lecture 4 - 2 Population(Ch7 Introduction Questions Why is...

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2. Population (Ch7) Introduction - October 1999 – world population = 6 billion - Currently, ~ 83 million births each year of which only 1 million(1.2%) occur in advanced, industrialized nations - Demography - study of population - Population geography - study of the spatial components of demography ( distribution, density, migration) Questions: - Why is population a global issue? o Is too many people bad for the world - How has population changed over the 6 million year history of humanity? o There were more births within the last 1000 years - How many people can the earth support? History of Population growth - 2000 years BP- 250 million - 1650 AD- 500 million - 1804 AD- 1 billion - 1927 AD- 2 billion - 1974 AD- 4 billion - 1999 AD- 6 billion - 2006 AD- 6.7 billion - Est. 2030 AD- 8.3 billion - Est. 2050 AD- 9.4 billion - Note: in 1970s, predictions for 2050 was approx. 12 billion; current predictions was changed to 9.4 billion Two observations:
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1) Significant increases associated with: o First agricultural revolution (9000 years ago) o Indrustrial revolution (18 th century) o Green revolution 2) From the ‘beginning’ (6mya) to 1927, pop. Reaches 2 million; from 1927, <50 years to
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