Bio 100 chapter 13 - human population Lecture

Study ecological earthquake damage in earthquake

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Unformatted text preview: ining is a way If, of figuring out if we are reaching Earth’s carrying capacity capacity The growth rate has slowed From high of 2.1% in 1960 to 1.2% now The UN has offered three projected tracks for future The growth to 2050 growth The slowing of the growth rate is not due to The density dependent factors, but rather due to birth rates falling faster than death rates birth The amount of resources: The The Net Primary Production (NPP) is the amount of The food energy available on the planet – measured by plant growth plant Estimates suggest that we are only using 1/3 of the Estimates total land NPP total Suggests that the carrying capacity is three times Suggests the current population (or 19 billion people) the Carrying capacity depends on more than just Carrying food food Also need water, air, and energy Must consider nonrenewable resources that Must nonrenewable can’t be easily replaced can’t Such as fossil fuels U.S. residents comprise 5% of Earth’s U.S. population, but use 24% of its energy population, U.S. residents consume 815 billion food U.S....
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This note was uploaded on 01/31/2014 for the course BIO 100 taught by Professor Robinson during the Fall '08 term at BYU.

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