ABSTRACT
In round numbers the total population of the world was 2 5 billions in 1950, 30 in 1960, 3 6 in 1970, and may reach 6 4 (or more) by the year 2000.1 Between 1950 and 1975 there was an increase of some 60 per cent, and currently the annual rate of increase is nearly 2 per cent, an increase of about 80 millions a year.
