Humans and Ecology:

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Humans and Ecology What are we doing, what
should we do, what can we do, and does it matter?
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Fig 55.6
Why are species going extinct?
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The complex molecules that comprise organisms are
based on carbon
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Fig 54.14
Carbon cycle
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Solar energy incoming and outgoing
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CO2 and other greenhouse gases keep heat from
radiating back into space
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CO2 levels in Hawaii and average global temp.
Fig54.15
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Gases trapped in ice core bubbles can tell us
about past climate conditions.
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Recent increases in global temperature have
reversed a slight cooling trend
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Vikings in Greenland in the 1200-1400s
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As the climate cooled, the Vikings were forced to
abandon their outposts
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370
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Relative contributions to Global Warming
500 m people
300 m people
2.5 b people
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Effects of global warming are already visible
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iers.html
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Observed and projected ice cap melting
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Global Change Human Health (2001) V 2 1 pg 64
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Precipitation changes 1900 to 2000
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Humans and Ecology What are we doing, what
should we do, what can we do, and does it matter?