The layout of collage is a timeline from the past to the future. The top of the collage represents the past, meaning pollution. The air is polluted, leading to the temperature rise. After that, I did the bottom of the collage. It represents now and the future, meaning people do not realize that the glacial melting will be more and more series. The result is that polar bears will lose their home. I use a dark hand image to hold a polar bear on small ice, as people do not realize this problem, and the mortality of polar bears will increase.

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