No one can predict accurately just what the rate of growth of the United States will be. Methods for projecting past trends have been developed by which projections can be made under various assumptions. The Resources for the Future population projections for the United States range from 225 million to 278 million in 1980, and from 267 million to 431 million in the year 2000. Along with these population projections Resources for the Future estimated that our gross national product, currently at about the $500 billion level, would reach to between $960 billion and $1,260 billion in 1980, and the Federal Reserve Board index of industrial production would increase from 134 in 1958, to between 303 and 437 in 1980. This index is based on levels prevailing in 1947-49 as equal to 100. Middle ranges of these projections were adopted as the basis for studies for the committee. For 1980, this contemplated a population of 244 million, gross national product of $1,060 billion, and an index of industrial production of 355. It is recognized, of course, that many factors not now determinable will affect these estimates.