People who want to celebrate Earth Day week by commuting in a vehicle powered by a cleaner-burning fuel should hop on the bus.
More than a third of the nation's city transit buses are now powered by fuels other than diesel. That's up from fewer than 10% a decade ago, according to the American Public Transportation Association citing January 2011 data.
That compares with about 9 million passenger automobiles in the USA that ran on alternative fuels in 2010, according to the U.S. Energy Administration; that's less than 3% of the total.
Transit agencies across the nation, spurred by federal incentives for buying and using greener vehicles and by the potential savings of switching from diesel, are transitioning to buses that run on compressed natural gas, propane, diesel-electric hybrids and biodiesel. In total, there are more than 66,200 city buses in the country.
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