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How the rise of copper reveals clean energy’s dark side

When “clean energy” relies on the extraction of metals like copper, it can also pollute the surrounding environment, and that leaves environmentalists in a pinch. ... Read more»

Sion Power

German chemical giant invests $50 million in Tucson battery maker

A German chemical company has invested $50 million in Tucson-based Sion Power Corp., a manufacturer of lithium-sulfur batteries.... Read more»