Global Warming


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Global Warming

  1. 1. Global WarmingAn iceberg melts in Kulusuk, Greenland, near the Arctic Circle.
  2. 2. •Global warming is a rise inglobal temperatures thatcould result from theincreased absorptionof radiation due to higherlevels ofgreenhouse gases.
  3. 3. •50% of all radiation that reaches the Earth isabsorbed. The remaining 50% is reflected backout to space.
  4. 4. •The greenhouse effect isthe natural heating ofEarth’s surface caused bythe retention of heat bycertain atmospheric gasescalled greenhouse gases.•Scientists theorize that anyincrease in the amount ofgreenhouse gases, particularcarbon dioxide (CO2), wouldresult in the increasedabsorptionof radiation.
  5. 5. 1. GreenhouseEffect isresponsible forthe Earth’swarm andlivable climate.
  6. 6. 2. Greenhousegases include:a.Water vaporb.Methanec.Carbondioxided.Ozonee.Nitrous oxide
  7. 7. 3. The sunsendsradiation.
  8. 8. 4. Some of4. Atmosphere:the sun’sheat is the energy.The Atmosphere reflects reflected by the atmosphere.
  9. 9. 5) On Earth: Energy that passes through, are absorbed by the ground, water, gases, and plants.•A portion of the solarradiation that reachesthe Earth’s surfacesuch as ice, snow, andocean are reflected.
  10. 10. 6. Radiation trigger the greenhouseRadiation trigger the gases togases togreenhouse move.move.aAs a result,the As result, theatmosphere is heated. atmosphere is heated.
  11. 11. Consequences of Global Warming:• Unless we act now, your children will inherit a hotter world, dirtier air and water, more severe floods and droughts, and more wildfires.I. CLIMATE PATTERN CHANGES ecosystem shifts and species die-off a. warmer temperatures b. drought and wildfire c. more intense rainstorms Greater evaporation as a result of global warming could increase the risk of wildfires.
  12. 12. II. HEALTH EFFECTS a. deadly heat waves and the spread ofGreater evaporation as a result of global disease warming could increase the risk of wildfires. More frequent and more intensive heat waves could result in more heat-related deaths. Photo: Gary Braasch, Chicago, July 1995. See the World View of Global Warming website for more Gary Braasch photos illustrating the consequences of the changing climate.
  13. 13. III. WARMING WATER a. more powerful hurricanes b. melting glaciers c. sea-level riseThe satellite photo at far left shows the Larson B ice shelf on Jan. 31, 2002. Ice appears as solidwhite. Moving to the right, in photos taken Feb. 17 and Feb. 23, the ice begins to disintegrate. In thephotos at far right, taken Mar. 5 and Mar 7, note water (blue) where solid ice had been, and that aportion of the shelf is drifting away. Photos: National Aeronautics and Space Administration
  14. 14. Ancient ice shelf breaks freeA giant ice shelf the size of 11,000 football fields has snapped free from CanadasArctic, scientists said. The mass of ice broke clear 16 months ago from the coastof Ellesmere Island.
  15. 15. •Credit•Jacques Descloitres, MODIS Rapid Response Team, NASA/GSFCThe Arctic’s largest ice shelf is breaking up. The WardHunt Ice Shelf is a remnant of the compacted snow andancient sea ice that extended along the northern shoresof Ellesmere Island in Northern Canada until the early
  16. 16. IV. ECOSYSTEMDISRUPTIONa. ecosystem shifts andspecies die-off.Warmer temperatures may cause someecosystems, including alpine meadowsin the Rocky Mountains, to disappear.For more Environmental Facts:Natural Resources Defense Council
  17. 17. This file photo provided byMary Sage shows a polarbear watching a whalingcrew off shore near Barrow,Alaska, Monday, May 22,2006. Polar bears are indeep trouble because ofglobal warming and otherfactors and deserve federalprotection under theEndangered Species Act,the Bush administration isproposing Wednesday, Dec.27, 2006. (APPhoto/Courtesy of MarySage, Joseph NapaaqtuqSage)
  18. 18. Polar Bears are dying at alarming rates due to Global Warming.
  19. 19. Blue Man Group – Earth to America (Global Warming) 1:49 min
  20. 20. How Do Ice Cores of Glaciers Tell Us about Past Climates?•Research scientists collect and study glacial ice cores.•Data from these ice cores provide one of the mostcomplete records of past climate conditions. Of greatestinterest are the deep cores obtained by drilling programs inSummit, Greenland and Vostok, Antarctica.•The Vostok ice core provides the longest continuousrecord of Antarctic climatic history.•Analysis of the core has been completed to a depth of3350 meters, representing approximately 440,000years of climate history.
  21. 21. Vostok ice core drilling site, Antarctica
  22. 22. Ice coresreveal thestory of Earthsclimate inreverse order.The uppermostlayers of thecore tell themost recenthistory, withincreasinglydeeper layersproviding arecord ofprogressivelyolder periods(Law ofSuperposition).
  23. 23. Scientists can determine the amount of carbon dioxidethat was in the air during different time periods byanalyzing gas bubbles trapped in ice cores. Carbondioxide is a greenhouse gas that plays a major role in theatmosphere’s energy balance.
  24. 24. Scientists can reconstruct a record of temperatures thatoccurred in the past by analyzing the ratio of oxygen isotopestrapped within air bubbles in the ice (O16 & O18).The graph below shows how the temperature has changed overthe past 165,000 years. The graph shows temperatureanomalies—variations in the temperature above or belowVostok’s present day average temperature of -56ºC. High LOW
  25. 25. Temperature and carbon dioxide data are plotted togetheron this graph. This makes it easier to compare the twovariables and how they may be related.
  26. 26. Recent Changes in Atmospheric Carbon DioxideScientists have been precisely measuring the amount ofcarbon dioxide in the atmosphere since 1958. The resultsof these studies are plotted on the graph below. Theyearly average CO2 level is represented by the smoothblack line, and seasonal changes appear as small peaksand dips.
  27. 27. Ice core research projects are working to extend the record ofglobal climate further back in time and over more of Earth’ssurface.
  28. 28. To learn about their most recent discoveries, visit the linksprovided:Explore these links for more information about ice coreprojects and climate research:Graph of Vostok ice core data extending back for 400,000 yearsGreenland Ice Sheet Project 2North Greenland Ice Core ProjectTaylor Dome Ice Core ProjectEuropean Project for Ice Coring in Antarctica (EPICA)World Data Center for PaleoclimatologyCollection of photographs about polar ice core researchNational Ice Core Laboratory