Role of Climate Change in Human Evolution

Plant and animal distributions and evolution have been influenced by climate change throughout Earth's history, so isn't is plausible that climate change influenced the evolution of humans as well? Climate shifts cause the migration of plants and animals, and primitive humans relied on many plants and animals for food and materials. Humans will go where the food and materials are and the underlying cause of plant and animal migration is climate change. Scientists hypothesize that early human migrations caused interbreeding events between modern humans, Neanderthals, and Denisovans. http://www.sciencedaily.com/releases/2012/03/120315152514.htm