Over time, there is a creep that occurs, such that from places where the climate has remained the same plants grow outward toward where they find conditions hospitable. The opportunists who took over, preempting all the strugglers, find they are being pushed, steadily, to assume their former status. Animals, being mobile, are less hard hit, and either adjust their day and night to the new conditions or travel. After a time, a few centuries, the Earth looks much as it did before, only this time with new poles, a new equator, and newly established temperate zones. All of this activity is modulated at first by the gloom cause by Volcanic Dust .
Strong sunlight occurs only occasionally, in certain locations.
In the main there is dusk, ever present dusk. Where there is vegetation die back, this is caused in fact more by the lack of sunshine than by any climatic changes. Animal life is impacted by the lack of food, too, more than climatic changes. However, after a couple decades, the skies clear, and then the climatic changes are the stronger determinant.