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Not sure where you're getting these figures. Here's an analysis which estimates CO2 emissions from Starship for E2E will be roughly similar to those from a 777
by eyesee 6y ago
Not sure where you're getting these figures. Here's an analysis which estimates CO2 emissions from Starship for E2E will be roughly similar to those from a 777 flight based on fuel consumption. Depending upon how the methane is generated it could be a carbon-neutral flight. This doesn't include support vehicles, but that would be quite speculative at this stage.
https://www.nextbigfuture.com/2019/12/spacex-rocket-emissions-similar-to-large-jets-crossing-the-oceans.html https://www.nextbigfuture.com/2019/12/spacex-rocket-emission...
- sandworm101 6y agoLook deeper at those numbers. Net fuel consumption/emissions is different than "rocket emissions". Rocket fuel isn't diesel. The emissions from the actual rocket in flight do not capture the total emissions generated in the creation/preparation/compression of rocket fuels. Some rockets produce literally zero carbon during flight (liquid hydrogen + liquid oxygen = water) but that doesn't mean plenty of coal/oil wasn't used in the creation of those fuels.
- m4rtink 6y agoYep - pushing air away for 12+ hours at high sub sonic speeds might indeed be less efficient than a sub orbital flight where you exit the atmosphere in a couple minutes and cover most of the distance without meaningful air resistance in the vacuum of space.