Conservation means development as much as it does protection. I recognize the right and duty of this generation to develop and use the natural resources of our land; but I do not recognize the right to waste them, or to rob, by wasteful use, the generations that come after us. I ask nothing of the nation except that it so behave as each farmer here behaves with reference to his own children. That farmer is a poor creature who skins the land and leaves it worthless to his children. The farmer is a good farmer who, having enabled the land to support himself and to provide for the education of his children leaves it to them a little better than he found it himself. I believe the same thing of a nation.

Theodore Roosevelt (1858–1919) American politician, statesman, conservationist, writer, US President (1901–1909)
Speech (1910-08-31), “The New Nationalism,” John Brown Memorial Park dedication, Osawatomie, Kansas
    (Source)