Jeff Sturgeon's Last Cities of Earth

 "World building aficionados will be eager for additional creative works set in this fascinating future."-Booklist 
2091-The Year the Earth Changed
As Yellowstone erupts, sending humankind into an extinction level event, countries, cities, the elite, and the privileged race to the skies in order to survive the coming ice age. As some scientists focus on floating cities, undersea colonies, and space exploration, others delve into the darkness of genetic modification and new evolutions of humanity.
It is now YE 210 and over two centuries have passed since the day that changed the world and many global trade routes have resumed. More and more floating cities have become connected and many wait to be re-discovered by brave airship captains and crews.  Dangers lurk in the skies as well as the ruins scattered around the world like half-forgotten memories of a time that has become myth.