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Carbon Dioxide Output Percentage Change

  • Thread starter shubu
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Homework Statement


Question: If petroleum used in transportation were replaced by electricity generated by coal, what would be the percentage change in carbon dioxide output?

Refer to the following diagrams for values:


Given Information:
  • Petroleum has an efficiency rating of 1/4 in transportation.
  • Coal that is burned to produce electricity has 1/3 efficiency.
  • Petroleum has 2/3 the carbon footprint of coal.
  • Switching to coal means: using less of a fuel; fuel has higher carbon footprint.


Homework Equations


[itex]Percentage \ change = \frac{Initial - Final}{|Initial|}[/itex]

The Attempt at a Solution


[itex]Percentage \ change = \frac{1170 - 1180}{|1170|} \\[/itex]
[itex]Percentage \ change = -0.56\%[/itex]
 

Answers and Replies

  • #2
haruspex
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I don't know which numbers you fished out of those table to arrive at 1170 and 1180, but you do not need those tables at all for this question.
Suppose you need X units of transport energy. How many units of petrol would you need for that? What would be the number of CO2 units produced? Do the same calculation for coal.
 

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