes on the global temperature. That is why those models give a very small natural temperature change leaving a very large change for the contribution of the green house gases in the observed temperature.

This is the reason why IPCC has to use a very large sensitivity to compensate a too small natural component, according to NoTrickZone. Further they have to leave out the strong negative feedback due to the clouds in order to magnify the sensitivity. In addition, this paper proves that the changes in the low cloud cover fraction practically control the global temperature.

In a the 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).”

Kauppinen and Malmi conclude that global temperatures are controlled primarily by cloud cover and that “only a small part” of the increased carbon dioxide concentration is anthropogenic.

The study also calls into question the claims of the UN IPCC, which concluded that global temperatures are largely driven by human activity, according to Summit news.

While the methods and results of the study can be debated, this once again illustrates how there is no overwhelming consensus on man-made global warming as the media often claims.

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.”

When low cloud cover data from satellite observations are considered, a very clear correlation emerges.

In reality, there are dozens of prominent scientists who believe that climate change is driven by natural forces and that the United Nations’ climate projections are unreliable.

The conclusion of the study shows that the GCM-models used in IPCC report AR5 cannot compute correctly the natural component included in the observed global temperature.

The reason is that the models fail to derive the influences of low cloud cover fraction on the global temperature. A too small natural component results in a too large portion for the contribution of the greenhouse gases like carbon dioxide. That is why