The default carbon dioxide emission factor for biodiesel fuel is 70,800 kg/TJ, and the emission factor for diesel fuel is 74,100 kg/TJ.

a. Which diesel fuel, biodiesel or “regular” diesel fuel, has the greater carbon intensity per unit of energy?
b. What are their respective carbon intensities compared to natural gas?
c. If a city were to invest in climate-friendly buses for public transportation, should it choose a diesel-powered bus, a biodiesel-powered bus, or a natural gas-powered bus?

What will be an ideal response?


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On this imaginary horizon, which is supposed to be at eye level, the point where the lines come together is called the ____.

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Technician A says carbon-removal additives are work well when added prior to removing the engine. Technician B says carbon-removal additives should be used only in a well-ventilated area. Who is right?

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