No that was cromagna mans fault. Cooking too much dinosauir ribs, and mammoth mountains oysters. All those wood fires got out of control burned major areas of giant redwoods. All the biofuel caused global warming, ice caps melted, etc... When things equalized, the ice caps reformed, repeat, rinse and dry.
See it's really all mans fault.
Or, that's a lie about the several ice ages. The workld is only 10,000 years old, so the scientists are full of crap, saying that there ever was an ice age.