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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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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Not in detail. But in their abstract: "our analysis of *existing* gas separation systems suggests..." w/ Fig. 1 reproduced from 1998 paper. No mention of electrical swing adsorption, metal organic frameworks, biology. So... just an extrapolation assuming no major breakthroughs.
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