I think the main reason that is the human-caused pollution or other activity which is leading to global warming.
As a student who will go to the college soon,firstly,we should save the energy,fo example,turn off the unused electrical appliances.Secondly,we can also use the things that are used from the recycled meterial.Thirdly,we should take care of the trees and animals.The last ,when you see somebody wasting the energy or doing harm for the nuture,you should point in out and keep him from doing it.
帮忙改下错误,顺便打个分数~满分30,按高考水平打分就可以~谢谢!!
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