A View from the Back of the Envelope top

How many people
Scale of some things
People seconds
Landmarks
[ Scale | Landmarks | Other ]

Some Data...

Homo Sapiens existance: 106 years (1013 s)
Modern human spread: 105 x ~0.4 years ago
World human pop c10,000 YA: 107

Human Population Estimates [Cow, p263]
yearworld pop (×109)US pop (×109)
16500.5
18501.10.023
19001.60.076
19101.70.092
19302.00.123
19502.50.152
19603.00.181
19703.60.205
19804.50.227
19834.70.234


"All data about past populations are suspect. Unflawed census records are rare, and any other assessment is, at best, informed guesswork."[Timescale, p267]

And these two tables should be taken with an extra-large dose of salt, as Timescape (1983) is getting rather old. I include them so you can do rough (say factor of 2) calculation.

Population Estimates - 2000 YR to present (millions) [Timescale, p267]
yr before AD 20002000100050025010030
AD110001500175019001970
World29532551577016803650
China8065125207425800
India7575112180180627
southwestern Asia3525253042110
Japan15172944103
rest of Asia14172245217422
USSR area7101435132243
Europe353565127297422
northern Africa1279125472
rest of Africa22304565105280
North America122282228
rest of America1050601574287
Oceania1112619

Population: Summary Timetable [Timescale, p269]
population growing: c. 9500 yr. From ?8 million to peak, [...]
level or falling populations: c. 2000 yr. In the Old World, associated with the increase in disease, and poorly defined crashes, esp. after 1838 yr (AD 162, Eurasian epidemics); populations were still rising in the Americas.
population surge: c. 1000 yr (AD 1000). In China and Europe.
population crash: c. 790 yr (AD 1290). Dated by Chinese census, probably typical of Eurasia.
population recovery: c. 650 yr (AD 1450). Dated for the estimate for China, again perhaps typical of Eurasia.
Amerindian epidemics (population crash): 479 yr (AD 1521). A direct consequence of the breakout of the European navigators and their diseases. [...?]
population boom: c. 300 yr (AD 1700). First in China (interrupted 1850, resumed 1950); in Europe from c. AD 1800.
global population boom: c. AD 1930
population inflection: c. AD 1970. The rate of growth abating in the world as a whole (c. 1900 in Europe).

2%/yr turnover

A View from the Back of the Envelope
Comments encouraged. - Mitchell N Charity <mcharity@lcs.mit.edu>