How much water vapor in the atmosphere is harmless? The emphasis here is on "in part" hydrogen powered.
"In a record trip for low-carbon aviation, a startup has completed a test flight [on 1/19/2023] of a 19-seat aircraft powered in part by hydrogen fuel cells. It’s the largest plane that ZeroAvia, a leader in developing hydrogen-electric systems for planes, has tested in the air to date.
The flight took off from Cotswold Airport in the UK and lasted about 10 minutes altogether. During the flight, the plane’s left engines were powered by a combination of hydrogen fuel cells and batteries, while the right side relied on the fossil fuel kerosene.
Aviation accounts for about 3% of global greenhouse gas emissions [only 3%????], and the industry is growing quickly. ..."
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