Thanks. The advantage of seawater extraction is that the carbon concentrations are ~140x those of the atmosphere by volume. Oh, and for those who are curious, freshwater
doesn't have the same concentrations -- this really is a seawater method, not a "water-based" method.
I'll look for information on the zeolite processes.
Of all places, the West Virginia Coal Association has a wealth of information on carbon sequestration research. I suspect it's because the industry's counting on this for its future lease on life.