World Population Growth 2011 -7 billion 2000 After taking all of human history 6 billion ● s hillen for population to reach one billion, 1982 it took only a little over a century s billion s tillich to reach two billion in 1930 1975 The third billion was added in just 4: billion 4 tillian 30 years, the fourth in only 5 years.1960 3 billion 3 bilio 19303 2011.10.317 billion 2 billon 2 billie 800 Year ballon i hillis 100008C 250 million 5 million 0 700008C 5000BC Yea1000000Trends of World Population 2011.10. 31 7 billion 2011 --7 billion