We can begin our discussion of "population as global issue" with what most persons mean when they discuss "the population problem": too many people on earth and a too rapid increase in the number added each year. The facts are not in dispute, It was quite right to employ the analogy that likened demographic growth to "a long, thin powder fuse that burns steadily and haltingly until it finally reaches the charge and explodes."
To understand the current situation. which is characterized by rapid increases in population, it is necessary to understand the history of population trends. Rapid growth is a comparatively recent phenomenon. Looking back at the 8,000 years of demographic history, we find that populations have been virtually stable or growing very slightly for most of human history. For most of our ancestors. life was hard. often nasty, and very short. There was high fertility in most places, but this was usually balanced by high mortali
A. warn people against the population explosion in the near future
B. compare the demographic growth pattern in the past with that after 1650
C. find out the cause for rapid increase in population in recent years
D. present us a clear and complete picture of the demographic growth