Source 120: The following quote is from the BBC news article ‘How are humans going to become extinct?’; accessed Jul. 2013 at: http://www.bbc.co.uk/news/business-22002530. This link may or may not still be operational; if it isn't, we may have redirected it to the WayBackMachine archive.

‘“This is the first century in the world’s history when the biggest threat is from humanity,” says Lord Rees.’

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