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Copper prices have a message for the world: expect to make a lot of wind farms, wires, electric cars and other staples of the green economy. Prices of the tawny metal pushed above $7,000 per tonne this week, the highest since 2013. It was a sign not only that the economy is revving back up — …
AJ ! flipped this story into CONCEPT ! SPACE ! TECH . . .•1218d