a tremendous change occurred with the industrial revolution: whereas it had taken all of human history up to the year 1800 for world population to reach 1 billion, the second billion was achieved in only 130 years (1930), the third billion in 30 years (1960), the fourth billion in 15 years (1974), the fifth billion in 13 years (1987), the sixth billion in 11 years (1998), the seventh billion and eighth billion in 12 years each (20).growth rate is currently declining and is projected to continue to decline in the coming years (reaching below 0.50% by 2048, reach 0 in 2086, and decline by -0.11% in 2100).
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