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I think you're parsing the sentence incorrectly. It is not "The 12th century is the only thing the 21st century will resemble." It's "There is nothing that the 21st century will resemble more than the 12th century." It doesn't entail "exactly the same."

Ah, that makes more sense. Thanks. :-)

Still think he's overstating his case though.

The wording is a bit too strong, but I take it to mean that the 21st century most closely resembles the 12th. Not exactly the same, but most similar among centuries.

He doesnt really address the obvious retort it most resembles the 20th century.

Everything old is new again! Including, like, horses pooping on muddy streets.

Greener than a Prius!

Yes, and the Black Plague killing off 25% of the world population from time to time...