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Amadeus Schmidt said:
In addition there's the problem than in reagions where animals were fat
(northern) in the ice ages *wood* has been very rare. The whole ice age
(glaciation eras) shows few trees due to the extreme dryness.
Ray's steppe/tundra (with the "herds") doesn't show trees, does it?

Rachel:
In Jean Auel's book, the potential loss of fat was dealt with in some cases
by cooking the animal, such as rabbit, with the skin on.   Also, people
burned dung, kindling, and dried shrubbery from many plants for fuel.   Auel
got some information from paleo anthropologists that suggests that people
may have rendered the animal fat in leather sacks hung over the fire and wet
first so they would not burn.  It is interesting the way she describes it.

Rachel