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global warming ppt global warming ppt Presentation Transcript

  • Index  Reasons of Global Warming  The Impact of global warming on the nature  Causes and Effects  What We Can Do
  • Solar energy passes through Radiant heat is trapped Greenhouse gases in atmosphere Reasons of Global Warming “Greenhouse gases” (e.g. carbon dioxide, methane, nitrous oxide, CFC’s) trap heat i n the earth’s atmosphere.
  • Burning carbon-containing fossil fuels produces carbon dioxide (Combustion) C + O2 CO2 CO2: The Most Significant Greenhouse Pollutant
  • CO2 + H20 HCO3 - + H+ Water becomes more acidic. (ACID) Remains in the atmosphere (greenhouse gas) Dissolves in sea water CO2 CO2 “The surface ocean currently absorbs about one-fourth of the CO2 emitted to the atmosphere from human activities.”
  • 1.8 1.4 1.1 0.7 0.4 0 -0.4 -0.7 -1.1 GlobalTemperatureChange(degF) Year1000 1200 1400 1600 1800 2000 380 360 340 320 300 280 CO2Concentration(ppm) 1000 Years of CO2 and Global Temperature Change Temperature CO2  Humans have increased carbon dioxide (CO2) in the atmosphere by more than 37% since the Industrial Revolution.
  • The Arctic Ocean could be ice-free in summer by 2040 -according to U.S. National Center for Atmospheric Research 2000 2040
  • “Climate change is the m ost severe problem that we are facing today.” “And it’s reason is nothing but the GLOBAL WARMING”
  •  Melting ice, glaciers and permafrost  Animals  Wetlands and forests  Weather and storms  People and culture 1958 2003
  • “A warming climate will damage Alaska’s infrastructure because it was designed for a cold climate.”  Damage to infrastructure may add $3.6 to $6.1 billion (10% to 20%) to future costs for public infrastructure from now to 2030 and $5.6 to $7.6 billion (10% to 12%) from now to 2080
  •  Oyster contamination in summer of 2004  Hazardous travel, hunting and fishing  Adverse dietary impacts  Beaver range expanding  Health damage from fires -- respiratory illnesses, especially in elderly, children  Water and sewer failures  West Nile virus, Lyme disease threats
  •  Bangladesh: More than 17 million people within 3 feet of sea level  Tuvalu: Island nation, highest elevation 15 ft; mostly less than 1m  Lohachara: First inhabited island (10,000 people) submerged Bangladesh Tuvalu Lohachara