Humans to become a 'predominantly urban species'.

"London, some 200 years ago, became the first city since ancient Rome to reach a million inhabitants: now, there are more than 200 such cities. About 20 of theseare "megacities" exceeding 10 million, and one, Tokyo, has become a "metacity", with more than 20 million. Reports by Washington's Worldwatch Institute, published next month, and by the UN Population Fund, due in the summer, will describe the imminent transition and grapple with how to cope with the rapidly swelling cities." LINK