Copper is in high demand. These startups aim to refine it in a cleaner way.

This story was first published by Grist . At a laboratory in Newark, New Jersey, a gray liquid swirls vigorously inside a reactor the size of a small watermelon. Here, scientists with the mining technology startup Still Bright are using a rare metal, vanadium, to extract a common one, copper, from ores that are…

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