Intro_Jan30

Intro_Jan30 - Environmental Geology Intro Fundamental...

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Environmental Geology - Intro Fundamental Concepts & Case Study
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Concept 1: Human Population Growth World population has grown exponentially through out time
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Growth in the United States Similar patterns can be seen in the US: US Population increase This rapid growth is some times referred to as Urban Sprawl Phoenix animation
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Human Population Growth World population has grown exponentially through out time N = N o e rt N = number of people N o = initial # of people r = rate of increase t = amount of time e = exponential function A.D. 2000 A.D. 1000 A.D. 1 1000 B.C. 2000 B.C. 3000 B.C. 4000 B.C. 5000 B.C. 6000 B.C. 7000 B.C. 1+ million years 8 7 6 5 2 1 4 3 Old Stone Age New Stone Age Bronze Age Iron Age Middle Ages Modern Age Black Death —The Plague 9 10 11 12 A.D. 3000 A.D. 4000 A.D. 5000 1800 1900 1950 1975 2000 2100 Future
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Exponential Growth Growth rate affected by Can be expressed as a percentage (G) or decimal (r) Varies historically and geographically Current global growth rate is 1.2% or ~ 0.012* US growth rate is 0.6% Western Africa is 2.7% Doubling Time (D) – amount of time required for the population to double if the growth rate is steady D = 70/G At our current growth rate, what is D – for the world? =58.3yrs – for the US? =116.6yrs – for West Africa? =25.9yrs * population data from 2007 World Population Data Sheet
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Concept 1: Human Population Growth As growth rate increases, doubling time decreases Hunter-Gatherer (40,000-9,000 BC): D 700,000 years Pre-industrial agriculture (9,000 BC - 1600): D ~ 2,300 years Early industrial (1600 - 1800 AD): D ~ 700 years Modern (1800 AD - now): D ~ 50 years Many reasonable projections predict world pollution over 9 billion
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Eighth Seventh Sixth Fifth Fourth Third Second First Billion Number of years to add each billion (year) All of Human History (1800) 130 (1930) 30 (1960) 15 (1975) 12 (1987) 12 (1999) 14 (2013) 14 (2027) 21 (2048) Sources: First and second billion: Population Reference Bureau. Third through ninth billion: United Nations, World Population Prospects: The 2004 Revision (medium scenario), 2005. World Population Growth, in Billions
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This note was uploaded on 04/17/2008 for the course GEO unk taught by Professor J.popo during the Spring '08 term at DePauw.

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Intro_Jan30 - Environmental Geology Intro Fundamental...

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