Comment by adrianmonk

This also produces carbon nanotubes, which they claim can be used in construction.

Given that construction currently uses a huge amount of concrete, and given that concrete emits huge amounts of CO2[1], if this could partially replace concrete in construction, it might actually be clean. At least compared to what we're doing now.

I doubt foundations are going to be made out of carbon nanotubes, but they might be useful for the structure (columns, beams, etc.).

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[1] "4-8% of total global CO2" according to https://en.wikipedia.org/wiki/Environmental_impact_of_concre...