Some negative effects of population growth are insecurity, crime, unemployment, underdevelopment, inequitable sharing of resources, and increased pollution of the environment. These negative effects lead to subsequent problems such as clashes and fighting for dwindling resources, poor sanitation, and drug abuse.
Overpopulation is the existence of more people than the available resources can support. Most countries in the developing world are faced with the problem of uncontrolled population growth. If not checked, the growth could lead to depletion of resources, and a lack of cultivatable land, leading to starvation. Overpopulation is also referred to as proliferation of population or population explosion.