Before speculating on what might happen in the future, it is well to
recollect what has happened in the past. The earth has been inhabited for
thousands of years, and modern research has revealed the remains of many
ancient civilisations that have perished. For example, there were the great
nations of Cambodia and of Guatemala. In Crete, about 2000 B.C., there
existed a civilisation where women were dressed as are this evening the
women of London and Paris. That civilisation perished, and even its
language cannot now be deciphered. Why did these civilisations perish?
Surely this momentous question should take precedence over barren
discussions as to whether there will be sufficient food on the land or in
the sea for the inhabitants of the world in 200 years' time. How came it
about that these ancient nations did not double their numbers every fifty
years and fill up the earth long ago?
The answer is that they were overcome and annihilated by the incidence of
one or other of two dangers that threaten every civilisation, including our
own. These dangers are certain physical and moral catastrophes, against
which there is only one form of natural insurance, namely, a birth-rate
that adequately exceeds the death-rate. They help to illustrate further the
fallacy of the overpopulation scare.
The following is a general outline of these dangers, and in a later chapter
(p. 70)(see [Reference: Dangers]) I shall quote an example of how
they have operated in the past.