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5 Environmental Sustainability

While transportation enhances the quality of our lives, it also generates environmental impacts. Since 1980, most transportation-related air pollutant emissions have declined. This follows national mandates for more stringent vehicle emission standards, cleaner burning fuels, and greener automobile technologies. Greenhouse gas emissions from transportation fuel use rose steadily until 2007 before decreasing in 2008 due to the economic recession and fewer vehicle miles traveled.