Gov. Martin O?Malley announced Tuesday the state would replace three-quarters of the Mass Transit Administration?s diesel bus fleet by 2014 with 500 hybrid vehicles that would cost 50 percent more, but save money in the long run and the planet as well.

“We?re going to be able to reduce noise pollution, we?re going to reduce air pollution and we?re going to be able to reduce costs to taxpayers,” O?Malley said at event at Druid Hill Park in Baltimore City.

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