The concept of 'environmental carrying capacity' has long been central to ecological studies, yet its application to human societies remains contentious. While early models focused on biological limits, such as food production or water availability, contemporary scholars argue that technological innovation and trade can effectively expand a region's carrying capacity. However, this optimistic view is challenged by the 'rebound effect', where efficiency gains often lead to increased consumption rather than conservation. A recent study of urban water systems demonstrated that despite advanced recycling technologies, per capita demand continued to rise due to lifestyle changes. This suggests that carrying capacity is not a fixed threshold but a dynamic equilibrium shaped by social choices, economic structures, and cultural values. Consequently, policy interventions aimed solely at technological fixes may be insufficient without addressing underlying consumption patterns.