Geography 3312A/B Lecture Notes - Population Momentum, Stellar Population, Salt Metathesis Reaction
1 Dec 2012
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Document Summary
We live in new times: sometime in october 2011 world population moved beyond 7 billion, on 23 may 2007 the global urban population, for the first time in human history, became. World population dramatically took off after 1800 . And even more noticeably after 1950, especially in developing countries. 10,000 years ago, when settled agriculture began, the world"s population was perhaps 5 million. 2000 years ago, during roman times, the population reached 250 million. By 1427, world population reached perhaps 427 million. From 1900 to 1950 the world"s population grew from 1. 6 to 2. 5 billion people. Now, it is more than 7 billion. Thus, over a century, the population has grown by a factor of four, which is historically unprecedented. Population growth is caused by birth rates (number of births per 1000 people in a given year) exceeding death rates (number of deaths per 1000 people in a given year) An intersection between those who die and those who live.
