Hydrogen-Powered Airplanes Face 5 Big Challenges
Hydrogen could help make flying greener, but switching away from fossil fuels poses some hefty challenges
![Hydrogen-Powered Airplanes Face 5 Big Challenges](https://static.scientificamerican.com/dam/m/3035f6b18d326d94/original/JJ5BF1.jpg?w=1200)
Hydrogen could help make flying greener, but switching away from fossil fuels poses some hefty challenges
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