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Late to the party but... we don't need fossil fuels to launch rockets.

Aside from synthetic fuels, you can launch rockets on methane. Can't make methane? (You are a robot society by now, because it would mean there is no biosphere anymore). Still fine! We can convert our oceans into fuel (hydrogen + oxygen), given energy input. Energy can come from renewables, nuclear, etc.

No, we are not going to run out of fuel for as long as we have water.




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