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Public transportation systems are a key air quality and climate change issue. About a third of Maryland's total greenhouse gas emissions come from the transportation sector. Public transportation uses at least half as much energy to move a single person as a private vehicle, and one study found that replacing private vehicle trips with public transit trips reduces carbon monoxide by 95%, volatile organic compounds by 90%, and carbon dioxide and nitrogen oxide by 45%. Robust public transit systems allow commuters and travelers to get out of their cars, reduce demand for parking, help cities