150415_nyt_bluebird_168.jpg | Kevin D. Liles Photography

Propane-powered buses are parked at the Bibb County Board of Education Transportation Department, where buses are maintained and refueled, photographed on Wednesday, April 15, 2015 in Macon, Ga. Photo by Kevin Liles for The New York Times Photo by Kevin Liles for The New York Times

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Copyright: Kevin Liles
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Propane-powered buses are parked at the Bibb County Board of Education Transportation Department, where buses are maintained and refueled, photographed on Wednesday, April 15, 2015 in Macon, Ga. Photo by Kevin Liles for The New York Times Photo by Kevin Liles for The New York Times