Spanky The Dolphin wrote:Aya wrote:Earth has shitloads of colonies, how can Earth still be overpopulated?
Not to mention the fact that everybody died in World War III.
Simon: There's more to life than Lovecraft and Greys, you know...

There's more to life than making snide comments at people, you know.
"Everyone" dying in WWIII is anything but a "fact." Last time I checked, 600 million dead is 10% of today's population, never mind that in 50 years, or the population, you know, GROWING in the 300 years after WWIII to TNG.
While coloney worlds may reduce the population, a good number of colonies seen in ST aren't heavily populated, and Earth may be a more desirable place to live then starting a new life lightyears away, especially since it is concidered to be a paradise by most.
Of course, when we've seen Earth it doesn't look very crowded and it's easily possible the population has mostly stabilized (as with several 1st world countries today). Of course the population of Earth may have started to increase a lot during TNG causing them to seek out more room, but that's probably unlikely. This 'Atlantis' may be just for even more room which people always desire. Or, as people have suggested in this thread, the Federation may be trying to move people onto it in order to restore natural environments, which I can see them doing.