We have tried to explain much of what we know about humans, including the evolution and extinction of Neanderthals and the Denisovans (a newly discovered group from Siberia), as well as how they interbred with the earliest modern populations who had just left Africa. All these phenomena have been put into the context of how animals and plants react to climate change. We're thinking about humans from the perspective of what we know about other species."
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Dr Stewart continued: "Ultimately, this model explains why Homo sapiens as a species are here and the archaic humans are not."
The research also leads to interesting conclusions as to how and why Neanderthals, and indeed the Denisovans, evolved in the first place.
Was Human Evolution Caused by Climate Change?