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Your Carbon Footprint Unit 4 Lesson 4

Your Carbon Footprint Unit 4 Lesson 4. Addicted to Carbon?. Big Footprints. Image source: The Guardian. Growing Footprints. Image source: The Guardian. Per Capita Emissions. World CO per capita and total. CO2 400k yra. Mona loa. Mona loa 2009. GHG Emissions. Ag and land use.

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Your Carbon Footprint Unit 4 Lesson 4

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  1. Your Carbon Footprint Unit 4 Lesson 4

  2. Addicted to Carbon?

  3. Big Footprints Image source: The Guardian

  4. Growing Footprints Image source: The Guardian

  5. Per Capita Emissions

  6. World CO per capita and total

  7. CO2 400k yra

  8. Mona loa

  9. Mona loa 2009

  10. GHG Emissions

  11. Ag and land use

  12. US: 16% increase since 1990

  13. Gary

  14. US Emission by Sector

  15. “Once our personal connection to what is wrong becomes clear, then we have to choose: we can go on as before, recognizing our dishonesty and living with it the best we can, or we can begin the effort to change the way we think and live.” -Wendell Berry

  16. Two Simple Questions: • Are we putting things into nature faster than they can break down? • Are we taking things out of nature faster than they can regenerate?

  17. Counting Carbon:A Primer

  18. Learning Goals • Identify main GHGs and sources • Explain how we quantify GHG emissions • Define • GWP • CO2e • Emissions Factor

  19. Important Greenhouse Gases • CO2 • CH4 • N2O • CFCs, HCFCs, HFCs, SF6 • See Figure SPM.3

  20. Global Warming Potential • GWP is the measure of the warming that will be caused by 1 ton of a gas compared to the warming that will be caused by one ton of CO2

  21. GWPs

  22. 1 ton of CH4 will produce the same warming as 23 tons of CO2 Global Warming Potential (GWP)1 ton of CH4 = 23 tons of CO2e

  23. A common unit that allows the direct comparison of emissions of different GHGs to each other. The CO2e represents the amount of CO2 emissions required to produce the same warming. CO2 Equivalent (CO2e)

  24. CO2e Example

  25. Emission Factor • Quantity of pollutant emitted per unit of activity.

  26. Emissions Factor = 20 lbs CO2/ gallon 1 gallon gasoline = 20 lbs CO2

  27. Calculation Example: Single Trip • 18 miles / 50.3 mpg = 0.36 gallons gas • 0.36 gallons gas x 19.6 lbs CO2/gallon =7 lbs CO2

  28. 1 therm natural gas = 11 lbs CO2 • Emissions Factor = 11 lbs CO2/ therm

  29. Calculation Example 765 therms x 11 lbs CO2/ therm = 8,415 lbs CO2

  30. 1 kWh = 2 lbs CO2

  31. Calculation Example: Office Computers 920 kWh x 2 lbs CO2/ kWh = 1840 lbs CO2 50 work hrs/ wk 118 non work hrs/wk 6,136 non work hrs/yr 150 watts 920.4 kWh/year

  32. 1 airline mile = 1/2 lbs CO2

  33. Electricity Usage 896 kWh (496 kWh) 245 kWh (175 kWh) 169 kWh (130 kWh)

  34. Natural Gas Usage 134 therms (57 trms) 165 therms (66 trms) 122 therms (51 trms)

  35. CO2 Footprint 1619 lbs 1076 lbs 821 lbs

  36. Calculate Your Household’s CO2 Footprint

  37. Lesson Recap • The same amount of each gas will cause different amounts of warming (GWP) • CO2e provide a single unit to compare emissions of any GHG • CO2 has the lowest GWP (1) but is the most important GHG because… • Emission factors indicates the amount of pollution per unit activity.

  38. Fin

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