A publication in the Proceedings of the National Academy of Sciences by the IE group at Yale (led by Tom Graedel) has been picked up by science magazine. Excerpt:
There are about 150 kilograms of copper in current use for each person in North America. The researchers then multiplied the copper used per person by total world population, using standard population estimates to project into the future. By the mid-21st century, if everyone in the world used copper at North American rates, every scrap of known copper ore would be mined
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