"Harrison Brown's most remarkable book, The Challenge of Man's Future, was published more than three decades ago. By the time I read it as a high school student a few years later, the book had been widely acclaimed.... The Challenge of Man's Future pulled these interests together for me in a way that transformed my thinking about the world and about the sort of career I wanted to pursue. I have always suspected that I am not the only member of my generation whose aspirations and subsequent career were changed by this book of Harrison Brown's.... As a demonstration of the power of (and necessity for) an interdisciplinary approach to global problems, the book was a tour de force.... Thirty years after Harrison Brown elaborated these positions, it remains difficult to improve on them as a coherent depiction of the perils and challenges we face. Brown's accomplishment in writing The Challenge of Man's Future, of course, was not simply the construction of this sweeping schema for understanding the human predicament; more remarkable was (and is) the combination of logic, thoroughness, clarity, and force with which he marshalled data and argumentation on every element of the problem and on their interconnections. It is a book, in short, that should have reshaped permanently the perceptions of all serious analysts...."
— John Holdren, in Earth and the Human Future: Essays in Honor of Harrison Brown |
"I owe thanks for insight and inspiration to several late mentors (among them Harrison Brown, Roger Revelle, Gilbert White, Jerome Wiesner, Harvey Brooks, and Joseph Rotblat)..."Holdren then calls The Challenge of Man's Future "prescient":
"This was the key insight in Paul Ehrlich's The Population Bomb (Ballantine, New York, 1968), as well as one of those in Harrison Brown's prescient earlier book, The Challenge of Man's Future (Viking, New York, 1954). The elementary but discomfiting truth of it may account for the vast amount of ink, paper, and angry energy that has been expended trying in vain to refute it."At the AAAP site news story about Holdren's speech, you can download his PowerPoint presentation, the very first slide of which glowingly quotes Harrison Brown, and on which Holdren says,
"My pre-occupation with the great problems at the intersection of science and technology with the human condition—and with the interconnectedness of these problems with each other—began when I read The Challenge of Man's Future in high school. I later worked with Harrison Brown at Caltech."Remember -- all these statements are very recent, from 2007. So the connection between the two scientists remains deep and is still current.
Is there anything that can be done to prevent the long-range degeneration of human stock? Unfortunately, at the present time there is little, other than to prevent breeding in persons who present glaring deficiencies clearly dangerous to society and which are known to be of a hereditary nature. Thus we could sterilize or in other ways discourage the mating of the feeble-minded. We could go further and systematically attempt to prune from society, by prohibiting them from breeding, persons suffering from serious inheritable forms of physical defects, such as congenital deafness, dumbness, blindness, or absence of limbs. |
First, man can discourage unfit persons from breeding. Second, he can encourage breeding by those persons who are judged fit on the basis of physical and mental testing and examinations of the records of their ancestors. |
Priorities for artificial insemination could be given to healthy women of high intelligence whose ancestors possessed no dangerous genetic defects. Conversely, priorities for abortions could be given to less intelligent persons of biologically unsound stock.
Such steps would undoubtedly contribute substantially to a slowing down of species deterioration. But it is clear that they would by no means be sufficient. A broad eugenics program would have to be formulated which would aid in the establishment of policies that would encourage able and healthy persons to have several offspring and discourage the unfit from breeding at excessive rates. |
INTRODUCTION
JOHN P. HOLDREN Harrison Brown's most remarkable book, The Challenge of Man's Future (Viking, 1954; reprinted by Westview, 1984), was published more than three decades ago. By the time I read it as a high school student a few years later, the book had been widely acclaimed as a monumental survey of the human prospect, illuminated through analysis of the interaction of population, technology, and the resources of the physical world. I knew even before high school that science and technology held special interest for me, and I suppose I also had some prior interest in the larger human condition. But The Challenge of Man's Future pulled these interests together for me in a way that transformed my thinking about the world and about the sort of career I wanted to pursue. I have always suspected that I am not the only member of my generation whose aspirations and subsequent career were changed by this book of Harrison Brown's. What was so special about the book? Perhaps most impressive at the time was the combination of audacity and erudition with which Brown wove together insights from anthropology, history, economics, geochemistry, biology, and the study of technology to provide a coherent, multidimensional picture of his subject—how humans have provided themselves with the physical ingredients of existence in the past, their prospects for doing so in the future, and the connections between these matters and the sociopolitical dimensions of the human condition. As a demonstration of the power of (and necessity for) an interdisciplinary approach to global problems, the book was a tour de force. |
Precise control of population can never be made completely compatible with the concept of a free society; on the other hand, neither can the automobile, the machine gun, or the atomic bomb. Whenever several persons live together in a small area, rules of behavior are necessary. Just as we have rules designed to keep us from killing one another with our automobiles, so there must be rules that keep us from killing one another with our fluctuating breeding habits and with our lack of attention to the soundness of our individual genetic stock. |
Although there are admittedly numerous individual fluctuations, it does appear that the feeble-minded, the morons, the dull and backward, and the lower-than-average persons in our society are outbreeding the superior ones at the present time. Indeed, it has been estimated that the average Intelligence Quotient of Western population as a whole is probably decreasing significantly with each succeeding generation. |
Traffic accidents tend to remove the reckless, the inattentive, and persons unable to judge time and distance at high speeds. Among children as well as adults, accidents of all types tend to remove from society persons who cannot obey instructions or heed warnings. General pressures of living tend to select in favor of persons who can adjust themselves to city and to factory life. Among the laboring groups, selection effects favor those who can work with groups and who can follow instructions meticulously. |
Thirty years after Harrison Brown elaborated these positions, it remains difficult to improve on them as a coherent depiction of the perils and challenges we face.
Brown's accomplishment in writing The Challenge of Man's Future, of course, was not simply the construction of this sweeping schema for understanding the human predicament; more remarkable was (and is) the combination of logic, thoroughness, clarity, and force with which he marshalled data and argumentation on every element of the problem and on their interconnections. It is a book, in short, that should have reshaped permanently the perceptions of all serious analysts about the interactions of the demographic, biological, geophysical, technological, economic, and soclopolitical dimensions of contemporary problems. That it failed to do so—that the world is still full of analysts who are generally regarded as serious despite their insistence that problems of population, resources, the rich-poor gap, and the prospects for war or peace are all separate issues—must be an even greater disappointment to Harrison Brown than to those of us who have been restating his points (usually less eloquently) in the three decades since he first made them. |
We cannot hope to carry out a planned evolution of our species for the simple reason that we haven't the slightest idea of what we want, and no mechanism is available that will permit us to determine what we want. A "super-race" of men or a panel of gods could examine us objectively and plan a wise pattern. But in the absence of either, we will probably remain pretty much as we are for hundreds of thousands of years. |
In the first place, it is amply clear that population stabilization and a world composed of completely independent sovereign states are incompatible. Populations cannot be stabilized by agreement any more than levels of armament can be stabilized by agreement. And, as in the latter case, a world authority is needed which has the power of making, interpreting, and enforcing, within specified spheres, laws which are directly applicable to the individual. Indeed, population stabilization is one of the two major problems with which a world government must necessarily concern itself.
Given a world authority with jurisdiction over population problems, the task of assessing maximum permissible population levels on a regional basis need not be prohibitively difficult. |
In the world of my imagination there is organization, but it is as decentralized as possible, compatible with the requirements for survival. There is a world government, but it exists solely for the purpose of preventing war and stabilizing population, and its powers are irrevocably restricted. The government exists for man rather than man for the government. |
Briefly, such a control system would operate in the following manner. Let us suppose that in a given year the birth rate exceeds the death rate by a certain amount, thus resulting in a population increase. During the following year the number of permitted inseminations is decreased, and the number of permitted abortions is increased, in such a way that the birth rate is lowered by the requisite amount. If the death rate exceeds the birth rate, the number of permitted inseminations would be increased while the number of abortions would be decreased. The number of abortions and artificial inseminations permitted in a given year would be determined completely by the difference between the number of deaths and the number of births in the year previous.
It can be argued that such a procedure would be ruthless and would deprive many people of their individual liberties. Yet would it be any more ruthless than the policy which is now followed in the United States? |
I should emphasize, therefore, that my contribution is written in what I take to be the spirit in which Harrison wrote The Challenge of Man's Future—that is, the conviction that it is necessary to dwell on the perils in order to stimulate timely action to avoid or minimize them.
... To put too much emphasis on the correctness or incorrectness of particular predictions, however, is to miss the main point of writing usefully about the future. The idea is not to be "right," but to illuminate the possibilities in a way that both stimulates sensible debate about the sort of future we want and facilitates sound decisions about getting from here to there. This philosophy has informed Harrison Brown's writing about the human future throughout the four decades in which he has been doing it. Our understanding of the dimensions of the human predicament—and of what might be done to alleviate it—is much the better for his effort. ... The mid-twentieth-century revival of Malthus's insight that no combination of good technology and good management can cope with unlimited population growth on a finite planet (a revival to which Harrison Brown's 1954 book, The Challenge of Man's Future, was the most eloquent and comprehensive contribution) is more relevant in the 1980s than ever. ... In the spirit in which Harrison Brown wrote The Challenge of Man's Future some thirty years ago, this chapter has been written as a contribution to the continuing effort to help create that consensus. |
But a substantial fraction of humanity today is behaving as if it would like to create such a world. It is behaving as if it were engaged in a contest to test nature's willingness to support humanity and, if it had its way, it would not rest content until the earth is covered completely and to a considerable depth with a writhing mass of human beings, much as a dead cow is covered with a pulsating mass of maggots. |
And Canton! I long ago found that one cannot understand the word 'population' without having seen the East. I doubt if any single city in the Orient is a better example of this. The very ground seems to ooze people and the river water to breed them like flies. There are said to be half a million of this boat population alone, who live and die on the water and spend but little of their time ashore. At any hour of the day or night the streets are teeming with people, every foetid narrow alley crawls with them, every corner and wall cranny harbours them. ... If one stands for an instant on the pavement 3 or 4 ricksha's are clamouring for hire, shouting and pushing and beating each other down. Rushkin's description of mankind as a heap of maggots battening on each other for the means of substinance was never better illustrated than here.Brown was apparently referring to this obscure passage by the writer John Ruskin who described the population of 19th-century England as "a mere heap of agonizing human maggots, scrambling and sprawling over each other for any manner of rotten eatable thing they can get a bite of." It seems this image made such an impression on Harrison Brown that he returned to it repeatedly in his later writings.
And if population growth is to stop without our having excessively high death rates, we must reconcile ourselves to the fact that artificial means must be applied to limit birth rates. This conclusion is inescapable. We can avoid talking about it, moralists may try to convince us to the contrary, laws may be passed forbidding us to talk about it, fear of pressure groups may prevent political leaders from discussing the subject, but the conclusion cannot be denied on any rational basis. Either population-control measures must be both widely and wisely used, or we must reconcile ourselves to a world where starvation is everywhere, where life expectancy at birth is less than 30 years, where infants stand a better chance of dying than of living during the first year following birth, where women are little more than machines for breeding, pumping child after child into an inhospitable world, spending the greater part of their adult lives in a state of pregnancy. |
[These are examples of various references to and citations of The Challenge of Man's Future made by John Holdren in different books and papers he's published over the years. The top one mentions Challenge in Holdren's biography for his chapter in Earth and the Human Future; the second is a footnote referring to Challenge in a paper Holdren wrote in 1975 called Technology, Environment and Well-Being; and the last is a reference to Challenge in the 1985 book The Cassandra Conference, which Holdren edited.] |
Is there anything that can be done to prevent the long-range degeneration of human stock? Unfortunately, at the present time there is little, other than to prevent breeding in persons who present glaring deficiencies clearly dangerous to society and which are known to be of a hereditary nature. Thus we could sterilize or in other ways discourage the mating of the feeble-minded. We could go further and systematically attempt to prune from society, by prohibiting them from breeding, persons suffering from serious inheritable forms of physical defects, such as congenital deafness, dumbness, blindness, or absence of limbs. But all these steps would be negligible when compared with the ruthless pruning of man that was done by nature prior to the rise of civilization.
Unfortunately man's knowledge of human genetics is too meager at the present time to permit him to be a really successful pruner. The science of human genetics is not very old, and reliable facts and figures which enable one to differentiate satisfactorily between genetic effects and environmental effects are few and far between. Nevertheless, there is at present sufficient information to permit man to make a start toward pruning, however small it may be. And it is quite possible that by the time another ten or fifteen generations have passed, understanding of human genetics will be sufficient to permit man to do a respectable job of slowing down the deterioration of the species. This can be accomplished in two ways. First, man can discourage unfit persons from breeding. Second, he can encourage breeding by those persons who are judged fit on the basis of physical and mental testing and examinations of the records of their ancestors. A small start has been made in this direction in the cases of childless couples where the male is sterile and artificial insemination is utilized to impregnate the female. It is quite likely that artificial insemination will be used with increasing frequency during the coming decades, and increasing care will be taken to insure the genetic soundness of the sperm. If civilization survives, it is likely that in the long run we will be able to slow down and perhaps even to halt deterioration of the species. The methods that will be employed would probably not be palatable to many of us who are alive today. Nevertheless, the human animal is a flexible creature and has thus far been able to adjust his outlook to his needs with remarkable agility. |
Control of aids to conception and of abortions could also provide a mechanism for slowing down the deterioration processes associated with the elimination of biological competition. Priorities for artificial insemination could be given to healthy women of high intelligence whose ancestors possessed no dangerous genetic defects. Conversely, priorities for abortions could be given to less intelligent persons of biologically unsound stock.
Such steps would undoubtedly contribute substantially to a slowing down of species deterioration. But it is clear that they would by no means be sufficient. A broad eugenics program would have to be formulated which would aid in the establishment of policies that would encourage able and healthy persons to have several offspring and discourage the unfit from breeding at excessive rates. Here, of course, we encounter numerous difficulties—what would constitute "fit" and what would constitute "unfit'? Where is the boundary between the mentally deficient person and the genius? These are indeed grave problems, and the probability is high that they will never be solved. Yet the possibility cannot be excluded that solutions may be found. Our knowledge of human genetics, of human behavior, and of human biochemistry is fragmentary. Two or three generations of intensive research aimed at understanding the functioning of the human machine might well enable us to define terms such as "fit" and "unfit," as applied to human beings, with considerable precision. Although we realize that there is little likelihood that human beings will ever be able consciously to improve the species by carrying out a process of planned selection, there appears to be a finite possibility that, given adequate research and broad planning, deterioration of the species might eventually be halted. Precise control of population can never be made completely compatible with the concept of a free society; on the other hand, neither can the automobile, the machine gun, or the atomic bomb. Whenever several persons live together in a small area, rules of behavior are necessary. Just as we have rules designed to keep us from killing one another with our automobiles, so there must be rules that keep us from killing one another with our fluctuating breeding habits and with our lack of attention to the soundness of our individual genetic stock. On the other hand, although rules of behavior which operate in such areas are clearly necessary if our civilization is to survive, it remains to be seen whether or not such rules can be reconciled satisfactorily with the ideal of maximum individual freedom. |
In the past there has been considerable selection in favor of intelligence characteristics involving abilities to learn, to solve problems, and to transmit experience to offspring. In recent decades this pattern of selection has been completely reversed. Whereas in former times high intelligence increased the probability that many of an individual's characteristics would be reproduced and would spread throughout the population, today a high intelligence actually decreases this probability. The present situation has arisen as a result of the uneven adoption of birth-control techniques by differing social and economic groups in the Western World.
As modern contraceptive techniques have come into existence, they have first been used extensively by the wealthier and better- educated members of society. The techniques have been adopted only very gradually by the poorer and less-educated groups, with the result that these groups have been breeding much more rapidly than have the wealthier and better-educated ones. Although all of us have known intelligent people who are neither rich nor well educated, and we have known rather stupid people who are both rich and well educated, it is likely that on the average the more well-to-do and better-educated persons in our society have higher intelligence than the others. Although there are admittedly numerous individual fluctuations, it does appear that the feeble-minded, the morons, the dull and backward, and the lower-than-average persons in our society are outbreeding the superior ones at the present time. Indeed, it has been estimated that the average Intelligence Quotient of Western population as a whole is probably decreasing significantly with each succeeding generation. Fortunately there are indications that this trend may well be of a temporary nature. It is likely to be but a symptom of the transition period in which we are now living, where fertility control has been only partially accepted. Recent trends in the Western World, and particularly the recent developments in Sweden, indicate that within a few decades we may actually achieve a birth pattern according to which parents least able to provide for children will have small families; and as the ability to provide—both economically and intellectually—increases, family size will increase proportionately. Practically all of the recent changes in selection forces which we can imagine are of a negative nature. We can easily conceive of changes that may lead eventually to a lessened effectiveness of the human machine, but it is difficult to visualize forces that are leading to human betterment from the point of view of survival values. Nevertheless, a few slow changes which might or might not, in the long run, play important roles can be imagined. Traffic accidents tend to remove the reckless, the inattentive, and persons unable to judge time and distance at high speeds. Among children as well as adults, accidents of all types tend to remove from society persons who cannot obey instructions or heed warnings. General pressures of living tend to select in favor of persons who can adjust themselves to city and to factory life. Among the laboring groups, selection effects favor those who can work with groups and who can follow instructions meticulously. |
There are, of course, physical limitations of some sort which will determine the maximum number of human beings who can live on the earth's surface. But at the present time we are far from the ultimate limit of the number of persons who could be provided for. If we were willing to be crowded together closely enough, to eat foods which would bear little resemblance to the foods we eat today, and to be deprived of simple but satisfying luxuries such as fireplaces, gardens, and lawns, a world population of 50 billion persons would not be out of the question. And if we really put our minds to the problem we could construct floating islands where people might live and where algae farms could function, and perhaps 100 billion persons could be provided for. If we set strict limits to physical activities so that caloric requirements could be kept at very low levels, perhaps we could provide for 200 billion persons.
At this point the reader is probably saying to himself that he would have little desire to live in such a world, and he can rest assured that the author is thinking exactly the same thing. But a substantial fraction of humanity today is behaving as if it would like to create such a world. It is behaving as if it were engaged in a contest to test nature's willingness to support humanity and, if it had its way, it would not rest content until the earth is covered completely and to a considerable depth with a writhing mass of human beings, much as a dead cow is covered with a pulsating mass of maggots. |
These arguments have recently been expressed forcefully by Sir Charles Galton Darwin in his stimulating and highly provocative book entitled The Next Million Years.
Sir Charles's argument takes the following form: 1. Any nation which limits its population becomes less numerous than nations which do not limit their populations. The former will then sooner or later be crowded out of existence by the latter. 2. A nation which limits its population forfeits the selection effects of natural biological competition and as a result must gradually degenerate. 3. The tendency of civilization to sterilize its ablest citizens accelerates this process of degeneration. 4. The possibility that statesmen, perceiving these dangers, might agree upon a world-wide policy of limitation appears remote. How can they be expected to agree among themselves in this area when they have failed to solve the far easier problem of military disarmament? 5. Even if agreements among nations could be obtained, there would be great difficulty in establishing limits to the numbers admissible for the various populations. 6. The problem of enforcement of population-limitation agreements would be extremely difficult. 7. The probabilities of fanatical opposition to population limitation would be enormous. Although existing opposition is not, in the main, strongly emotional, it is likely that once population growth is forbidden by law, new creeds will emerge which will regard the practice as sinful. 8. The creedists, by multiplying more rapidly than the others, will make up an increasingly large fraction of the population, thus making enforcement increasingly difficult. 9. Natural selection will operate in favor of parental, as distinct from sexual, instincts. Those persons who want large families will in general have more children than others, and to the extent that this characteristic can be inherited, it would spread throughout the population. These are indeed powerful arguments and, when considered together, they make the possibility of ultimate population stabilization within a framework of low birth rates and low death rates appear so remote as to border on the impossible. Nevertheless, we must ask ourselves: Can we visualize ways and means whereby these difficulties might be minimized? In the first place, it is amply clear that population stabilization and a world composed of completely independent sovereign states are incompatible. Populations cannot be stabilized by agreement any more than levels of armament can be stabilized by agreement. And, as in the latter case, a world authority is needed which has the power of making, interpreting, and enforcing, within specified spheres, laws which are directly applicable to the individual. Indeed, population stabilization is one of the two major problems with which a world government must necessarily concern itself. Given a world authority with jurisdiction over population problems, the task of assessing maximum permissible population levels on a regional basis need not be prohibitively difficult. A rancher in Nevada usually puts no more cattle on a range than he believes can be adequately supported. Similarly, working on the basis that individual regions of the world should be self-sufficient both agriculturally and industrially, indices of potential productivity can be computed for all regions of the world, and maximum permissible population levels can be calculated on this basis. |
...These feeble-minded can be regarded objectively by their superiors, and so might be amenable to the same sort of control as is applicable to domestic animals. This restraint of the breeding of the feeble-minded is important, and must never be neglected.......and on page 124,
...With the knowledge of the various sexual hormones it might also become possible to free the majority of mankind from the urgency of sexual impulse, so that they could live contented celibate lives......etc. (This second quote is eerily reminiscent of the "put sterilants in the drinking water" proposal discussed by Holdren in Ecoscience, as pointed out in my earlier essay on the subject.)