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Global warming by robin


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nice ppt on earth

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Global warming by robin

  2. 2. Global Warming• an average increase in the temperature of the atmosphere near the Earth’s surface and in the troposphere1, which can contribute to changes in global climate patterns
  3. 3. Causes• Burning of fossil fuels (Coal/Crude oil) – Power plants generate electricity – Transportation-----fuels for transports (E.g. LPG, kerosene, fuel oil) – Industrial processes (E.g. manufacture of cement, steel, aluminium)
  4. 4. Causes• Other greenhouse gases emission – Agriculture – Forestry – Other land uses – Waste management
  5. 5. Example : Using natural gas to cookCH4 + 2O2  CO2 + 2H2O
  6. 6. Greenhouse gases in the atmosphere ↓ Some infrared radiation is trapped ↓ Greenhouse effectSerious greenhouse effectGlobal Warming
  7. 7. How serious the problemis?...
  8. 8. Increase in greenhousegases• Concentration of greenhouse gases in the atmosphere is highly increasing by human activities → Leads to the increasing seriousness of global warming
  9. 9. Global surfacetemperatures – increased about 0.6°C/century since the late19th century – increased to 2°C/century over the past 25 years
  10. 10. Increase in Globaltemperatures
  11. 11. Temperature differencebetween different partsof atmosphere• troposphere temperatures (the lowest 8 kilometers of the Earths atmosphere) collected since 1979 also indicate warming• Cooling effect in higher parts of the atmosphere: stratospheric temperatures have been decreasing
  12. 12. Increasing temperatureextremes• Regions that have temperatures (1-3°C) warmer than the average: – United States – Most of the Europe• Regions that have temperatures (1-3°C) cooler than the average: – Australia
  13. 13. Sea level rising• rising at an average rate of 1 - 2 mm/year over the past 100 years
  14. 14. Environmental and Human Effects
  15. 15. Air Quality An increase in the concentration of ground-level ozone Damage lung tissue Harmful for those with asthma and other chronic lung diseases
  16. 16. Food supply Rising temperatures and variable precipitationDecrease the production of staple foods in many of the poorest regions Increasing risks of malnutrition
  17. 17. Population displacement Rising sea levels Increase the risk of coastal flooding (Necessitate population displacement)• More than half of the worlds population now lives within 60km of the sea.• Most vulnerable regions: Nile delta in Egypt, the Ganges- Brahmaputra delta in Bangladesh, many small islands, such as the Maldives, the Marshall Islands and Tuvalu.
  18. 18. Measures on controlling theproblem • Government * set some laws to limit the amount of pollutants produced by factories * develop the skills of using renewable fuels, e.g. solar energy, wind energy
  19. 19. Measures on controllingthe problem * encourage the factories to replace fossil fuels by renewable fuels, which would not cause environmental pollution * carry out energy saving scheme → reduce the pollution produced by burning fossil fuels * build more plants → reduce the pollutants e.g. CO2