Global Warming Consequences 1

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Global Warming Consequences 1

  1. 1. 2
  2. 2. `T h e r e is n e w a n d s t r o n g e r e v id e n c e th a t m o s t o f th e w a r m in g o b s e r v e d o ve r t h e la s t 5 0 y e a r s is a t t r ib u t a b le t o h u m a n a c t iv it y ' Intergovernmental Panel on Climate Change (United Nations), Third Assessment Report, 2001
  3. 3. o b s e r v e d in c r e a s e in g lo b a lly a v e r a g e d t e m p e r a t u r e s s in c e t h e m id -2 0 th c e n tu ry is ve ry like ly d u e t o th e o b s e rv e d in c r e a s e in a n t h r o p o g e n ic g re e n h o u s e g a s Intergovernmental e n t r Climate Change.(United c o n c Panel on a t io n s ' Nations), Fourth Assessment Report, 2007
  4. 4. c lim a t e s y s t e m is u n e q u iv o c a l , a s is n o w e v id e n t f r o m o b s e r v a t io n s o f in c r e a s e s in g lo b a l a v e r a g e a ir a n d o c e a n te m p e ra tu re s , w id e s p r e a d m e lt in g o f s n o w a n d ic e , a n d r is in g g lo b a l m e a n Intergovernmentale a le Climate ' s Panel on v e l . Change (United Nations), Fourth Assessment Report, 2007
  5. 5. Greenhouse Gases • Let sunlight in – short wavelengths • Earth heats up and radiates heat – longer wavelengths • GHGs – don’t let Earth’s heat out
  6. 6. Increased Greenhouse Gases Earth’s “cooling” system is “clogged” • Net effect: – Earth warms to a temperature where its radiation is shorter wave- lengths and can escape
  7. 7. Evidence f romthe Earth
  8. 8. Observations of recent climate change Global mean temperature Global average sea level Northern hemisphere snow cover 9
  9. 9. Global Instrumental Temperature Record 10 warmest years 10
  10. 10. 390 2007 380 Carbon Dioxide Concentration (ppmv) 370 360 350 340 330 320 310 1960 1970 1980 1990 2000
  11. 11. Signs that global warming is underway • Sea level rise • by thermal expansion AND ice melt • Sea ice melting (Arctic and Antarctic) • Glaciers melting worldwide • Arctic and Antarctic Peninsula heating up fastest • Melting on ice sheets is accelerating • More severe weather (droughts, floods, storms, heat waves, hard freezes, etc.) • Bottom line: • These changes do not fit the natural patterns unless we add the effects of increased GHGs
  12. 12. Some climate change facts • Globe 1°F warmer than 100 yrs ago • Last glacial max. was only 5°F cooler • Not equally distributed – Some areas have warmed 11°F – Winter and night increasing fastest (~5 times faster) • Weather becoming more variable and more severe
  13. 13. Arctic Sea Ice Melting 14
  14. 14. Arctic sea ice extent 0.4 Ice Extent Anomaly (106 km2) 0.2 0.0 -0.2 -0.4 -0.6 -0.8 15 1980 1985 1990 1995 2000 2005
  15. 15. Melting of small glaciers and ice caps 2004 1941 16
  16. 16. McCarty Glacier, Alaska 17
  17. 17. Kilimanjaro 18
  18. 18. Kilimanjaro 1970 2005 19
  19. 19. Patagonia 1928 2004 20
  20. 20. Sea-level rise
  21. 21. Sea-level rise
  22. 22. Additional consequences • Fastest extinction rate in 65 M years (1000x normal rate) • Increased disease (e.g. asthma, malaria) • Increased poverty and hunger • Sea level rise • More extreme weather – Droughts – Flooding – Heat-waves – Storms
  23. 23. Coral bleaching 24
  24. 24. Mass extinction 25
  25. 25. Habitat loss 26
  26. 26. Palmer Drought Severity Index 1900-2002 27
  27. 27. What can you do?
  28. 28. Reduce consumption
  29. 29. Plant trees
  30. 30. Drive less
  31. 31. Shop smart
  32. 32. Alternative energy
  33. 33. Be informed
  34. 34. Unplug
  35. 35. Improve insulation
  36. 36. Don’t remain happy in ignorance

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