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Let the states of equilibrium and harmony exist in perfection and a happy order will prevail through heaven and earth and all things will be nourrished and flourish.
(MENCIUS, in The Doctrine of the Mean . ) In their natural environment the various plants and animals that have inhabited a region for ages have found a natural balance. The population of plants and animals of such a region appears to regulate itself auto- matically; the number of each species is kept within rather strict limits by a natural balance of forces. The introduction of a new element in such an equilibrated situation may result in a disaster when the balance of forces that acted as a perfect self-steering device up till the introduction of that new element, fails to keep the number of that element under control. A well known example for this type of (man’s) interference with nature’s balance of forces is the importation of rabbits in Australia. Because Australia’s fauna did not include any of the rabbit’s natural enemies a rabbit population explosion followed this unhappy decision. An equilibrated situation can become disturbed in a different way. An example of another type of (man’s) interference with nature’s balance of forces is the introduction of modern technology and medicine in up till recently backward countries. The ensuing raise in available food and the better hygienic standards removed the older checks on population increase such as famine and peri-natal death.
