160 Yet, the idea of fitting productive activities into the flow of nature, of using but not destroying nature, is the important consideration essential to long-run survival and to long-run survival in comfort. In earlier times, most men were close to the earth and knew intimately the source of their sustenance. Many still do. The causes of productive excesses that occurred may be laid largely either to ignorance of the results that would follow potentially destructive practices such as overgrazing or to a concept of vastness of the earth that seemed to make its bounty all but limitless. Then, of course, there was greed. But men must be concerned with their resources and environment, and although few people would seem so far removed from the earth and the direct concerns for their sustenance than the modern urban American, a consuming public, detached for the most part from the earth, is nonetheless bound to the earth as greatly and dependent upon it as strongly as ever. Survival and survival in comfort depend upon the continued fecundity of the earth and upon an abundant supply of the earth's resources; and it is survival that is essential, not growth. In the course of this study we have attempted to examine the economic growth of the United States