2017年夏季,北半球多个国家和地区遭遇高温、干旱、洪水等极端天气,随之而来的各种灾害和事故严重影响人们的生产生活,更警示人类气候变化的威胁不可忽视。2017年7月,智利首都圣地亚哥遭遇了10年来最严重的暴风雪,气温骤降到零摄氏度以下。当地气象专家表示,尽管智利此时正处冬季,但这种规模的 In the summer of 2017, many countries and regions in the northern hemisphere experienced extreme weather conditions such as high temperatures, droughts and floods. Various disasters and accidents that followed have seriously affected people’s livelihood and warned that the threat to humankind’s climate change can not be ignored. July 2017, Santiago de Chile suffered the worst snowstorm in 10 years and the temperature plunged below zero degrees Celsius. Local weather experts said that although Chile is now in winter, but this size