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Why is the population increasing? In 1999, the world population exceeded six billion. the rate of increase is about 80 to 85 million more people each year. Scientists predict that in 2050, there could be between 7.3 billion to 10.7 billion people in the world. Why is the population increasing so fast? Simply put, far more people are born each year than die. Better health care and nutrition have increased survival rates and longevity in many countries.