[Retric]

A lot of CO2 has been released.

10 Trillion metric tons / 7.8 billion people ~= 1,300 tons per person which is well beyond the amount of building materials used.

[TeMPOraL]

Yup, but the point is that with such magic building material, we could not only build buildings and facilities with it, we could just pile heaps of it above ground for the purpose of only sequestering carbon.

[bryanlarsen]

That's about 130 trees or 13 houses. Yes, that's well beyond the amount of building materials used, but not unimaginatively so.

[lostapathy]

How much pavement exists per-capita? I'm sure that would lower the multiplier a lot too.