Biodiesel Emissions Compared to Other Fuels
Fuel Types
In the table below, we give the emission characteristics of various
fuels as compared to diesel. The numbers in the table reflect
the percent difference
for a vehicle traveling for a mile on that fuel as compared to a comparable
vehicle traveling for a mile on diesel. The emissions are calculated
using the Argonne National Laboratory’s GREET Model version 1.5a.
This calculates the emissions of various gases for the entire fuel cycle.
This
includes the gathering of feedstock, fuel production, and tailpipe emissions.
This type of complete analysis is often referred to as a well-to-wheel
or fuel-cycle analysis.
While a rough comparison of fuel types can be made, it is important
to realize that these numbers can vary significantly from vehicle
to vehicle.
Therefore, any such numbers must be treated as a rough indication
of a fuel’s emissions. For this reason, all numbers have been rounded
to the nearest 5%. The fuels are ranked in order of most to least greenhouse
gas emissions - the emissions that cause global warming. The electric
category is for a battery- powered vehicle running off of the New England
power
grid. The hybrid is a diesel/electric hybrid.
From the July 31, 2001 “Report on Bus Alternatives” sponsored by HGCI, UOS, Ford Motor Company, and Harvard University (www.greencampus.harvard.edu/ green_projects/afvp/rec/bus.pdf)
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