The ice age was the direct result of the hot oceans that remained after the Genesis flood. Warm water generates high precipitation, and the warmer the water, the higher the evaporation rises into the upper atmosphere, resulting in more cold storms reaching into the temperate zones.
James Nienhuis has written considerably on this.
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Living in the northeast like I do now, there is always an ice age for six months....then six months of road construction.
:)