Setting aside CO₂ concerns for a moment, I was explaining cement to a young child today and was suddenly struck by how marvelous cement is: It’s poured as a liq

Setting aside CO₂ concerns for a moment, I was explaining cement to a young child today and was suddenly struck by how marvelous cement is: It’s poured as a liquid yet solidifies into rock, and has been known since ancient times [1]. [1]: https://en.wikipedia.org/wiki/Cement#History https://en.wikipedia.org/wiki/Cement#History