Although there were some fluctuations in the middle, the main trend of average temperature of each decade is rising, from 13.8 Celsius degree in 1890 to 14.6 Celsius degree in 2005. There was a small dip at the beginning in the curve. Then the average temperature kept climbing gradually until 1950, followed by a down trend. From 1970, the average temperature of each decade started rising again until 2005, however, at a rate much higher than before. The fluctuation seems reasonable in the first half of this century. Nonetheless, the recent temperature rising is rapidly enough to warn us the emerging of Global Warming.
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