Too late to edit, but I should qualify this:

They claim 4000 tons per year, I did the math on 4000 tons per day. So ~3-4 acres of PV to power, not 1000 acres.

To completely counteract the 37 billion tons per year produced worldwide, and do it with PV only, assuming desert southwest conditions, would require ~30 million acres of PV. That sounds impossibly high, but is only about the size of the US state of Mississippi. 20% of the land area of Texas, on the El Paso side, would be sufficient to keep pace with the entire world's carbon dioxide emissions.

I remain skeptical that this is the most cost-effective approach, as well as skeptical of its ability to scale, but I apologize for crapping on it at first gloss.