Background
Tailpipe greenhouse gas (GHG) emissions from
transportation sources account for 29 percent of
total U.S. GHG emissions in 2008, and over 5 percent
of global GHG emissions. Including other life
cycle processes—such as the extraction and refining
of fuel, the manufacture of vehicles and the construction
and maintenance of infrastructure—the
U.S. transportation sector accounts for almost 8
percent of global GHGs. The majority of transportation’s
operating emissions, totaling 58 percent,
come from light-duty vehicles, followed by freight
trucks at 20 percent and aircraft at 12 percent. Between
1990 and 2008, GHG emissions from U.S.
transportation increased 22 percent, while emissions
from all other sectors increased by roughly 11
percent. The Intergovernmental Panel on Climate
Change (IPCC) estimates that in the absence of
additional climate policies to reduce GHG emissions,
baseline global GHG emissions from human
sources will increase between 25 percent and 90
percent between 2000 and 2030, with CO2 emissions from energy use growing between 40 and
110 percent over the same period.
Further Reading:
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Mitigation_One_Pager.pdf 
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