much better to make methane and ru vehicles on that

how much energy does it cost to produce concentrated NaOH ?
It looks to me this is a very expensive and energy-intensive way of carbon sequestration.
Though, if it would somehow be feasible to produce NaOH energetically efficiently enough for carbon sequestration, you could even just spray it onto the ocean to sequester CO2 in the oceans. after all, every molecule of NaOH sequesters one molecule of CO2. Since the CO2 in the surface-water of the ocean is in dynamic equilibrium with the atmosphere, lowering CO2 in ocean water (by causing NaOH + CO2 --> NaHCO3) will immediately induce oceanic absorption of atmospheric CO2.
Sadly, I think producing that NaOH with conventional technologies, will produce almost as much CO2 than could be sequesterd with it. (as long as you don't go nuclear).
I suppose this method of carbon sequestration is an intermediate for proof-of-concept and in the final version, other, more energy efficient, methods will be used for separating H2 and CO2.
I hope I am wrong on this ; if NaOH could be produced efficiently, it would provide a lot of easy posibilities for massive carbon sequestration.

"you could even just spray it onto the ocean to sequester CO2 in the oceans. "

Ummm, spray our oceans with sodium hydroxide... to lower a naturally occurring gas that comprises .0378 (three one hundredths of one percent) of our atmosphere?

BTW, sodium hydroxide is OSHA rated as a hazardous toxic chemical fatal if ingested, causing burns on contact.
http://www.camd.lsu.edu/msds/s/sodium_hydroxide.htm#Toxicity

Just wondering, what universe do you hail from?

Agreed. CO2 and bicarbonate are in equilibrium at the ocean surface already, and a little NaOH won't make a bit of difference. I haven't followed the links, but I'm guessing that they recycle the NaOH by cooking off the CO2 as is typical in hydroxide capture strategies, although I believe that CaO is much more useful because the calcium carbonate is less soluble in water than sodium bicarb.