In the light of what we have recently learned about animal behavior in general, and human behavior in particular, it has become clear that control through the punishment of undesirable behavior is less effective, in the long run, than control through the reinforcement of desirable behavior by rewards, and that government through terror works on the whole less well than government through the non-violent manipulation of the environment and of the thoughts and feelings of individual men, women and children. Punishment temporarily puts a stop to undesirable behavior, but does not permanently reduce the victim's tendency to indulge in it. Moreover, the psycho-physical by-products of punishment may be just as undesirable as the behavior for which an individual has been punished. Psychotherapy is largely concerned with the debilitating or anti-social consequences of past punishments.
On the first Christmas Day the population of our planet was about two hundred and fifty millions -- less than half the population of modern China. Sixteen centuries later, when the Pilgrim Fathers landed at Plymouth Rock, human numbers had climbed to a little more than five hundred millions. By the time of the signing of the Declaration of Independence, world population had passed the seven hundred million mark. In 1931, when I was writing Brave New World, it stood at just under two billions. Today, only twenty-seven years later, there are two billion eight hundred million of us. And tomorrow -- what? Penicillin, DDT and clean water are cheap commodities, whose effects on public health are out of all proportion to their cost. Even the poorest government is rich enough to provide its subjects with a substantial measure of death control. Birth control is a very different matter. Death control is something which can be provided for a whole people by a few technicians working in the pay of a benevolent government. Birth control depends on the co-operation of an entire people. It must be practiced by countless individuals, from whom it demands more intelligence and will power than most of the world's teeming illiterates possess, and (where chemical or mechanical methods of contraception are used) an expenditure of more money than most of these millions can now afford. Moreover, there are nowhere any religious traditions in favor of unrestricted death, whereas religious and social traditions in favor of unrestricted reproduction are widespread. For all these reasons, death control is achieved very easily, birth control is achieved with great difficulty. Death rates have therefore fallen in recent years with startling suddenness. But birth rates have either remained at their old high level or, if they have fallen, have fallen very little and at a very slow rate. In consequence, human numbers are now increasing more rapidly than at any time in the history of the species.
Moreover, the yearly increases are themselves increasing. They increase regularly, according to the rules of compound interest; and they also increase irregularly with every application, by a technologically backward society of the principles of Public Health. At the present time the annual increase in world population runs to about forty-three millions. This means that every four years mankind adds to its numbers the equivalent of the present population of the United States, every eight and a half years the equivalent of the present population of India. At the rate of increase prevailing between the birth of Christ and the death of Queen Elizabeth I, it took sixteen centuries for the population of the earth to double. At the present rate it will double in less than half a century. And this fantastically rapid doubling of our numbers will be taking place on a planet whose most desirable and productive areas are already densely populated, whose soils are being eroded by the frantic efforts of bad farmers to raise more food, and whose easily available mineral capital is being squandered with the reckless extravagance of a drunken sailor getting rid of his accumulated pay.
As large and increasing numbers press more heavily upon available resources, the economic position of the society undergoing this ordeal becomes ever more precarious. This is especially true of those underdeveloped regions, where a sudden lowering of the death rate by means of DDT, penicillin and clean water has not been accompanied by a corresponding fall in the birth rate. In parts of Asia and in most of Central and South America populations are increasing so fast that they will double themselves in little more than twenty years. If the production of food and manufactured articles, of houses, schools and teachers, could be increased at a greater rate than human numbers, it would be possible to improve the wretched lot of those who live in these underdeveloped and over-populated countries. But unfortunately these countries lack not merely agricultural machinery and an industrial plant capable of turning out this machinery, but also the capital required to create such a plant. Capital is what is left over after the primary needs of a population have been satisfied. But the primary needs of most of the people in underdeveloped countries are never fully satisfied. At the end of each year almost nothing is left over, and there is therefore almost no capital available for creating the industrial and agricultural plant, by means of which the people's needs might be satisfied. Moreover, there is, in all these underdeveloped countries, a serious shortage of the trained manpower without which a modern industrial and agricultural plant cannot be operated. The present educational facilities are inadequate; so are the resources, financial and cultural, for improving the existing facilities as fast as the situation demands. Meanwhile the population of some of these underdeveloped countries is increasing at the rate of 3 per cent per annum.
Whenever the economic life of a nation becomes precarious, the central government is forced to assume additional responsibilities for the general welfare. It must work out elaborate plans for dealing with a critical situation; it must impose ever greater restrictions upon the activities of its subjects; and if, as is very likely, worsening economic conditions result in political unrest, or open rebellion, the central government must intervene to preserve public order and its own authority. More and more power is thus concentrated in the hands of the executives and their bureaucratic managers. But the nature of power is such that even those who have not sought it, but have had it forced upon them, tend to acquire a taste for more. "Lead us not into temptation," we pray -- and with good reason; for when human beings are tempted too enticingly or too long, they generally yield. A democratic constitution is a device for preventing the local rulers from yielding to those particularly dangerous temptations that arise when too much power is concentrated in too few hands. Such a constitution works pretty well where, as in Britain or the United States, there is a traditional respect for constitutional procedures. Where the republican or limited monarchical tradition is weak, the best of constitutions will not prevent ambitious politicians from succumbing with glee and gusto to the temptations of power. And in any country where numbers have begun to press heavily upon available resources, these temptations cannot fail to arise. Over-population leads to economic insecurity and social unrest. Unrest and insecurity lead to more control by central governments and an increase of their power. In the absence of a constitutional tradition, this increased power will probably be exercised in a dictatorial fashion. Even if Communism had never been invented, this would be likely to happen. But Communism has been invented. Given this fact, the probability of over-population leading through unrest to dictatorship becomes a virtual certainty. It is a pretty safe bet that, twenty years from now, all the world's over-populated and underdeveloped countries will be under some form of totalitarian rule -- probably by the Communist party.
How will this development affect the over-populated, but highly industrialized and still democratic countries of Europe? If the newly formed dictatorships were hostile to them, and if the normal flow of raw materials from the underdeveloped countries were deliberately interrupted, the nations of the West would find themselves in a very bad way indeed. Their industrial system would break down, and the highly developed technology, which up till now has permitted them to sustain a population much greater than that which could be supported by locally available resources, would no longer protect them against the consequences of having too many people in too small a territory. If this should happen, the enormous powers forced by unfavorable conditions upon central governments may come to be used in the spirit of totalitarian dictatorship.
The United States is not at present an over-populated country. If, however, the population continues to increase at the present rate (which is higher than that of India's increase, though happily a good deal lower than the rate now current in Mexico or Guatemala), the problem of numbers in relation to available resources might well become troublesome by the beginning of the twenty-first century. For the moment overpopulation is not a direct threat to the personal freedom of Americans. It remains, however, an indirect threat, a menace at one remove. If over-population should drive the underdeveloped countries into totalitarianism, and if these new dictatorships should ally themselves with Russia, then the military position of the United States would become less secure and the preparations for defense and retaliation would have to be intensified. But liberty, as we all know, cannot flourish in a country that is permanently on a war footing, or even a near-war footing. Permanent crisis justifies permanent control of everybody and everything by the agencies of the central government. And permanent crisis is what we have to expect in a world in which over-population is producing a state of things, in which dictatorship under Communist auspices becomes almost inevitable.
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