Geography Project Global Warming


Published on

enjoy and absorb knowledge or pretend to be hahas

Published in: Education, Economy & Finance
No Downloads
Total views
On SlideShare
From Embeds
Number of Embeds
Embeds 0
No embeds

No notes for slide

Geography Project Global Warming

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