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Lect+16+Fall+2011 - Chapter3 TheChemistryof...

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10/1/2011 1 Chapter 3: The Chemistry of Global Warming (continued) Oct. 3/2011 Review from Last Lecture Greenhouse gas Anthropogenic Role of the atmosphere Greenhouse effect vs. enhanced greenhouse effect 2 Current concentration of CO 2 ? 1. 100 ppm 2. 300 ppm 3 390 3 3. 390 ppm 4. Huh? Why does CO 2 matter? 5. No clue… missed Friday’s class How can you go back in time? Ice core samples (places that have permanent snow cover contain preserved histories of the atmosphere, including GHGs) 4
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10/1/2011 2 CO 2 over the last millennium CO 2 over 400 millennia 6 Two Main Points Current atmospheric concentration of CO 2 is ______________than any time in the last million years (data not shown) For the past 400 thousand years, concentration of CO 2 has never risen as rapidly as it is rising today 7 What about Temperature? The past 120 years has seen the average temperature rise between 0.4 o C and 0.8 o C
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10/1/2011 3 The eight warmest years on record (since 1880) have occurred since 2001.
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