Answer:
According to researchers, several factors have led to an increase in the human population since the last 200 years.
The main reason for the growth in the human population is the decrease in the rate of deaths as compared to the rate of births. With the developments in science and particularly health sciences, the death rate by infections or diseases has been reduced to minimal. Even efforts are being made to increase the life span of a human being by scientists.
On the other hands, the birth rates are increasing day by day. The population is increasing mainly in third world countries where people do not take care of birth controls.
