Global warming

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This ppt is presented by Mr. VINAY KUMAR SHAH (10BEC0347) of VIT University, Vellore (TN) in his very first year of B.Tech ECE under the course Environmental studies.

This ppt is presented by Mr. VINAY KUMAR SHAH (10BEC0347) of VIT University, Vellore (TN) in his very first year of B.Tech ECE under the course Environmental studies.

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  • Decades ago, climate scientists told of the predicted patterns of UNNATURAL climate change caused by increasing greenhouse gas concentrations. They nailed the patterns. What they predicted is exactly what we are seeing.
  • Images of Kilimanjaro taken from the shuttle in 1993 and in 2000.
  • As glaciers melt in a warmer climate, sea levels rise.
  • Here’s what FL’s coast looked like.
  • Species of land animals are disappearing faster now than any time since the dinosaurs were wiped out 65 million years ago. From polar bears in the Arctic no longer having sea ice for hunting, mating, and migration, to frog in the tropics, we are losing species fast, and humans are almost completely to blame. Increased winds are carrying dust farther, worsening conditions like allergies and asthma, while longer breeding seasons for insects are helping spread insect-borne disease like malaria.

Transcript

  • 1. *It is simplydefined as theincrease in thetempreture ofearth’satmosphere bygreen housegases
  • 2. Causes of global warming: . Deforestation Rapid industrialization Population explosion Increase in GHG concentration Main cause: CARBON DIOXIDE
  • 3. Greenhouse Gasses Carbon dioxide Nitrogen oxide CFCs(Chloro fluro Carbons Hydro carbons Methane Water vapour
  • 4. Atmospheric CO2 (parts per million)
  • 5. Climate fluctuates naturally18,000 years ago Present Glacier ice Sea ice
  • 6. Predicted changes of human-caused warming For over 30 years, scientists have predicted increased greenhouse gasses will cause unnatural changes By 2000: T Antarctic sea ice and ice shelf break-ups T Antarctic Peninsula warming T Arctic sea ice melting T Faster Arctic warming (11°F) T Melting of small glaciers and ice caps T Sea level rise T And more…
  • 7. Antarctic Sea Ice Break-upsLarsen B, Mar-02 14
  • 8. Larsen B, Mar-02 15
  • 9. Larsen B, Mar-02 16
  • 10. Wilkins, Mar-08
  • 11. Arctic Sea Ice Melting1979
  • 12. Arctic Sea Ice Melting2005
  • 13. Arctic Sea Ice Melting2007
  • 14. Ice Extent (106 km2) Arctic sea ice extent 2007
  • 15. Arctic is warming faster 2.0 All land areaDifference (°C) from 1961-1990 mean Arctic (land north of 65°N) 1.0 0.0 -1.0 -2.0 24 1860 1880 1900 1920 1940 1960 1980 2000
  • 16. Carroll Glacier 1980 1906 200425
  • 17. McCarty Glacier, Alaska 26
  • 18. Muir and Riggs Glaciers 27
  • 19. Kilimanjaro 1970 2005 28
  • 20. 1993 2000
  • 21. Qori Kalis1978 2002 Patagonia1928 2004 30
  • 22. Who cares? Glaciers and ice caps gone by 2100 Ice sheets melting too! Over 40% of world’s water supply Direct rise in sea level Reflect sunlight
  • 23. 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
  • 24. WestAntarctic Ice Sheet
  • 25. Greenland satellite melt record 1992 2005 34
  • 26. Greenland Melt Extent (April - September 25) 0.8 2002 2005 0.7Melt Extent (106 km2) 0.6 0.5 0.4 0.3 0.2 1992 1980 1985 1990 1995 2000 2005 35
  • 27. Sea-level rise
  • 28. Coastalpopulation Coastalmigration
  • 29. Sea level 18,000 5m rise in seayears ago (-70m) level7m riseGreenland OR the West Antarctic Ice Sheet Melted in sea Florida’s coast if in sea 8m rise level level
  • 30. Additional consequences Fastest extinction rate in 65 M years (1000x normal rate) Increased disease  Air-borne (e.g. asthma)  Insect-borne (e.g. malaria) More extreme weather  Droughts  Flooding  Heat-waves  Storms
  • 31. Habitat loss Mass extinction40
  • 32. GREAT LOSS TO AQUATIC LIFECoral bleaching 41 CHANGE IN LIFE FORMS
  • 33. Reduce consumption
  • 34. Plant trees
  • 35. Drive less
  • 36. Alternative energy
  • 37. Unplug
  • 38. Improve efficiency