Today, we have national disasters all over the world such as tyhoon and heavy rain. In 20th century, we had twenty-two nationaldisaster by which we were lost over 20 billion dollors. ( I'm not sure wether they are 20 billion or not) . Why these phenomenon occered?
Scientists think it is global warming. It is broke out by " Greenhouse efffect " Greenhouse effect is the effect such as greenhouse. In greenhouse , the tempareture in the place rises by plastic which coverｓ the greenhouse.
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