But what is the real reason? There were big vulcano eruptions just after year 1900. This caused the earths temperature to drop quite dramatically. When 70% of the earths surface, the ocean, cools down, the humidity in the atmosphere goes down, resulting in less cloud coverage and less percipitation, and the result is draught. The land masses over central Europe and USA have no clouds, so the temperature rises. In Norway the glacier Engenbreen retracted 2km, over one mile, during the 20'ies and 30'ies, but the temperatures weren't high, as in central Europe and USA. A glacier like Engenbreen is a frozen river. And there is draught because of global cooling, it does't get water, in the form of snow during the winter. Less snow means less ice. And less ice means more retraction of the glacier even in normal temperatures because of less clouds. In my humble opinion, the in a global perspecive local heatwaves in the 30'ies were caused by the global cooling by vulcanos, and the following draught and less clouds.

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The Arctic will be ice free by 2014 due to the effects of climate change