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Not only the sun is to blame for global warming

17.11.2013

Solar activity plays a minimal role in global warming - studies by scientists from the universities of Lancaster and Durham show. Changes in solar activity are responsible for no more than 10% of global warming in the XNUMXth century.

Some scientists believe that global warming is not caused by the activities of mankind, but by the change in the amount of energy that the Earth receives from the Sun. There is a hypothesis that cosmic rays play a role in the cooling of the Earth, helping to form clouds that reflect the sun's rays into space and thus cool the planet. According to the hypothesis, during periods of high solar activity, part of the cosmic rays entering the Earth's atmosphere is blocked. Because of this, fewer clouds form and global temperatures rise.

However, in a recent study, scientists concluded that neither changes in the Sun's activity nor its effect on cosmic ray blocking could have a significant impact on global warming. Scientists have analyzed data on solar activity and global temperatures since 1955. The researchers found little correlation between 22-year solar activity cycles and global temperature increases, but the difference between flares and temperature increases is 1-2 years, and most likely the temperature change is due to the direct influence of the Sun, and not the blocking of cosmic rays. In general, the contribution of changes in solar activity, either directly or through cosmic rays, could not have been more than 10% of global warming in the XNUMXth century.

The scientists also concluded that the paleontological evidence obtained by analyzing carbon and oxygen isotopes was "weak and confusing." In addition, the studies linking cosmic ray blocking to low cloud cover only covered certain regions, not the entire planet. The researchers also did not find evidence of the "guilt" of the Sun in global warming and in the study of CERN experiments, where they are trying to simulate the processes in which cosmic rays can ionize aerosols in the atmosphere. Neither these experiments, nor real large-scale cases of atmospheric ionization, such as the accident at the Chernobyl nuclear power plant, indicate a connection with changes in the effect of cosmic radiation on cloudiness.

Thus, the attempt to "shift the blame" for global warming on the Sun has no scientific basis. The hypothesis that solar activity indirectly reduces the amount of clouds is not confirmed, and other causes of warming, other than human activity, are rather difficult to find.

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