Global warming

            It is getting chilly day today. But you know it is strange weather these days. Recently, global warming has become a big problem for us. Don’t you think so? Co2 is a big problem for us. Carbon dioxide makes summers hotter and winters colder. Our life is changing these days. If we do not use air conditioners, we will have problems. So, we need to use air conditioners. We must think about our lifestyle and our future.   

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