[qznc]

There seems to be a force which makes humans disperse. We settle on every part of this planet even in uncomfortable regions. Some people want to settle on Mars. (Curiously, nobody wants to live on our moon?)

There also is a force which makes humans cluster. Silicon Valley is the biggest cluster of IT and VC at the moment. Accelerando (by Charles Stross) describes vividly how an advanced AI civilisation still clusters (Mainly because solar/fusion power and communication speed).