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Chapter 9

2483: Ecology Chapter 9.pdf

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Biology 2483A
Hugh Henry

Chapter 9Population Growth and RegulationHuman Population Growth A Case Studypeople have a large effect on the global environment because our population has grown explosively and so has our energy and resources Human population reached 68 billion in 2010 more than double the number of people in 1960Our use of energy and resources has grown even more rapidly From 1860 to 1991 human population quadrupled in size and energy consumption increased 93foldFor thousands of years our population grew relatively slowly reaching 1 billion for the rst time in 1825 Now we are adding 1 billion people every 13 yearsGrowth rate has slowed recently to about 118 per year and continues to slowBy 2080 it is predicted there will be roughly 910 billion people on Earth
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