Human evolution was not solely caused by climate change. While climatic factors may have played a role, it is important to consider the complex interplay of genetic, ecological, and environmental factors that shaped human evolution over millions of years. Evolution is driven by various processes, including natural selection, genetic variation, and adaptation to changing environments. Genetic alterations, such as mutations, played a significant role in the evolution of human traits. It's a multifaceted process influenced by multiple factors working in conjunction over time.