8- Population Growth Post

8- Population Growth Post - PopulationGrowth...

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Population Growth Biology 1305
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Human population growth:  7  billion Populations continue to rise in most countries Particularly in poverty-stricken developing nations Although the rate of growth is slowing, we are still  increasing in absolute numbers It would take 30 years, counting once each second, to  count to a billion!
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The human population is still  growing rapidly It took all of human history to reach 1 billion In 1930, 130 years later, we reached 2  billion, and added the most recent billion in  12 years Due to exponential growth, even if the growth rate remains  steady, population will continue to grow
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Rates of growth vary from region to region At today’s 1.2% global growth rate, the  population will double in 58 years
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Is population growth really a problem? Population growth results from  technology, sanitation, food Death rates drop, but not birth rates Some people say growth is no problem New resources will replace depleted ones Quality of life will suffer with unchecked  growth Less food, space, wealth per person
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Causes and consequences of  population growth
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Some fear falling populations Population growth is correlated with  poverty, not wealth Policymakers believe growth increases  economic, political, military strength They offer incentives for more children 67% of European nations think their birth  rates are too low In non-European nations, 49% feel their birth  rates are too high
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Population growth affects the environment The IPAT model:   I  =  P  x  A  x  T  x  S Our total  impact  (I) on the environment results from the  interaction of population (P), affluence (A) and  technology (T), with an added sensitivity (S) factor Population  = individuals need space and resources Affluence  = greater per capita resource use Technology  = increased exploitation of resources Sensitivity  = how sensitive an area is to human pressure Further model refinements include education, laws,  ethics Humanity uses 1/3 of all the Earth’s net primary production
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Computer simulations predict the future Simulations project trends 
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8- Population Growth Post - PopulationGrowth...

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