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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.
Overpopulation. It is a word that makes politicians wince, and is often described as the elephant in the room in discussions about the future of the planet. You often hear people citing overpopulation as the single biggest threat to the Earth. But can we really single out population growth in this way? Are there really too many people on our planet? It is clear to all of us that the planet is not expanding. There is only so much space on Earth, not to mention only so many resources â food, water and energy â that can support a human population. So a growing human population must pose some kind of a threat to the wellbeing of planet Earth, mustn't it? Not necessarily.