“Betting on a new way to make concrete that doesn’t pollute”

“Just after sunrise, a concrete plant located in a muddy industrial zone north of London stirs to life. Workers in orange suits and hard hats watch through a protective window as a machine presses what looks like red sand into a tray of brick-shaped blocks. Further along the line, other workers carefully measure these ruddy-colored blocks, pitch rejects into bins, and then adjust the machinery to correct errors.”

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