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The Wedge Game . Developed by: Rob Socolow and Steve Pacala Carbon Mitigation Initiative Princeton University www.princeton.edu/~cmi. Billions of Tonnes of Carbon Emitted per Year. 14. Historical emissions. 7. 1.9 . 0. 2105. 1955. 2005. 2055. Historical emissions profile.

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The wedge game

The Wedge Game

Developed by:

Rob Socolow and Steve Pacala

Carbon Mitigation Initiative

Princeton University

www.princeton.edu/~cmi


Billions of Tonnes of Carbon Emitted per Year

14

Historical

emissions

7

1.9 

0

2105

1955

2005

2055

Historical emissions profile

  • Science, Vol 305, Issue 5686, 968-972, 13 Aug. 2004

  • Scientific American, Special Issue,pp. 50-57, Sept. 2006


The stabilization triangle

Billions of Tonnes of Carbon Emitted per Year

14

Currently projected path

Stabilization Triangle

Interim Goal

500 - 550ppm in 50 years. Steep decline beyond

Flatpath

O

Historical

emissions

7

0

2105

1955

2005

2055


Billion of Tonnes of Carbon Emitted per Year

14

14 BtC/y

Currently projected path

Seven “wedges”

O

Historical

emissions

7

Flatpath

0

2105

1955

2005

2055

Wedges

7 BtC/y


What is a wedge
What is a wedge?

An activity that reduces emissions to the atmosphere that starts at zero today and increases linearly until it accounts for 1 BtC/yr of reduced carbon emissions in 2055

1 BtC/yr

Total = 25B tonnes of carbon

50 years


What are the options?

Nuclear Fission

CO2 Capture

and Storage

14 BtC/y

Fuel Switching

Energy Efficiency and

Conservation

Stabilization

Forests & Soils

Triangle

7 BtC/y

2005

2055

Renewable Electricity and Fuels


Your task
Your Task

  • You have definitions of each of the wedges, and what each would require. You must now look at each of the definitions and pick the 7 that you think most likely economically, politically, and socially. You have 20 minutes to pick your favorite 7 wedges, and then will be asked to explain your choices.

  • NOTE: There is no “right” answer. The point of the exercise is that these are achievable goals, but each will require significant effort by society. Also, it is unlikely that any one technology can save the day alone – it will take a suite of technologies.


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