According to a paper published in Science, models of how animal and plant distributions are affected by climate change may also explain aspects of human evolution. This approach takes existing knowledge of the geographical spread of other species through the warming and cooling of the ice ages to provide a model that can be applied to human origins. Climate is believed to be the driving force behind most of these evolutionary processes, including geographical range change. It dictates which species are where at what time, driving their geographical spread or contraction. The research leads to interesting conclusion as to how and why Neanderthals, and indeed the Denisovans, evolved in the first place.
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