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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



Big footprints
Big Footprints

Image source: The Guardian


Growing footprints
Growing Footprints

Image source: The Guardian












“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
Two Simple Questions: 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.”

  • 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
Counting Carbon: 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.”A Primer


Learning goals
Learning Goals 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.”

  • Identify main GHGs and sources

  • Explain how we quantify GHG emissions

  • Define

    • GWP

    • CO2e

    • Emissions Factor


Important greenhouse gases
Important Greenhouse Gases 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.”

  • CO2

  • CH4

  • N2O

  • CFCs, HCFCs, HFCs, SF6

  • See Figure SPM.3


Global warming potential
Global Warming Potential 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.”

  • 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 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.”


Global warming potential gwp 1 ton of ch 4 23 tons of co 2 e

1 ton of CH4 will produce the same warming as 23 tons of CO2 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.”

Global Warming Potential (GWP)1 ton of CH4 = 23 tons of CO2e


Co 2 equivalent co 2 e

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
CO2e Example of different GHGs to each other.


Emission factor
Emission Factor of different GHGs to each other.

  • Quantity of pollutant emitted per unit of activity.


1 gallon gasoline = 20 lbs CO2


Calculation example single trip
Calculation Example: of different GHGs to each other.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 co 2
1 of different GHGs to each other.therm natural gas = 11 lbs CO2

  • Emissions Factor = 11 lbs CO2/ therm


Calculation example
Calculation Example of different GHGs to each other.

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


1 kwh 2 lbs co 2
1 kWh = 2 lbs CO of different GHGs to each other.2


Calculation example office computers
Calculation Example: of different GHGs to each other. 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 co 2
1 airline mile = 1/2 lbs CO of different GHGs to each other.2


Electricity usage
Electricity Usage of different GHGs to each other.

896 kWh

(496 kWh)

245 kWh

(175 kWh)

169 kWh

(130 kWh)


Natural gas usage
Natural Gas Usage of different GHGs to each other.

134 therms

(57 trms)

165 therms

(66 trms)

122 therms

(51 trms)


Co 2 footprint
CO of different GHGs to each other.2 Footprint

1619 lbs

1076 lbs

821 lbs


Calculate your household s co2 footprint
Calculate Your Household’s CO2 Footprint of different GHGs to each other.


Lesson recap
Lesson Recap of different GHGs to each other.

  • 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 of different GHGs to each other.


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