雅思阅读

📖 Reading Passage

The concept of 'environmental carrying capacity' refers to the maximum population size of a species that an ecosystem can sustain indefinitely, given the available resources, habitat space, and prevailing environmental conditions. In ecological research, this concept is often applied to human populations, where it becomes a contentious issue. Proponents of strict limits argue that unchecked consumption and technological optimism have led to overshoot, where demand exceeds the planet's regenerative capacity. Conversely, critics contend that carrying capacity is not fixed; human ingenuity, trade, and technological advances can effectively raise the ceiling by substituting resources and improving efficiency. This debate underscores the difficulty of predicting long-term sustainability, as it hinges on dynamic interactions between natural systems and socio-economic behaviors, rather than simple arithmetic of population versus food supply.