A few of my working notes on direct air carbon capture (DAC), and the implications for climate change: http://cognitivemedium.com/dac-notes
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Yeah, people mix up "Is it _possible_ to solve?" with "And what's the best possible / most realistic approach?" They can't answer (b), which is a much more complex question, so get pessimistic about (a). Hard to get ppl out of this mindset.
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Have you looked in much depth into Herzog's analysis? It's much more pessimistic on the thermodynamics than Lackner. I must admit, I think it's probably just wrong (trees seem to be a cheap way of doing DAC, thermodynamically), but there's a lot of details.
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