Biofuels and e-fuels, electricity and hydrogen, mandates and tax credits-these and other options on the table risk overwhelming policymakers being pressed to provide government support to help aviation become sustainable. just the limitations of technology but also the cleanliness of the electrical grid used to recharge batteries or produce green hydrogen. "There's almost this belief that, when you say 'electricity' or 'hydrogen,' those are already green," says Chris able-energy grid, Cascade predicts global emissions will drop just 2.5. "Not a lot, but it helps," Raymond says. Now assume a hydrogen-powered regional. With today's gray hydrogen, emissions get worse. "What if the hydrogen were blue? There's a crossover point. As it gets closer to cleanly produced green hydrogen, it starts to help," he says.
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