Bryce talks mainly the cost of reducing power plant output to capture carbon and the large volume of carbon to be sequestered, with piping given a secondary billing. If we're going to sequester under the ocean (or misguidedly, into the ocean as Roger Pielke Jr appears to like), then piping would still be necessary for open-air capture. The volume problem for open air capture is the same as at the power plant, and the energy cost should be a lot higher to remove CO2 when is much less than 1% of the atmosphere compared to power plant exhaust which I think is in the range of 30-60%.
I don't have much in the way of numbers to critique Bryce and Adler, but they have even less.
In general, I was unimpressed with Bryce's article - coal is cheap, and adding substantially to its price might still be in the range of feasibility. Adler's thought that the argument supports open-air capture (an option I won't rule out, btw) is even less impressive.
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