What does the ecological footprint measure?

• A. Area of land and sea needed to sustain resource use and waste
• B. Biodiversity index
• C. Temperature change
• D. Water availability

Answer: (A)

The ecological footprint conveys how much productive land and sea area is needed to support a population’s resource use and to absorb the wastes it generates, using current technologies. It translates daily living into a demand on Earth’s biocapacity, expressed in global hectares, so you can compare how much of the planet is required versus how much is available. This is why the correct description is the area of land and sea needed to sustain resource use and waste. It isn’t about biodiversity, temperature, or water availability—those are separate measures: biodiversity looks at species variety, temperature tracks climate change, and water availability assesses how much water is accessible.