Global Warming

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CONSEQUENCES OF GLOBAL WARMING

Transcript of Global Warming

  • 1.GLOBAL WARMING A WARNING FOR LIFE

2.

  • * It is simply defined as the increase in the earths atmosphere by green house gases.

WHAT IS GLOBAL WARMING? 3. 4.

  • Carbon dioxide
  • Nitrogen oxide
  • CFCs(Chloro fluro Carbons
  • Hydro carbons
  • Methane
  • Water vapour

Greenhouse Gasses 5.

  • Causes of global warming: .
  • Deforestation
  • Rapid industrialization
  • Population explosion
  • Increase in GHG concentration
  • Main cause: CARBON DIOXIDE

6.

  • Earths cooling system is clogged
  • Net effect:
  • E A R T HH E A T S
  • UP

Increased GHG Concentration 7.

  • CO 26-10 times present
  • Temps ~ 14 o C warmer than present
  • Could this be an analog for the future?

Cretaceous a hot-house world 85 Ma 8. Atmospheric CO 2(parts per million) 9. 800 600 400 200 0 CO 2(ppmv) Thousands of Years Before Present 240 300 270 210 180 Petit et al., 1999; Siegenthaler et al., 2005; EPICA Community members, 2004 Temp. Proxy Present CO 2concentration (386 ppmv) CO 2concentration after 50 years of unrestricted fossil fuel burning (600 ppmv) 10. 270 290 360 370 380 Carbon Dioxide Concentration (ppmv) 280 300 310 320 330 340 350 1750 1800 1850 1900 1950 2000 Mauna Loa (1958 - present) Siple Station (1750 - ) Reconstructed CO 2concentrations 11. Climate fluctuates naturally Glacier ice Sea ice 18,000 years ago Present 12. Global mean temperature Global average sea level Northern hemisphere snow cover Observations of recent climate change 13. Global Instrumental Temperature Record 10 warmest years 14. 15. 16.

  • For over 30 years, scientists have predicted increased greenhouse gasses will causeunnaturalchanges
  • By 2000:
      • Antarctic sea ice and ice shelf break-ups
      • Antarctic Peninsula warming
      • Arctic sea ice melting
      • Faster Arctic warming ( 11F)
      • Melting of small glaciers and ice caps
      • Sea level rise
      • And more

Predicted changes of human-caused warming 17. Larsen B, Mar-02 Antarctic Sea Ice Break-ups 18. Larsen B, Mar-02 19. Larsen B, Mar-02 20. Wilkins, Mar-08 21. 22. 23. Arctic Sea Ice Melting 1979 24. Arctic Sea Ice Melting 2005 25. Arctic Sea Ice Melting 2007 26. Ice Extent(10 6km 2 ) Arctic sea ice extent 2007 27. Arctic is warming faster 1860 1880 -2.0 Difference (C) from 1961-1990 mean All land area 1900 1920 1940 1960 1980 2000 -1.0 0.0 1.0 2.0 Arctic (land north of 65N) 28. Carroll Glacier 1906 2004 1980 29. McCarty Glacier, Alaska 30. Muir and Riggs Glaciers 31. Kilimanjaro 1970 2005 32. 1993 2000 33. Qori Kalis 1978 2002 1928 2004 Patagonia 34.

  • Glaciers and ice caps gone by 2100
  • Ice sheets melting too!
  • Over 40% of worlds water supply
  • Direct rise in sea level
  • Reflect sunlight

Who cares? 35. 36. Sea-level rise

  • Temperatures and sea levels will continue to rise for centuries. Arctic sea ice will disappear in the next few decades Hot extremes, heat waves, and heavy rains will continue to become more frequent

Global warming facts (IPCC, 2007): 37. Sea-level rise

  • Thermal expansion
  • Addition of water
  • Freshening of water
  • Melting ice sheets
    • Greenland: 7.4 m (25) potential
    • Antarctica: 74 m (250) potential
      • West Antarctica (7 m)
      • East Antarctica (67 m)

38. West Antarctic Ice Sheet 39. Greenland satellite melt record 1992 2005 40. 1980 0.5 0.8 Melt Extent (10 6km 2 ) 0.6 0.7 1985 1990 1995 2000 2005 0.4 0.2 0.3 Greenland Melt Extent (April - September 25) 1992 2002 2005 41. 17-Jun-2003 13-Jun-2002 14-Jun-2001 42. Sea-level rise 43. Coastal population Coastal migration 44. Sea level 18,000 years ago (-70m) Floridas coast if Greenland OR the West Antarctic Ice Sheet Melted 7m rise in sea level 5m rise in sea level 8m rise in sea level 45.

  • Fastest extinction rate in 65 M years (1000x normal rate)
  • Increased poverty and hunger
  • Increased disease
    • Air-borne (e.g. asthma)
    • Insect-borne (e.g. malaria)
  • More extreme weather
    • Droughts
    • Flooding
    • Heat-waves
    • Storms

Additional consequences 46. Habitat loss Mass extinction 47. Coral bleaching GREAT LOSS TO AQUATIC LIFE CHANGE IN LIFE FORMS 48. Methane hydrates Melting of Methane Hydrate crystals could lead to run-away greenhouse 49. Projected risks due to climate change 50. What canyoudo? 51. Reduce consumption 52. Plant trees 53. Drive less 54. Shop smart 55. Alternative energy 56. Be informed 57. Unplug 58. Improve efficiency 59. Dont buy ocean-front property 60. 61.