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>trivial replacement in renewable biofuels That's basically direct air capture with extra steps. All the carbon in those biofuels is coming from somewhere (the

• cyberax 2y ago
  Yeah, but you basically are using self-replicating solar-powered machinery (aka "plants") to capture it.
• rtpg 2y ago
  Maybe I'm just stupid but if all the planes in the world used biofuels, wouldn't that mean that flying is net-zero carbon (at least as it comes to fuel consumption)? Like you do your flying, release CO2, but that CO2 gets captured again... I mean that doesn't sound bad, right? It's not going to reduce the level of CO2 in the air right now, but it would stop further increases... which, mathematically, seems to be the same thing as if we kept the status quo and did something else to reduce CO2 output? What am I missing?
• mapt 2y ago
  Yeah. Except it isn't so unbelievably terrible on both capex and opex as mechanical DAC.