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The word conservation has a thrifty (节俭) meaning. To conserve is to save and protect, to leave what we ourselves enjoy in such good condition that others may also share the enjoyment. Our forefathers had no idea the human population would increase faster than the supplies of raw materials; most of them, even until very recently, had the foolish idea that the treasures were "limitless" and "inexhaustible". Most of the citizens of earlier generations ’knew little or nothing,about the complicated and delicate system that runs all through nature, and which means that, as in a living body, an unhealthy condition of one part will sooner or later be harmful to all the others.
Fifty years ago nature study was not part of the school work; scientific forestry was a new idea; timber was still cheap because it could be bought in any quantity from distant woodlands; soil destruction and river floods were not national problems and nobody
A. we plant more trees
B. we be taught environmental science, as well as the science of plants
C. environmental education be directed toward everyone
D. we return to nature
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