雅思阅读

📖 Reading Passage

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, contemporary researchers argue that technological innovation and trade can temporarily raise a region's carrying capacity. However, this expansion often leads to a 'rebound effect', where increased efficiency in resource use paradoxically accelerates overall consumption. A 2019 study by Liu et al. demonstrated that in coastal urban areas, despite improved water recycling technologies, total freshwater demand rose by 12% over a decade, driven by population growth and higher per-capita consumption. This suggests that technological fixes alone are insufficient without corresponding shifts in consumption patterns and policy frameworks. Thus, sustainable management must integrate ecological thresholds with socio-economic drivers, recognizing that human systems are not merely passive recipients of environmental constraints but active modifiers of them.