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'Green' Transport * USA - Think Twice About, say Scientists
CAL,USA -Agence France Presse -8 June 2009: -- Environmental engineers Mikhail Chester and Arpad Horvath at the University of California at Davis say that when various hidden or displaced emissions are included, the U.S. system of public transportation may not be as environmentally friendly as people suppose... The overall environmental friendliness will depend on seat occupancy and the underlying carbon cost, such as the burning of dirty fossil fuels to power Boston's high-energy-efficiency metro system. By contrast, San Francisco has a less energy efficient local railway, but its lower reliance on fossil fuels makes it greener overall, the scientists say... "We are encouraging people to look at not the average ranking of modes, because there is a different basket of configurations that determine the outcome," Chester says. "There's no overall solution that's the same all the time."... In addition to the fuels for powering the overall system, other hidden and displaced emissions include the emissions from building and maintaining the infrastructure... (Yahoo! News Photos: A metro train pulls into a station)Labels: green transport
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