Global Warming Consequences 1

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2. `T h e r e is n e w a n ds t r o n g e r e v id e n c eth a t m o s t o f th ew a r m in g o b s e r v e do ve r t h e la s t 5 0 y e a r s isa 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. 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 dt 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 icg 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. c lim a t e s y s t e m isu 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 do 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 fs n o w a n d ic e , a n dr 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. Greenhouse Gases Let sunlight in short wavelengths Earth heats up and radiates heat longer wavelengths GHGs dont let Earths heat out 6. Increased Greenhouse Gases Earths cooling system is clogged Net effect: Earth warms to a temperature where its radiation is shorter wave- lengths and can escape 7. Evidence f romthe Earth 8. Observations of recent climate changeGlobal meantemperatureGlobal averagesea level Northern hemisphere snow cover 9 9. Global Instrumental Temperature Record 10 warmest years10 10. 390 2007 380 Carbon Dioxide Concentration (ppmv) 370360 350340 330 320 310 1960 1970 1980 1990 2000 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 weadd the effects of increased GHGs 12. Some climate change facts Globe 1F warmer than 100 yrs ago Last glacial max. was only 5F cooler Not equally distributed Some areas have warmed 11F Winter and night increasing fastest (~5 times faster) Weather becoming more variable and more severe 13. Arctic Sea Ice Melting14 14. Arctic sea ice extent0.4 Ice Extent Anomaly (106 km2)0.2 0.0 -0.2 -0.4 -0.6 -0.815 1980 1985 1990 1995 2000 2005 15. Melting of small glaciers and ice caps 2004 194116 16. McCarty Glacier, Alaska 17 17. Kilimanjaro 18 18. Kilimanjaro 1970 200519 19. Patagonia 1928 200420 20. Sea-level rise 21. Sea-level rise 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. Coral bleaching 24 24. Mass extinction 25 25. Habitat loss26 26. Palmer Drought Severity Index 1900-200227 27. What can you do? 28. Reduce consumption 29. Plant trees 30. Drive less 31. Shop smart 32. Alternative energy 33. Be informed 34. Unplug 35. Improve insulation 36. Dont remain happy in ignorance