The latest wired - a 10th anniversary issue seems to be flooding with old-style futurism. They're even bringing out that chestnut: Underground cities.

Having lived near Toronto I can testify to the fact (mentioned in the article) that this is already a reality there, which makes a lot of sense when it is unbearably cold on the upside.

There's only one little problem: Sunlight is still a much, much better source of light than any artificial source (in fact, here in Denmark it is illegal for a company to put their employees in offices without access to natural light) so either we have to dispense with that particular quality of life or somebody has to develop a good full-spectrum light source or these cities underground must be built with some kind of sunlight distribution system. Think parabolic ray collectors and fiber optic conduits - or maybe a collector up top and then a shaft with almost transparent mirrors reflecting low percentages of the intense light collected at every sub surface living layer it passes.

Another interesting thing about this is that real estate will become a three-dimensional, not a two-dimensional property. As far as I understand in Tokyo this is already the case. Due to the inflated prices of the eighties, legislation was passed limiting the right of property to some level underground, so that subways and other utilities could still be built during the boom.