![Earthling's "Space Slug Bad Touch" Is Destined For Cult Status](http://cache-07.gawkerassets.com/assets/images/8/2010/03/126x100_earthling-poster.jpg "Earthling's "Space Slug Bad Touch" Is Destined For Cult Status")
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As cool as these ideas seem in anime and colonies on hostile planets, I'd think that a roaming city would be somewhat devastating to the local ecology. Just a pack of roaming goats is enough to strip grass, increase erosion, sterilize the land, etc etc, imagine the trail (literally) of devastation a roaming city would create. Plus, giant trails of poop. Unless the technology to recycle human poop was also integrated into the city.
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