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It is difficult to project the longer run future with any assurance, whether one is concerned with rangeland or with any other natural resource. One has only to recall the great changes that the past one to three generations have brought in every aspect of our lives; he would be wise to assume that the next one to three generations will bring equally great changes. The recent past was not, and could not be, accurately foreseen at the beginning of any past period; and today we are uncertain about the nature of future changes, while at the same time assuming they will be very great. Let us start by briefly recalling some attributes of life in the United States in 1900. In 1900, the total population of the United States was 76 million people; today it is over 200 million. In 1900, the gross national product in current prices was about $20 billion, today in current prices it is about $1,000 billion, or apparently 50 times as much; even at constant prices it would be well over 10 times as much. In 1900 there were only 8,000 registered cars in all of the United States; today, there are over SO million. In 1900 there were no airplanes-the Wright brothers had not yet made their historic flight; today, there are 150,000 airplanes, some with wing span greater than the length of the first flight. In 1900, and long thereafter, there were no space vehicles; today, we have landed several men on the moon, and brought them back safely. In 1900, there was no frozen food industry, no radio, no television, nor any of scores of other production and consumption tech-

Range Management in the United States for the Next One to Three Generations