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There are currently about 7 billion people in the worldâ¦and that number continues to rise. Overpopulation can be caused by a number of factors, including an increase in births, a decline in mortality rates, an increase in immigration, and/or an unsustainable habitat (in this case Earth) and depletion of resources.irst, the initial calculation was done by Thomas Sowell in 1984, when the world's population was 4.4 billion. Its now 7 billion and growing. It's irrelevant to discussions of overpopulation, because it does nothing to address resources or the distribution of them.
In the wilderness, the problem of overpopulation of species is often solved by growth in the population of predators. Predators tend to look for signs of weakness in their prey, and therefore usually first eat the old or sick animals.n 2013 the human population was 7 billion. By 2025 the world population is expected to grow by an additional 1 billion. Depending on which estimate of overpopulation is used, human overpopulation may or may not have already occurred.