Clean Energy Fuels Corp. (Nasdaq: CLNE) announced the opening of two new fueling stations that offer heavy-duty truck and other fleet vehicles renewable natural gas (RNG), one of the only fuels that receives a carbon-negative rating. A station in North Fort Worth, near Alliance and DFW airports, and another in South Dallas close to I-45, I-35 and I-20, are strategically located near dozens of distribution centers and allow trucks to take advantage of a fuel that provides similar convenience as diesel, yet is rated as one of the cleanest in the world.