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Hand escalators need electricity, while the stairs don't, so if we climb the stairs, we can save the energy and the earth, and it is everybody’s business.
We need abstinence to use the energy. Excessive use of energy will shorten the earth's survival time. Since the earth can't do without trees, so the trees are on behalf of the earth. In the poster, on the top of the stairs and the escalators placed two trees, one tree is a luxuriant tree, and the other is a withered one, simple two kinds of colors illustrate the contrast. The uncomplicated illustration represents that one simple little thing/act can save the energy and the earth.
China University of Technology