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Fossil Fuels and Energy

  1. Oct 30, 2015 #1
    1. The problem statement, all variables and given/known data
    Today, globally, only 2% of our energy comes from carbon-free energy sources. If we continue economic and population growth in a business-as-usual scenario, what % of our energy needs to come from carbon-free sources if we want to stabilize our atmosphere at 450 ppm? [Use your answer from Q4, to calculate the %].
    Answer from Q4= 14.7 tetrawatts are required to stabilize at 450ppm in 2050

    2. Relevant equations

    3. The attempt at a solution
    I really think that I have to find the amount of energy that carbon-free sources have in average.
    I am using this model http://forecast.uchicago.edu/kaya.html
  2. jcsd
  3. Oct 30, 2015 #2


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    What is Q4?
  4. Oct 30, 2015 #3
    sorry question 4. Question 4 asked me to find the required energy to stabilize the atmosphere at 450ppm in 2050. I did that with the model of the link in the description.
  5. Oct 30, 2015 #4


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    It doesn't require energy to stabilize atmospheric C content (and your answer isn't energy either..)
    Can you post the question word for word? It's hard to offer assistance without the full story.
  6. Oct 30, 2015 #5
    That's the whole question. I calculated the 14.7 tetrawatts by using the model in the description of the problem. If you set the model in the mode carbon-free energy needed , you will realize that in 2050, 14.7 tetrawatts of energy are required to stabilize the atmosphere at 450ppm.
  7. Oct 30, 2015 #6


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    14.7 Terawatts of power.
    The problem would be more accurately stated as something like:
    'To maintain projected global power consumption and also stabilize C at 450ppm how much carbon free power must be produced in 2050?'

    Anyway, I get 7.144 Terawatts, which may be because we are using different growth rates, I left them at the default, all zero.

    Back to your original question; To find what percent of C free power is of total power; You know C free power already and the total power can be found on the (mislabelled) total energy production graph.
  8. Oct 30, 2015 #7
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