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The topic of this poster is about global warming. Many people turn a blind eye to global warming, just like the color blind can't distinguish number or image on the color blindness cards. By using the pattern of color blindness card, lightness of blue color which stands for the rising sea water is changed, thus it shows that the polar bear is nearly drowned by rising sea water due to global warming, but it is not so easy to recognize it at first sight. This poster aims at calling on people to take actions in time to prevent global warming.