How much energy does it take to recombine the carbon dioxide though?

Didn't you watch the video?! Josh and Diane put down their briefcases and hold up tubes to a huge CO2 tank and the concrete mixer.

I assume they have trained other Josh and Diane's to do this work as well.

Its as simple as that!

it sounds interesting, but how much more does it cost? if the societal benefits are greater than the added cost it should be subsidized by the government

I think it should be paid for by co2 taxation. The cement makers free the co2, they should pay all costs to capture it again, not me. I'm not making profit from their co2 production, they are, so they should pay for the damages, that creates incentives for producers to not release it in the first place, government subsidies to recapture it without taxation on it's production do the opposite.

Shh, stop making sense or they'll send you to the "immigration" camps next.

I don't put a whole lot of faith in an ad for a company who's trying to sell a product. Who knows what this is all about and if it's worth a damn.

I think I'll hook a hose up from my exhaust to my gas tank. Simple, no?

Fucking Commie.

Anyone tell me why turning cement back into limestone, after going through all the bother of converting said limestone into cement, makes any sense whatsoever?

Sure, let's say you need a foundation. Wouldn't it be best if it were one solid stone? Now, isn't it easier to make that stone in place and in the right shape from an easily transported liquid instead of hauling in a 150 ton slab you have to then carve into shape?
Edit : this seems to turn the cement back into a single solid stone which should be far more stable and solid than regular cement/concrete.