geo coservation CHAPTER 9 PART 2

geo coservation CHAPTER 9 PART 2 - CHAPTER 9 PART 2 HUMAN...

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CHAPTER 9 PART 2
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HUMAN CLIMATE CHANGE May be most important environmental issue 1 st suggested in 1895 by Svante Arrhenius who predicted CO 2 would increase from burning coal Contemporaries
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CLIMATE CHANGE 1 st evidence from observatory in Hawaii built in 1957 Measurements showed CO 2 levels went from 315 ppm in 1958 to 383 ppm in 2006 Every May levels drop slightly as plant growth occurs but rises
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CLIMATE CHANGE 2001 climate report showed that recent changes in climate have had discernible 700 scientists from 100 countries reviewed 3000 studies and found 420 different systems were affected
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THE EVIDENCE Surface temp increased by .6⁰C over past cent w/ most in past 2 decades Greenhouse gases have increased CO 2 by 31% CH 4 by 151% N 2 O by 17%
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EVIDENCE (Cont). Greenhouse house gas emission from burning fossil fuels, making cement, burning forests & grasslands etc. Accounts for 30 billion tons of CO 2 , containing 8 billion in C 3billion absorbed by terrestrial systems 2 billion by ocean 3billion in
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EVIDENCE (Cont). CH 4 absorbs 20- 30x’s as much infrared and is accumulating twice as fast as CO 2 Released from ruminant animals, wet rice paddies, coal mines, landfills, pipeline leaks N 2 O is released by burning organic material and soil
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EVIDENCE (Cont). Permafrost is melting—ground sinking, damaging pipelines, homes, sewage pipes Increased temps led to beetle infestation killing 25 million spruce trees in Canada & Alaska Arctic sea ice is 40% thinner
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EVIDENCE (Cont). Antarctic ice shelves breaking up—90% of the glaciers are receding up to 50m/yr Alpine glaciers retreating—Mt Kilamanjaro lost 85% of ice cap since 1915, will be gone by 2015
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EVIDENCE (Cont). Venezuela once had 6 glaciers, now 2 Ocean is absorbing CO 2 storing heat which is slowing currents Stored heat will take centuries to dissipate Acidifying ocean affecting sealife
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EVIDENCE (Cont). Sea level has risen
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This note was uploaded on 04/17/2008 for the course BIOLOGY 104 taught by Professor Hucko during the Spring '08 term at Winona.

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geo coservation CHAPTER 9 PART 2 - CHAPTER 9 PART 2 HUMAN...

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