New study raises questions about sustainability of metal resources

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This image shows copper in ore. The penny was once composed mainly of copper but since 1982 the United States Mint has made pennies from copper-plated zinc. Credit: USGS
This image shows copper in ore. The penny was once composed mainly of copper, but since 1982 the United States Mint has made pennies from copper-plated zinc. Credit: USGS

Researchers studying supplies of copper, zinc and other metals have determined that these finite resources, even if recycled, may not meet the needs of the global population forever. According to the study, if all nations were to use the same services enjoyed in developed nations, even the full extraction of metals from the Earth's crust and extensive recycling programs may not meet future demand.


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