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According to various sources, including the Energy
Information Administration (EIA), anywhere from 22 to 28 percent of energy
consumed in the United States is used for transportation. The majority of this
energy (63%
in 2005) is used by light vehicles.
(<-- Credit: Evidence
based Living)
This comes as no surprise to many of us who travel to work,
school, and other places every day. The volume of cars on the road has steadily
risen over the years up until 2008; since then, the economy has caused total
registered vehicle numbers to hover around some 250
million, with well over half of these being classified as cars. This is all
in the nation which was (until
recently) the largest market for passenger vehicles in the world.
We are a nation dependent on having our own transportation,
and for many of us that means we are dependent on oil. In terms of energy, the
numbers aren't encouraging; they show an industry dominated by the use of
petroleum (at over 94%). On the reverse side, the transportation sector takes
up around 70% of all petroleum use in the U.S. R&D into fuels and vehicle
technology has presented us with a number of options for petroleum alternatives:
- Hydrogen and fuel cells
- Compressed natural gas (CNG)
- Liquefied natural gas (LNG) or propane (LPG)
- Electric vehicles (EVs)
- Ethanol and flexible fuels
- Biodiesel
All of these provide an alternative to petroleum. But each
also suffers from severe limitations which hinders its use and prevents its
implementation on a large scale.

One of the main issues with some of these technologies is
the need for new infrastructure. Should electric cars be the answer, it will
take many years and millions/billions of dollars to construct the number of
battery recharging/replacement stations needed to sustain an abundance of EVs.
The power required for EVs will also require the addition of many more power
plants to meet the greatly increased grid energy demand. Biofuel and hydrogen
alternatives would likewise require infrastructure overhauls to accommodate the
different transportation and storage methods needed, in addition to the massive
resources required for fuel production.
(Credit: Gadgetreview -->)
Assuming new technology is not a fix-all solution, the other
"option" to reduce petroleum dependence is the increased utilization of mass
transportation. A full city bus or train is much more fuel efficient than a
regular car; for those that have access to it, it may also be more cost
effective. But of course, many people (especially those outside of cities) do
not have convenient access to mass transportation, and buses and trains are not
near-full the majority of the time(the average passenger count for a city bus
is nine over its daily drive). An overhaul of the mass transportation system in
many cities and suburbs would be needed in order to have a big impact in the amount
of petroleum used in the industry.
Having a driver's license and owning a car has been built
into American culture. And let's face it, independent mobility is a luxury and
convenience that in an ideal world everybody should have in some form or
another. But a reality based on petroleum-fueled cars is not forever sustainable
as population continues to grow, politics change, and resources drain. One or more
alternatives will eventually need to step in, and it will be interesting to see
how the U.S. infrastructure surrounding the transportation sector will adapt
along with the changes.
References
EIA Annual Energy
Review - Section 2, Figure 2.0 (pdf)
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