G. David Felt Staff Writer Alternative Energy - www.CheersandGears.com   600 Mile, Single Charge, Proterra EV Buses! PROTERRA All-electric zero-emission that can finally replace all petro powered buses in North America was unveiled at the Annual APTA (American Public Transit Association) meeting in Los Angeles. Proterra which is known to have launched the first fleet of alternative fuel buses has pushed American engineering with over $130 million in private equity fund