It is estimated by experts on agriculture that one-third of anacre of land is needed to provide food for one person on acontinuing basis. It is also estimated that there are 10 billionacres of arable land on earth, and that therefore a maximumpopulation of 30 billion people can be sustained if no othersources of food are known. The total world population at thebeginning of 1970 was 3.6 billion. Assuming that the populationcontinues to increase at the rate of 2 percent per year, when willthe earth be full? What will be the population in the year2000?
