In Tokyo the average number of days with sub-freezing temperatures decreased by 95 percent over the course of the 20th century, reflecting the advance of global warming, according to the Meteorological Agency.

Newly released data show that in the first 10 years of the century, there were an average of 61.7 subzero days in the city each year. By the 1990s, however, that number had fallen to just 3.2.

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