Currently, the population is increasing rapidly. The obvious example is the human population will be added phanpikwa. Count time as 1 billion people. In 1850, but during the past decade, less than 100 years, and has a population of 2 billion, an increase of about 30 per year, and much of the global population has increased by 3 billion people until the 1970s and tend to increase gradually.
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