Overpopulation has several impacts on earth. Environmental factors such as global warming, deforestation, extinction, and human factors like wars, starvation, intense competition for wages have a toll not only in the planet but on the way we live. The causes for overpopulation have different roots and seem to vary from culture to culture. Education plays a very important role, educated families where both spouses have some sort of degree tend to have less children, whereas uneducated families tend to be larger. This leads us to the second factor: poverty. In rural and poor areas of the world families tend to be bigger so all of their members can work and support each other, they are also numerous because disease tends to take the life of 1 or 2 kids per poor family in an underdeveloped country. Other more delicate factors such as religion (opposing the use of contraceptives and having the idea of following the word of God by having large families) also have a mild effect on the size of the population.