What chemical limitation do hydrocarbon-based biofuels still face despite their lifecycle carbon neutrality claim?
Answer
If hydrocarbon-based, they will still produce $ ext{CO}_2$ and potentially soot when combusted.
While biofuels might be marketed as carbon-neutral based on lifecycle capture, if the biofuel itself is hydrocarbon-based, its combustion within the rocket engine will still result in the release of $ ext{CO}_2$ and potentially soot.
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