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@accretionist on cost: "So 80% of the total installed cost of concrete is labor, and it's often unionized labor.

The cement is 10% of that, and the aggregate is the remaining 10% so even if we were to charge a two to four x green premium, really, it doesn't really affect the overall cost of a building that much."

from https://www.volts.wtf/p/we-are-closing-in-on-zero-carbon. Really interesting read, actually.