The concept of 'environmental determinism,' which posits that human activity is largely shaped by climatic and geographical conditions, dominated geographic thought in the early twentieth century. However, this theory faced significant criticism for oversimplifying the complex relationship between humans and their environment. Critics argued that it ignored the role of technological innovation and cultural adaptation, which allow societies to thrive in diverse or even harsh environments. By the mid-century, environmental determinism was largely replaced by 'possibilism,' a framework that acknowledges environmental constraints but emphasizes human agency and choice. Possibilism suggests that while the environment sets certain limits, it does not dictate the outcome; rather, human creativity and social structures determine how those limits are navigated. This shift reflected a broader move in social sciences toward more nuanced, interdisciplinary explanations of human development.