A crowded world. Trends in Human Population Growth. GROWTH in the World\'s Population. 1830 the world\'s population reached ONE BILLION 1930, just 100 years later the population reached 2 billion. 1960 (30 years later) it reached 3 billion 15 more years later in 1975, it climbed to 4 billion.12 years later in 1987, it crossed the 5 billion mark. 12 years later in 1999 the world\'s reached 6 billion By 2029, the world\'s population is estimated to be 10.4 billion.
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