It also depends on how the world ends up being without us. Factors such as nuclear bombs, acid rain or exotic stuff like nanotechnology that could potentially wipe out our species, won't be too kind to copper either.

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"I worry that, especially as the Millennium edges nearer, pseudo-science and superstition will seem year by year more tempting, the siren song of unreason more sonorous and attractive." - Carl Sagan, 1995