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28、Possible version:

       Recently, extreme weather frequently appears in different parts of the world．In summer, the temperature reaches as high as over 40   in some places, while in winter, low temperature affects many parts of the world．The extreme weather has led to flood, drought, and the snow, causing great damage to people’s life．

       There are several reasons for the appearance of extreme weather．First, global warming, which means the rise of the earth’s temperature, is worsening year by year．Second, the change of the environment, like the loss of forest, also contributes to the change of weather．Third, air pollution, which is mainly caused by the gases from factories and cars, is one of the most important factors．

       Everyone can do something to change the situation．It is our duty to protect the environment．Living a low-carbon life is one of the ways to achieve the goal．