Historical data show that weather has usually been more extreme during colder periods. This was especially the case during the centuries-long Little Ice Age that ended about 1850. For example, Chinese scientists report that "typhoon frequency seemed to have increased at least regionally during the coldest phases of the Little Ice Age." Global warming apparently reduces tropical cyclone activity over all time frames. Perhaps this is why, in 2012, we are near a 30-year low in worldwide "Accumulated Cyclone Energy," as can be seen here.
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