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Pinchot's warning cry was startling: "The growth of our forests is but one-third of the annual cut; and we have in store timber enough for only twenty or thirty years at our present rate of use.... Our coal supplies are so far from being inexhaustible that if the increasing rate of consumption shown by the figures of the last seventy-five years continues to prevail, our supplies of anthracite coal will last but fifty years and of bituminous coal less than two hundred years.... Many oil and gas fields, as in Pennsylvania, West Virginia, and the Mississippi Valley, have already failed, yet vast quantities of gas continue to be poured into the air and great quantities of oil into the streams.
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