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Geography Project Global Warming


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enjoy and absorb knowledge or pretend to be hahas

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  • 1. Unit19: Global Warming By : An Jiasheng (23) Andrew Lam (24) Chong Kai Xiang (26) Class: 203
  • 2. What is global Warming?
    • Due to recent human activities , there is an increase in air pollutants in our atmosphere.
    • These air pollutants are keeping excess heat within the earth’s atmosphere.
    • These “enhanced Green house effect” caused by pollutants traps more infra-red radiation and cause Earth’s climate to heat up.
  • 3. Extent of global warming
    • Global Warming affects the whole world.
    • Example ,due to global warming ,mean surface area of the world went up. Most places in the world have higher temperature than usual.
  • 4. Causes of global warming
    • Greenhouse gases present in the atmosphere.
      • Methane(CH 4 )
      • Nitrous Oxide(N 2 O)
      • Carbon Dioxide(CO 2 )
      • Chlorofluorocarbons(CFCs)
  • 5. Methane (10% of greenhouse gases in atmosphere)
    • Natural by-product of bacterial actions in the stomach of livestock and in the water of rice field.
    • In keeping with the effort to increase food supply, more methane will be released into the air.
  • 6. Nitrous oxide (5% of greenhouse gases in atmosphere)
    • Emitted through burning of fuels and use of chemical fertilizers containing nitrogen.
  • 7. Carbon dioxide (72% of the greenhouse gases in atmosphere.
    • Released when any form of burning takes place.
    • Burning of fossil fuels and large-scale destruction of forests (deforestation)are main cause of increase of carbon dioxide.
  • 8. CFCs (13% of the greenhouse gases in atmosphere
    • Man-made chemicals used in manufacturing of aerosols, air-con and refrigerator .
  • 9. Consequences of global warming (the Environment)
    • Scientists predict that average world temperature will rise by 0.5 Celsius every 10 years over the next 100 years. After the increase of more than 6 degrees, we shall die .
    • Due to increase in evaporation
      • More rain will likely to fall in tropical regions
      • Temperate regions will experience longer and drier summer, shorter and wetter winter.
      • There will be more droughts in the interior of north America and Russia and more storms in Asia .
  • 10. Environment
    • Polar ice caps and glaciers will melt and shrink.
    • This may cause …
      • Sea level to rise by 3 meters
      • Low-lying regions will be flooded
    • There will be more storms and land slides and increased river flooding.
  • 11. Effects of climate change
    • In tropical regions where floods or droughts are expected, crop yields will decline.
    • Present arable lands in temperate regions will also suffer due to a longer and drier summer season.
    • However, present dry places will experience more rain causing their yields to increase.
  • 12. Effects of sea level changes by the year 2050
    • Islands in South Pacific Ocean could be submerged
    • Settlements, port facilities and coastal structure might be damaged
    • Countries like Venice and London will sink.
    • Water supply to coastal settlements will be affected when salt water seeps into groundwater due to flooding making the water to saline.
    • River Delta will be flooded, affecting people living there.
    • Wildlife in salt marshes and coral reefs will be threatened.
    • Mangrove swamps with its species will be destroyed.
  • 13. Measures to reduce the impact of global warming
    • Reduce CO 2 emission
      • On the world scale
        • Earth summit 1992, 154 countries pledge to stabilize emission by 2000
      • On the country scale
        • Impose carbon tax
        • Introduce energy substitutes like solar energy.
        • Retain trees to absorb carbon dioxide
        • Introduce measures to save electricity
      • Individual scale
        • Switch off electric appliances when not in use.
  • 14. Continue …
    • Reduce nitrous oxide emission
      • World scale
        • NIL
      • Country scale
        • Improve public transport
        • Reduce use of chemical fertilizer containing nitrogen
      • Individual scale
        • Use public transport rather than private owned transport.
  • 15. Continue…
    • Reduce methane emission
      • World scale
        • Stop cows from farting. Reduces 10kg of methane every year 
      • Country scale
        • Reduce demand for meat & rice product.
      • Individual scale
        • Find food substitutes for meat and rice.
  • 16. Continue…
    • Reduce CFCs emission
      • World scale
        • Montreal Protocol signed by 92 countries in 1992.
      • Country scale
        • Ban the use of CFCs
      • Individual scale
        • Buy only non-CFC products
  • 17. Adjusting to the effect of global warming
    • Rising sea level
      • Country scale
        • Limit the no. of buildings built along the coast.
        • Provide coastal protection such as dykes.
      • Individual scale
        • Develop right attitude and help reduce any form of heat increase to the atmosphere.
        • Switch off any unused fans or lights.
        • Reduce comforts of energy consuming appliances like dishwasher and air-con.
  • 18. Continue..
    • More frequent drought conditions
      • Country scale
        • Initiate research to produce new crops which can grew in dry conditions.
        • Introduce efficient irrigation system
      • Individual scale
        • Adopt right attitude towards using water
        • Consciously save water
  • 19. Continue….
    • Extinction of wildlife and plant species
      • Country scale
        • expand and create wildlife reserves
        • Create a global network of corridors of natural vegetation to allow for free movement of species.
      • Individual scale
        • Aware of ecological problems and solutions
        • Respect natural habitat
        • Decision makers and profit making developers should conserve rather than recreate.
  • 20. we hope this power point slide is helpful to your learning. Thank you! The End