World's first test run of a hydrogen jet engine a success

Rolls-Royce and European airline easyJet announced that they've successfully tested a hydrogen jet engine - technology the companies hope might eventually help erase aviation's greenhouse gas emissions. Aviation is considered one of the most difficult industries to clean up because it's much harder to make electric planes than electric vehicles. Batteries charged with renewable solar and wind energy are still too bulky for long flights. So airlines and plane manufacturers are working to develop planes that can run on cleaner fuels like hydrogen, which produces water vapor instead of carbon dioxide when burned. (TheVerge)

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