Abstract
The American nation is presently caught in the throes of its third conservation movement. It is generally considered that the first American conservation movement in the United States took place during the period 1890–1920, with particular emphasis upon the first decade of the twentieth century, and the second was associated with the New Deal and subsequent policies of Franklin Roosevelt in the period 1933–43. The aim of this paper is to compare the development and the underlying philosophies of the present conservation movement in the United States with the growth and guiding principles of its two predecessors, and to follow this analysis through with a somewhat more normative examination of various implications for public policy which come to light.

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