Introduction
The concept of the ecological footprint is one of the most practical ways IB Environmental Systems and Societies (ESS) connects human activity to sustainability. In the 2026 first assessment, ecological footprints appear across multiple topics: population, resource use, energy choices, and sustainability.
This is a favorite exam topic because it combines data interpretation, calculations, and evaluation. Students who can explain and apply ecological footprints to real-world case studies often score higher in both Paper 1 and Paper 2.
Quick Start Checklist for ESS Students
When revising ecological footprints, make sure you can:
- Define the ecological footprint clearly.
- Explain how it is calculated.
- Compare ecological footprints between countries.
- Link ecological footprints to sustainability and carrying capacity.
- Use case studies in exam answers.
What Is an Ecological Footprint?
- The ecological footprint measures the area of land and water needed to provide the resources a population consumes and absorb its waste.
- Expressed in global hectares (gha) per person.
- Includes food, water, energy, waste, and carbon emissions.
How Ecological Footprints Are Tested
1. Definition Questions
You may be asked to define ecological footprint and link it to sustainability.
2. Calculation Questions
Simple data questions, e.g., calculating per capita footprint given resource use.
