Three years ago, Virgin Atlantic Airways grabbed some headlines when it experimentally ran one of its 747s on a mixture of standard jet fuel and biofuel. While some called it a publicity stunt, it was the first time that a commercial airliner had flown using biofuel – albeit only in part of one of its four fuel tanks. Today, however, the airline announced that it’s developing an aviation fuel that will have half the carbon footprint of conventional fuel. The carbon savings won’t result from how cleanly the fuel burns, but from how it’s obtained. Learn more here.