Xenozoic Xenozoic Tales
In the storyline, the Earth has been ravaged by pollution and natural disasters of all sorts. To escape this, humanity built vast underground cities in which they lived for approximately 600 years. Upon emerging, the humans found that the world had been reclaimed by previously extinct lifeforms (most spectacularly, dinosaurs). In the new 'Xenozoic' era, technology is extremely limited and those with mechanical skills command a great deal of respect and influence.