CNN (@CNN) “Today, only around 1% of the Earth’s surface is urbanized and it wouldn’t take l” — TopicDigg
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加入 February 2007
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Today, only around 1% of the Earth’s surface is urbanized and it wouldn’t take long for what we’ve built to be erased. The further back in time a hypothetical civilization existed, the harder it would be to find direct evidence, like objects.
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