Really freaky to read in when it is freezing out.
This is the story of climate change and it's power to alter the human race. As the world suffers from terrible heat and drought in some areas, terrible cold and ice devastate others. Colder and colder, the glacial ice flows take over North America, and large icebergs block the oceans. No where is safe, and man starts to turn away from civilation, the the primative goal of survival of the fittest.