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The needed concentration.

Do you honestly think they mean that we are physically running out of room on the planet to put roads?

In addition to the roads and parking lots land is utilized to mine raw materials for producing the machine and fuel or charge it.

Not really, the US is only 3 orders of magnitude away from being 100% paved over. https://answers.yahoo.com/question/index?qid=20070719230638A...