A few of my working notes on direct air carbon capture (DAC), and the implications for climate change: http://cognitivemedium.com/dac-notes
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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Thanks, more or less my impression. They've published a bunch, and I suppose I should work through the most recent one in detail. I'm reminded of the people who asserted with great confidence 20 years ago various lower bounds on solar, all long since broken.
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