Airplanes are a minor contributor to global greenhouse-gas emissions, but their share is sure to grow as more people travel in coming years
Sustainable fuel is biofuel made from cooking oil, animal fats, municipal waste or other feedstocks. Its chief advantage is that it can blended with conventional fuel to power jet engines. It has been used many times on test flights and even regular flights with passengers on board.
Several companies are designing and starting to build electric-powered planes, but most are small aircraft that take off and land vertically, like helicopters, and they are about the same size — with room for only a few passengers. Despite that, Rutherford remains “cautiously optimistic” about hydrogen. His group believes that by 2035, there could be hydrogen-powered planes capable of flying about 2,100 miles . Others, however, see obstacles including the need for massive and expensive new infrastructure at airports to store hydrogen that has been chilled into liquid form.reached an agreement
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