Awakening

The last great climate upheaval came at the time of the freezing of the last ice age.
As people await the onset of the next ice age, climate change has over a period of hundreds of years brought about changes no one could have predicted - warming, a change in the oceans, the loss of the bottom end of the food chain, disease, migrations on a vast scale, the erosion of law and order, and finally, diseases that have ravaged a weakened population on a Biblical scale.
Added to the dystopian reality of global warming and acidic seas somewhere along the line, humanity has lost its ability to regenerate itself. With a rapid decline in the number of successful conceptions, until, before we know it, the day arrives when mankind realizes there are no more new children to be born into the decaying world and those who have the answers why are keeping to themselves.
Kate has left a legacy from the past. Only, she doesn't it yet, since she has yet to discover herself still in love with the man from a past she can never return to. In that past lies the answers to the predicament of the present, in the ash and rubble of a war that was never meant to have happened.

In the first book in the series, Awakening, Kate is forced to face the pains of discovering who she is in a world very different than the one she knew, though she still knows who she is three centuries into the future of the one she was a part of. The world she enters is one where sea levels are reduced, the vapor trapped in ice sheets at the polar caps, while the rest of the world bakes in a dust bowl.