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People always apply a piece of sheet lightly on the wind outlet to check if an air conditioner is on or not. By trimming the sheet into the shapes of endangered animals, such as a polar bear or a penguin, we can perceive their agony as they are struggling for life on the outlet. If we remember to turn off the air conditioner while leaving the room, the energy consumption can be reduced .It will cause less impact on the environment and, thus, millions of lives could be saved.
Szu-Yu, Liu; Ming-Yu, Tseng