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On thinking about the other answers, I'm not sure this is possible without a little "something extra"... If humans suddenly die out, nature is likely going to reclaim most of our stuff more quickly...
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#1: Attribution notice removed
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System
·
2020-12-01T17:59:15Z (about 4 years ago)
Source: https://worldbuilding.stackexchange.com/a/176616 License name: CC BY-SA 4.0 License URL: https://creativecommons.org/licenses/by-sa/4.0/