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After a meal in the restaurant, we use the napkin issued by the restaurant to clean the mouth, and then fling aside the used napkins. In fact, we only use 1/4 of a napkin.A fast-growing tree can produce more than 2,000 pieces of napkins.If 100 million people used 1/4 of a napkin, 75 million pieces of napkins might be saved in a meal.This means that we would save 37,500 trees!3 lines are cut on the napkins. The lines will divide a piece of napkin into 4 quadrilaterals that are equal in the area and ready to be torn. After a meal, a part of napkin can be torn upon the demand when it is used to clean the mouth.
Beijing Institute of Technology,
Beijing Institute of Technology,Zhuhai