The concept of 'environmental footprint' has evolved significantly since its introduction in the 1990s. Initially, it focused solely on carbon emissions, but contemporary models incorporate a broader spectrum of ecological impacts, including water usage, land degradation, and biodiversity loss. This expansion reflects a growing recognition that environmental sustainability cannot be achieved by addressing greenhouse gases alone. For instance, intensive agriculture may have a relatively low carbon footprint yet cause substantial freshwater depletion and habitat destruction. Consequently, policymakers now advocate for a holistic assessment framework that integrates multiple indicators. However, critics argue that such comprehensive metrics often suffer from data unreliability and methodological inconsistencies, making cross-regional comparisons problematic. Despite these challenges, the trend toward multidimensional evaluation appears irreversible, driven by both scientific advances and public demand for transparent environmental accountability.
❓ What is the main idea of the passage?
A. A) Environmental footprint models have become more complex but face practical difficulties.
B. B) Carbon emissions are the most critical factor in measuring environmental impact.
C. C) Policymakers reject multidimensional assessments due to data issues.
D. D) Agricultural practices rarely affect biodiversity or water resources.
✅ 正确答案
A) Environmental footprint models have become more complex but face practical difficulties.
IELTS Reading Tips
Skim the questions first, underline keywords, then locate in the passage
Watch for paraphrasing; correct answers are often reworded
Be wary of absolute statements (all, always, never) — usually wrong
Pay attention to content after transition words (however, but, yet)
Manage time: about 20 minutes per passage; skip difficult questions first