Fool.com analysts Austin Smith and Jason Moser talk about three reasons to buy shares of Clean Energy Fuels (NASDAQ: CLNE). The company provides solutions for vehicles to use natural gas as an alternative fuel, part of the movement toward widespread natural gas adoption that is picking up steam. With the trucking industry embracing Clean Energy's technology, and with state governments showing interest in converting their fleets to use natural gas, the company has tremendous potential to earn positive returns for its shareholders. T. Boone Pickens and CEO Andrew Littlefair are phenomenal leaders at Clean Energy Fuels, and the company is expected to have further success as it develops a seamless network of fueling stations across the country -- America's National Gas Highway.