In a May 17 statement, Boeing said cutting carbon emissions in aviation depends on “the overall energy transition”, with sustainable aviation fuel (SAF) likely to be the aviation industry’s main contribution. Electric and hydrogen-fuelled aircraft face “long time-frames for development”, meaning their contributions to the “net zero” goal “will likely be limited,” the aerospace business said. “Our industry has really hard questions ahead of us, we’re going to have to make difficult choices,” said Neil Titchener,  Cascade programme leader. Boeing’s statement came as it announced it had made its Cascade tool available or public use on its Sustainable Aerospace Together

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