Global warming


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Global warming

  1. 1. Topic What Is Global Warming How Global Warming Occurs Effects Of Global Warming How To Prevent It
  2. 2. History Of Earth’s Climate Earth formed ~4.6 billion years ago Originally very hot Sun’s energy output only 70% of present Liquid water present ~4.3 billion years
  3. 3. Continued… Life appeared ~3.8 billion years ago Photosynthesis began 3.5-2.5 billion years ago  Produced oxygen and removed carbon dioxide and methane (greenhouse gases)  Earth went through periods of cooling (“Snowball Earth”) and warming
  4. 4. What Is GLOBAL WARMING? Global warming is the rise in the average temperature of Earths atmosphere and oceans since the late 19th century and its projected continuation.
  5. 5. Continued… Since the early 20th century, Earths mean surface temperature has increased by about 0.8 °C (1.4 °F), with about two-thirds of the increase occurring since 1980.
  6. 6. Green House Effect The greenhouse effect is the process by which absorption and emission of infrared radiation by gases In the atmosphere warm a planets lower atmosphere and surface.
  7. 7. Effects on Wetlands and Forests Over the last 5 decades, in areas of the Kenai NWR: Open areas decreased by 34% Wet areas decreased by USFWS photo 88% Water and lakes decreased by 14% USFWS photo courtesy Ed Berg
  8. 8. % Decrease in % Decrease in Area Study Area Number of Ponds of PondsCopper River Basin 54 % 28 %Minto Flats SGR 36 % 25 %Innoko Flats NWR 30 % 31 %Yukon Flats NWR 10 % 18 %
  9. 9. Ocean Acidification “The surface ocean currently absorbs about one-fourth of the CO2 emitted to the atmosphere from human activities.” Monaco Declaration 2008 Remains in the atmosphere (greenhouse gas) Dissolves in sea waterCO2 + H20 HCO3- + H+ (ACID) CO2 Water becomes CO2 more acidic.
  10. 10.  The ozone layer protects the Earth from the ultraviolet rays sent down by the sun. If the ozone layer is depleted by human action, the effects on the planet could be catastrophic.
  11. 11.  Deaths from global warming will double in just 25 years, to 300,000 people a year. Heat waves will be more frequent and intense. Droughts and wildfires will occur more often. The Arctic Ocean could be ice free by 2050.
  12. 12. MELTING OF ICE IN ICE-LANDS Two main factors contributed to observed sea level rise. The first is thermal expansion: as ocean water warms, it expands. The second is from the contribution of land-based ice due to increased melting. The major store of water on land is found in glaciers and ice sheets.
  13. 13. SOME MESUREMENT OF OCEANLEVEL Between 1870 and 2004, global average sea levels rose 195 mm . From 1950 to 2009, measurements show an average annual rise in sea level of 1.7 ± 0.3 mm per year, with satellite data showing a rise of 3.3 ± 0.4 mm per year from 1993 to 2009
  14. 14. Which type of arctic & aquaticanimal can affected due to globalwarming
  15. 15. Process of global warming onaquatic animal Because of global warming the temperature increases. It passes heat to ocean. Then the water becomes less dense due to heat. Less dense water separates from a nutrient-filled cold layer below. Then the food chain of all animal broke or Change natural habitats and food supply
  16. 16. Reduce our consumption of fossil fuelsBecause greenhouse gas emissions are tied very closely to our energyconsumption, using less fossil fuel based energy puts fewergreenhouse gases into the atmosphere. Mountaintop removal forThis will help slow global warming. coal mining near Rawl, West Virginia. 50% of electricity in the United States is produced from coal.
  17. 17. We can make some simple substitutionsReplacing just 1 incandescent light bulb with 1 compactflorescent bulb saves about 150 pounds of carbondioxide per year!If every American household replaced just 5 high-useincandescent bulbs with compact florescent lights wedcollectively save more than $8 billion each year in energy costsand we would prevent the greenhouse gases equivalent to theemissions from nearly 10 million cars.
  18. 18. What We Can Do Use Wind Energy Reduce CO2 Emission Action is essential at every level  Individual  International Plant & Save trees Recycle the product
  19. 19.  Useless usage of ACs and Refrigerators should be stopped because from them harmful rays cfcs are emitted which results in depletion of ozone layer and from that hole UV rays of Sun comes to the earth and cause many diseases to both animals and plants i.e. Skin cancer etc.
  20. 20.  We have Collected all information from following links: