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Most of Europe will remember the first two weeks of February 2012 as the coldest in a long time – as a matter of fact since 1985. At its origin was a dense Siberian high-pressure system with abnormally high surface pressures, on occasion reaching 1060 hPa (MSL).
The Montreal Protocol on Substances that Deplete the Ozone Layer is effective: the production and consumption of chlorofluorocarbons and halons has stopped. The atmospheric concentration of chlorine-and bromine-containing compounds is...