Global warming is the background of frequent extreme weather and climate events. The World Meteorological Organization pointed out that the global surface temperature in January and April of 2007 were 1.89°C and 1.37°C higher than the historical average for the same period, respectively, exceeding the highest level in 1998 and the highest value for the same period since 1880. In 2006, my country’s annual average temperature was 1.1°C higher than normal, which was the warmest year since 1951. From January to July 2013, my country’s average temperature was 1.4°C higher than the same period in the past year, the highest in history since 1951. It is also the 11th consecutive high year since 1997. The winter temperature in my country is also significantly higher. Since 1986, there have been 21 consecutive warm winters; the highest temperature in Beijing on February 5, 2013 reached 16.0℃, setting a record for the same period in history since the availability of meteorological data in 1840; Nanjing on February 6 The highest temperature reached 23.9℃, which was also the highest temperature in history over the same period in a century.
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