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Global
Warming Emissions
Carbon
dioxide is the predominant global warming pollutant, accounting
for eighty percent of global warming emissions. Contrary to the
goals set out in legislation recently considered in the U.S. Senate,
emissions have continued to increase. Transportation is
responsible for 32.3% of all carbon dioxide emissions in the U.S.
While the U.S. has made progress in reducing vehicles' emissions
of regulated pollutants such as ozone precursors, CO2 emissions
from the transporatation sector continue to rise.
Growing
U.S. Carbon Emissions
Source:
EERE's Transportation Energy Data Book Ed. 24
The share of
emissions produced by the transportation sector is expected to increase
faster than emissions for the entire U.S. economy. According to
the Energy Information Administration, transportation emissions
are expected to increase by 1.8% per year while the residential
and industrial sectors are expected to increase by only 1.2% and
1.0%, respectively.
Transportation's
Share of U.S. Carbon Emissions Is Increasing
Source:
EERE's Transportation Energy Data Book Ed. 24; 2025 projection
from EIA's Annual Energy Outlook (2005)
Vehicle-Based
Air Pollution
While
new cars and trucks are far cleaner than their predecessors, motor
vehicles remain the largest source of health-threatening air pollutants.
To find out how much pollution current production vehicles emit,
visit greenercars.com,
the online home of ACEEE's Green Book®: The
Environmental Guide to Cars and Trucks.
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