this post was submitted on 10 Aug 2023
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346
Hydrogen-powered planes almost ready for takeoff (arstechnica.com)
submitted 2 years ago by [email protected] to c/[email protected]
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[–] [email protected] 9 points 2 years ago* (last edited 2 years ago)

Last time I checked, CO2 released at that altitude has 3x the effect on radiative forcing, so it's good that we're not dumping it up there. I know water is also a greenhouse gas, but I expect the residence time to be substantially lower than for CO2. So it would be a net positive as long as we're emitting on the ground the same amount of CO2 as emitted up there (we're probably emitting more, but probably not 3x more and it would be easier to capture at the exhaust than from up there)

PS: more on radiative forcing factors here https://sustainable.stanford.edu/sites/g/files/sbiybj26701/files/media/file/s3-radiative-forcing-rfi-memo_public.pdf