The Mona Loa laboratory in Hawaii has published the monthly mean reading of atmospheric carbon dioxide for February 2013. The figures make uncomfortable reading. In February 2012 the content was 393.54 parts per million. In February 2013 this had risen to 396.80 parts per million.
The readings are taken at an altitude of 3400 metres. The atmospheric concentration of carbon dioxide will be different is a mean figure is found for the whole surface of the earth at mean sea level, if such a finding were possible.
There is an average seasonal cycle for carbon dioxide concentration at Mona Loa, which is adjusted to get this figure of 396.8 ppm. In 1960 the reading was 317 ppm. The increasing atmospheric concentration of carbon dioxide is undeniable. It is difficult, having regard to the properties of atmospheric carbon dioxide which prevents energy from escaping the biosphere to see how such an increase will not have an effect on our climate, which is governed by the laws of physics. It is always possible that the laws of physics as we understand them are wrong, but only a fool would make decisions on that basis.
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