Which Country Is More Eco-Friendly? Comparing Evidence in IB ESS

02 Aug Which Country Is More Eco-Friendly? Comparing Evidence in IB ESS

There is no single measure that proves a country is “the most eco-friendly” in every respect. For IB ESS, this question is a useful way to practise comparing evidence: define the environmental issue, choose an appropriate indicator and explain what the data can and cannot show.

State the index and the year

The earlier version of this article described Denmark, the United Kingdom and Finland using the 2022 Environmental Performance Index (EPI). Those positions should not be presented as a permanent ranking.

For a clearly dated example, the 2024 EPI results placed Estonia first and Denmark tenth. This illustrates why a claim needs an edition and a source. It does not establish that every environmental outcome in Estonia was better than every outcome in Denmark.

Choose indicators that match your question

• Climate: decide whether you are comparing total emissions, emissions per person or a change over time.
• Air quality: use a specified pollutant and an appropriate measure of exposure or concentration.
• Biodiversity: distinguish the area designated for protection from evidence about habitat condition or species populations.
• Water: identify whether the data describe drinking-water access, water quality, wastewater treatment or water stress.

These indicators answer different questions. A country can perform well on one and face substantial problems on another. An overall index combines selected measures; it cannot replace examining the issue you are discussing.

Explain the limits of a country ranking

Read the EPI methodology alongside its results. The selection of indicators, targets and weighting affects the overall score. Changes in data or methodology can also affect comparisons between editions.

Consider scale and context. A national average can hide differences between communities. A comparison based on emissions produced within national borders addresses a different question from one that considers emissions associated with consumption and imported goods. State the boundary used by your source.

A worked ESS comparison

Imagine that Country A has lower annual emissions per person than Country B, while Country B has a larger proportion of electricity generated from renewable sources. These are hypothetical observations, not actual country data.

You could conclude that A performs better on the emissions indicator used, but you could not conclude that A performs better on every aspect of sustainability. To explain the difference, you would need further evidence about energy demand, industry, transport and the measures used. A high renewable-electricity share also says little by itself about fuels used outside electricity generation.

Practise a balanced conclusion

Try this original practice task: “Explain why one environmental indicator is insufficient to identify the most sustainable country.” Build your answer around two contrasting indicators and one limitation of the data. Finish with a judgment tied to the evidence.

For related practice, read three sustainable choices and how to evaluate them. If comparing evidence or writing a conclusion is difficult, explore online ESS tutoring for SL and HL or request a free 20-minute trial lesson with Marija Maletz.