New York's 'Green' Yellow Cabs

"Nearly 400 fuel-efficient hybrids have been tested in the city's taxi fleet over the past 18 months."

"Under Bloomberg's plan, that number will increase to 1,000 by October 2008, then will grow by about 20 percent each year until 2012, when every yellow cab -- currently numbering 13,000 -- will be a hybrid."

"In addition to making the yellow cab brigade entirely green within five years, the city will require all new vehicles entering the fleet after October 2008 to achieve a minimum of 25 miles per gallon. A year later, all new vehicles must get 30 miles per gallon and be hybrid."

"Turning over the taxi fleet by 2012 is not an impossible goal. The life of a New York City taxi is typically about three to five years; the city's Taxi and Limousine Commission requires all vehicles to be retired within a certain time frame."