a) Why did the planet's population growth accelerate during the 20th century?
b) Why has the population growth rate grown slower in China?
c) Why do the population sizes of developed countries decrease?
d) What are the effects of population growth?
e) How can population growth be limited?
f) The average life expectancy varies between the populations of developing and developed nations. What differences are there in the causes of death between these kinds of nations?