The Environmental Impacts of Automobile Centric Urban Growth
The importance of living in a sustainable environment is
clear to those concerned for the health of future generations. Unfortunately, attaining sustainability in an
automobile centric urban design is impossible; the automobile is wholly
unsustainable.
Most people even agree in understanding that the automobile
is environmentally unsustainable by looking at the air we breathe. But, beyond poor air quality there are a
myriad of other harvests of damage due to the automobile. The automobile touches every aspect of our
lives but, it is not possible to merely stop relying on the car in this society.
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From the book: The Geography of Transport Systems, author
Dr. Jean-Paul Rodrigue points out that transport has a number of relationships
between the atmosphere, the hydrosphere, the lithosphere and the ecosphere. He further shows that transportation’s main
factors considered in the physical environment are geographical location,
topography, geological structure, climate, hydrology, soil, natural vegetation
and animal life.
The amount of land consumption required to maintain a car
culture urban design is untenable for large automobile centric
populations. Loss of fertile farm land
through land consumption to maintain sprawl is common knowledge, its lingering
effects are unknown.
New findings of environmental concerns are often
unpredicted. As technology progresses, there
is an increase of discoveries regarding the direct and indirect impacts to the
ecosystem. The discoveries have led to
new policies which reduce the environmental harm from automobiles. The consistency of studies linking health
problems in air pollution to the automobile caused the State of California to
legislate regulations in an attempt to lower automobile usage.
California legislation, AB32 (“The Global Warming Solutions
Act of 2006”, now CA State law in the Health and Safety Code, Section 38500)
mandates 1990 levels of air quality by the year 2020. This represents a 25% reduction under
business as usual estimates.
Additionally, in October 2008, SB 375 was signed into law. SB 375 gives the California Air Resource
Board (CARB) authority to implement strict mandates to reach AB 32 air quality
targets. CARB is demanding the real
estate and transportation industries to find viable environmental solutions for
the harmful pollution resulting from combustion engine exhaust.
As an extreme example of unsustainable land use and the
indirect impacts; the Lake Tahoe area, in California, has an ongoing campaign
which says: “Keep Tahoe Blue”. Since the
1970s the water in Lake Tahoe has begun losing its pristine and crystal blue
brilliance. The water has taken a
greenish tint with uncommon algae growth which has infiltrated into the
formerly pristine waters. The cause is
merely disruption of the primitive earth water run off flow patterns due to
road building and driveways for parking.
An automobile is used 5% of its life; the other 95% it sets
parked. To accommodate this lack of use,
the automobile centric land-use design has to allow for locations of the car’s
idle time. Parking lots are inefficient
when empty and are inadequately inefficient when full.
There is concern in the dialog of environment about water
contamination. One of the biggest
sources of contaminates into the water table is water runoff from the
roads. The heavy air particle pollutants
of exhausted fumes fall to the ground and are gathered along the road
ways. This material is filtered in the
soil but, some unfiltered water flows directly into water sources.
The EPA (Environmental Protection
Agency) recognizes that roads, highways, and
bridges are a source of significant contributions of pollutants to the nation's
waters. Contaminants from vehicles and activities associated with road and
highway maintenance and construction are washed from roads and roadsides when
it rains or snow melts. Large amounts of this runoff pollution are carried
directly to water bodies.
The EPA identifies runoff pollution
as that associated with rainwater or melting snow that washes off roads,
bridges, parking lots, rooftops, and other impermeable surfaces. As it flows
over these surfaces, the water picks up dirt, dust, rubber and metal deposits
from tire wear, antifreeze and engine oil that has dripped onto the pavement,
pesticides and fertilizers, and discarded cups, plastic bags, cigarette butts,
pet waste, and other litter. These contaminants are carried into lakes, rivers,
streams, and oceans.
When the oils and grease leaked
onto road surfaces from car and truck engines, spilled at fueling stations are
discarded directly onto pavement or into storm sewers, the rain and snowmelt
transport these pollutants directly to surface waters.
Heavy metals come from some "natural"
sources such as minerals in rocks, vegetation, sand, and salt but, also come
from car and truck exhaust, worn tires and engine parts, brake linings,
weathered paint, and rust. Heavy metals are toxic to aquatic life which can
potentially contaminate ground water.
Legislatively in
1987, Congress established the Nonpoint Source Management Program under section
319 of the Clean Water Act (CWA), to help States address nonpoint source, or
runoff pollution by identifying waters affected by such pollution and adopting
and implementing management programs to control it. These programs recommend
where and how to use best management practices (BMPs) to prevent runoff from
becoming polluted, and where it is polluted, to reduce the amount that reaches
surface waters.
The cumulative effects of sprawl are a growing concern to
uncontrolled urban expansion. The
necessity of land-use consumption with sprawl development is not ecologically
possible to maintain.
Mankind’s technological progression has been able to take
advantage of advanced inventions but, there is a limit to Earth’s acceptable
damage. The amount of harm is by no
means insurmountable; however, the accumulative increase has reached the point
in which a tolerable level has to be discovered. Vegetation modification, hydric cycles, level
of underground water resources, soil erosion, air purification, ecosphere
capacity, food sources of agriculture, entertainment and tourism are points
that Dr. Jean-Paul Rodrigue address as critical impacts effected by the car
culture.
Environmentally, for society to reach a point of
sustainability its foundation has to be built upon an environmentally friendly
transportation source.