3. Increased Life Expectancy
The average annual birth rate in India was 42/1000 population in 1950-60, now it has decreased to 26/1000 population in 2010. But, on the other hand, the death rate of 43/1000 at the start of the 20th century has now become just an 8/1000 population. Therefore, in the past 100 years, the population has skyrocketed.
Rise in poverty
Poverty is one of the major factors for overpopulation but it also works the other way around. Overpopulation leads to even more poverty as poor people with large families find it hard to provide even the basic necessities to their family members.
Uneven wealth distribution
Overpopulation leads to an unequal distribution of wealth and income. Consequently, the gap between the rich and the poor is widened further. 1% of society has the most control over all social and economic factors. A class struggle thus continues further.
Humans always tend to migrate once overpopulation starts eroding the available resources and opportunities. This, in turn, leads to more people entering a more prosperous geographical region. The native population now has to fight for the limited resources, with a surplus of the population at hand. Wars, famines, economic breakdowns, religious persecutions, military coups, etc. all have been known to contribute towards mass migrations across international borders.
The burden on natural resources
Overpopulation puts a burden on basic natural resources and this leads to the exploitation of natural resources. After tipping is reached, it is the poor who have to suffer starvation and unhealthy living conditions. Overpopulation also leads to excessive deforestation which wreaks havoc in nature.