I read a book a long time ago about a dust cloud making its way through the solar system and diminishing sunlight enough to cause an ice age. Cities int he norther hemisphere have moved underground for generations. A young man and several others are expelled from their city and start a trek across the frozen world to see what has survived. The young man is a Judo Champion which serves him well in the adventures that follow.
I remember a great many things about the book, like herds of moose that survive by licking the algae that grows on the glaciers, but I cannot remember the name of the book.
Anyone recognize it?
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