When most of us think of what humans will leave behind when we go, we imagine skeleton buildings or toxic landfills. But according to some geologists, the longest-lasting impact we'll have on Earth is actually beneath our feet—in the form millions of tunnels, deep boreholes, and mines.
via Gizmodo http://ift.tt/1s8T2J5 http://ift.tt/1s8SNNW
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