I have an idea! What if I start reconstructing from an iceage, take this as a starting point?

An iceage is common to follow on an apocalyps. This will take away most of the problem of rebounding lands in Greenland and Antarctica. Besides, the glaciers may carve out a cool landscape in Southern Africa and North America.
Once I have the glacial ocean currents and winds designed and have the surviving human and wild life regroup in some refuges, I can look for a positive feedback loop to break the iceage, have another climatic change into a more temperate interglacial as a second survival barrier and see what'll happen from there.
This way I'll have the first several thousand years worked out, add some history, some evolutionary challenges and the actual world (also in an interglacial) as an examplar.

Anywayz, I still have to draw the elevation map, so I'll get to that first
Oh I can't wait to start reconstructing the new glaciers.