英文翻訳
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For thousands of years, the population of the world increased gradually.
Then, in the mid-nineteenth century, the world's population started to increase rapidly. In the 100 years between 1830 and 1930, the population of the world grew from 1 billion to 2 billion people. By 1960, just thirty years later, the world's population had hit 3 billion. Fifteen years later, the population reached 4 billion. Then, just eleven years later, there were 5 billion people on Earth. In 1999, we passed the 6 billion mark. Today, the world's population grows by 76 million people every year. By the year 2050, researchers predict that the population of the world will be 9.1 billion.
