Why there is standing room only on the tube ~ from official sources

Global Population Estimates: Year One through 2050 A.D.

Population in millions

Year	Lower Estimate	Upper Estimate
1 AD	170	400
200 AD	190	256
400 AD	190	206
500 AD	190	206
600 AD	200	206
700 AD	207	210
800 AD	220	224
900 AD	226	240
1000 AD	254	345
1100 AD	301	320
1200 AD	360	450
1300 AD	360	432
1400 AD	350	374
1500 AD	425	540
1600 AD	545	579
1700 AD	600	679
1800 AD	813	1,125
1850 AD	1,128	1,402
1900 AD	1,550	1,762
1910 AD	1,750     U N and U.S. Census Bureau, International Data*
1920 AD	1,860     increase from previous decade 110,000,000
1930 AD	2,070     increase from previous decade 210,000,000
1940 AD	2,300     increase from previous decade 230,000,000
1950 AD	2,557     increase from previous decade 257,000,000
1960 AD	3,042     increase from previous decade 485,000,000
1970 AD	3,712     increase from previous decade 670,000,000
1980 AD	4,453     increase from previous decade 741,000,000
1990 AD	5,291     increase from previous decade 838,000,000
2000 AD	6,094     increase from previous decade 804,000,000
2010 AD	6,868     increase from previous decade 774,000,000
2020 AD	7,656     increase from previous decade 788,000,000
2030 AD	8,321     increase from previous decade 665,000,000
2040 AD	8,874     increase from previous decade 553,000,000
2050 AD	9,306     increase from previous decade 432,000,000

* 1910 marks the beginning of more accurate population census counts: United Nations and U.S. Census Bureau, International Data Source from Historical Estimates:

• Biraben, Jean-Noel, 1980, An Essay Concerning Mankind’s Evolution, Population, Selected Papers, December, table 2.
• Durand, John D., 1974, “Historical Estimates of World Population: An Evaluation,” University of Pennsylvania, Population Center, Analytical and Technical Reports, Number 10, table 2.
• Haub, Carl, 1995, “How Many People Have Ever Lived on Earth?”, Population Today, February, p. 5.
• McEvedy, Colin and Richard Jones, 1978, “Atlas of World Population History,” Facts on File, New York, pp. 342-351.
• Thomlinson, Ralph, 1975, “Demographic Problems, Controversy Over Population Control,” Second Edition, Table 1.
• United Nations (UN), 1973, The Determinants and Consequences of Population Trends, Population Studies, No. 50., p.10.
• United Nations, 1999, The World at Six Billion, Table 1, “World Population From,” Year 0 to Stabilization, p. 5.
• U.S. Census Bureau (USCB), 2011, Total Midyear Population for the World: 1950-2050.

Birth Rate	Death Rate    Estimated 2011
• 19 births/1,000 population	• 8 deaths/1,000 population
• 131.4 million births per year	• 55.3 million people die each year
• 360,000 births per day	• 151,600 people die each day
• 15,000 births each hour	• 6,316 people die each hour
• 250 births each minute	• 105 people die each minute
• Four births each second of every day	• Nearly two people die each second

§  Average life expectancy at birth is approximately 67 years. Sources: Population Reference Bureau & The World Factbook (Central Intelligence Agency)