GHG Sources and human activities
<ul><li>Recall that the most important contributor to the  natural  greenhouse effect is  water vapour . </li></ul>
<ul><li>The most important GHG contributing to the  anthropogenic  greenhouse effect is  carbon dioxide. </li></ul>
<ul><li>Any process that  releases  carbon dioxide into the atmosphere is called a carbon  source . </li></ul>
<ul><li>For example,  burning  fossil fuels and the  respiration  of organisms are both carbon  sources . </li></ul>Source...
<ul><li>Fossil fuels are materials such as  coal ,  oil  and  gas  that were formed underground from the remains of once-l...
<ul><li>Because organisms are made up of  carbon ,  hydrogen  and  oxygen , fossil fuels are called  hydrocarbons . </li><...
<ul><li>While these fossil fuels are in the  ground , their carbon content is  undisturbed . </li></ul>
<ul><li>When they are  extracted  from the ground, they release a small amount of  methane  and  carbon dioxide  into the ...
<ul><li>When  fossil fuels  are burned to produce energy, large amounts of  carbon dioxide  and  nitrous oxide  are releas...
<ul><li>For example, for every liter of  gasoline  used in a car,  2.3 kg  of  carbon dioxide  is released into the atmosp...
Sources and Sinks
Sources and Sinks
<ul><li>Beginning in the late  1700s , the  population  of North America  grew  rapidly. </li></ul>
<ul><li>European people settled in the  forests  and started to  clear  the land of trees to provide timber for  fuel  and...
<ul><li>Before the settlers arrived, over  90%  of southern Ontario was covered with  trees . </li></ul>
<ul><li>Today, only about  38%  of that land is  forested . </li></ul>
Deforestation <ul><li>Forests play an important role in  removing  carbon dioxide from the air through the process of  pho...
<ul><li>Photosynthesis  is a carbon  sink , which is any process that takes carbon dioxide from the atmosphere and  stores...
<ul><li>Deforestation  in North and South America over the last two centuries has reduced Earth’s  carbon sink  and decrea...
<ul><li>Both  natural  processes and  human  activities can affect carbon  sources  and  sinks . </li></ul>
<ul><li>For example, if a  forest fire  is started, whether by  lightning  or  people  camping, the forest is no longer a ...
<ul><li>Instead, the burning forest  releases  CO 2  into the atmosphere, becoming a carbon  source . </li></ul>
<ul><li>Human activities, such as the production of  electrical energy  or the use of  fossil fuels , release large amount...
Sources and Sinks <ul><li>It is easy to conclude that large  industries  and  electricity  generation are a main cause of ...
<ul><li>Consider the amount of  garbage  generated by your household or school… </li></ul>Sources and Sinks
<ul><li>Garbage in a landfill requires  space , and it is broken down by  anaerobic bacteria .  This process adds  methane...
<ul><li>As well, North Americans purchase many  disposable  products. </li></ul>Sources and Sinks
<ul><li>It takes energy to  manufacture  these products, and they take up space in  landfill  sites after being used just ...
<ul><li>North Americans  consume  much more than people in many other countries. </li></ul>
<ul><li>Also consider the amount of  electricity  you use at home… </li></ul>
<ul><li>… or the number of  lights  left on in office buildings at night. </li></ul>
<ul><li>Think about how far  trucks  must travel to deliver the  goods  we want. </li></ul>
<ul><li>These are just some examples of the many ways we contribute to greenhouse gas emissions and hence climate change. ...
<ul><li>www.storyofstuff.com </li></ul>
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GHG Sources & Human Activities

  1. 1. GHG Sources and human activities
  2. 2. <ul><li>Recall that the most important contributor to the natural greenhouse effect is water vapour . </li></ul>
  3. 3. <ul><li>The most important GHG contributing to the anthropogenic greenhouse effect is carbon dioxide. </li></ul>
  4. 4. <ul><li>Any process that releases carbon dioxide into the atmosphere is called a carbon source . </li></ul>
  5. 5. <ul><li>For example, burning fossil fuels and the respiration of organisms are both carbon sources . </li></ul>Sources and Sinks
  6. 6. <ul><li>Fossil fuels are materials such as coal , oil and gas that were formed underground from the remains of once-living organisms . </li></ul>Sources and Sinks
  7. 7. <ul><li>Because organisms are made up of carbon , hydrogen and oxygen , fossil fuels are called hydrocarbons . </li></ul>Sources and Sinks
  8. 8. <ul><li>While these fossil fuels are in the ground , their carbon content is undisturbed . </li></ul>
  9. 9. <ul><li>When they are extracted from the ground, they release a small amount of methane and carbon dioxide into the atmosphere. </li></ul>
  10. 10. <ul><li>When fossil fuels are burned to produce energy, large amounts of carbon dioxide and nitrous oxide are released. </li></ul>
  11. 11. <ul><li>For example, for every liter of gasoline used in a car, 2.3 kg of carbon dioxide is released into the atmosphere. </li></ul>Sources and Sinks
  12. 12. Sources and Sinks
  13. 13. Sources and Sinks
  14. 14. <ul><li>Beginning in the late 1700s , the population of North America grew rapidly. </li></ul>
  15. 15. <ul><li>European people settled in the forests and started to clear the land of trees to provide timber for fuel and to prepare land for agriculture . </li></ul>
  16. 16. <ul><li>Before the settlers arrived, over 90% of southern Ontario was covered with trees . </li></ul>
  17. 17. <ul><li>Today, only about 38% of that land is forested . </li></ul>
  18. 18. Deforestation <ul><li>Forests play an important role in removing carbon dioxide from the air through the process of photosynthesis . </li></ul>
  19. 19. <ul><li>Photosynthesis is a carbon sink , which is any process that takes carbon dioxide from the atmosphere and stores it. </li></ul>Deforestation
  20. 20. <ul><li>Deforestation in North and South America over the last two centuries has reduced Earth’s carbon sink and decreased the amount of CO 2 being removed from the atmosphere . </li></ul>
  21. 21. <ul><li>Both natural processes and human activities can affect carbon sources and sinks . </li></ul>
  22. 22. <ul><li>For example, if a forest fire is started, whether by lightning or people camping, the forest is no longer a carbon sink . </li></ul>Sources and Sinks
  23. 23. <ul><li>Instead, the burning forest releases CO 2 into the atmosphere, becoming a carbon source . </li></ul>
  24. 24. <ul><li>Human activities, such as the production of electrical energy or the use of fossil fuels , release large amounts of carbon dioxide into the atmosphere. </li></ul>Sources and Sinks
  25. 25. Sources and Sinks <ul><li>It is easy to conclude that large industries and electricity generation are a main cause of the problem, but personal lifestyle choices also contribute to greenhouse gas emissions . </li></ul>
  26. 26. <ul><li>Consider the amount of garbage generated by your household or school… </li></ul>Sources and Sinks
  27. 27. <ul><li>Garbage in a landfill requires space , and it is broken down by anaerobic bacteria . This process adds methane - a greenhouse gas - to the atmosphere. </li></ul>
  28. 28. <ul><li>As well, North Americans purchase many disposable products. </li></ul>Sources and Sinks
  29. 29. <ul><li>It takes energy to manufacture these products, and they take up space in landfill sites after being used just once . </li></ul>
  30. 30. <ul><li>North Americans consume much more than people in many other countries. </li></ul>
  31. 31. <ul><li>Also consider the amount of electricity you use at home… </li></ul>
  32. 32. <ul><li>… or the number of lights left on in office buildings at night. </li></ul>
  33. 33. <ul><li>Think about how far trucks must travel to deliver the goods we want. </li></ul>
  34. 34. <ul><li>These are just some examples of the many ways we contribute to greenhouse gas emissions and hence climate change. </li></ul>Sources and Sinks
  35. 35. <ul><li>www.storyofstuff.com </li></ul>

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