Your Carbon Footprint
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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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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


US: 16% increase since 1990


Gary


US Emission by Sector


“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


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?


Counting Carbon:A Primer


Learning Goals

  • Identify main GHGs and sources

  • Explain how we quantify GHG emissions

  • Define

    • GWP

    • CO2e

    • Emissions Factor


Important Greenhouse Gases

  • CO2

  • CH4

  • N2O

  • CFCs, HCFCs, HFCs, SF6

  • See Figure SPM.3


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


GWPs


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


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)


CO2e Example


Emission Factor

  • Quantity of pollutant emitted per unit of activity.


  • Emissions Factor = 20 lbs CO2/ gallon

1 gallon gasoline = 20 lbs CO2


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


1 therm natural gas = 11 lbs CO2

  • Emissions Factor = 11 lbs CO2/ therm


Calculation Example

765 therms x 11 lbs CO2/ therm = 8,415 lbs CO2


1 kWh = 2 lbs CO2


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


1 airline mile = 1/2 lbs CO2


Electricity Usage

896 kWh

(496 kWh)

245 kWh

(175 kWh)

169 kWh

(130 kWh)


Natural Gas Usage

134 therms

(57 trms)

165 therms

(66 trms)

122 therms

(51 trms)


CO2 Footprint

1619 lbs

1076 lbs

821 lbs


Calculate Your Household’s CO2 Footprint


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.


Fin


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