Overall Paper Difficulty & Verdict
The May 2023 Environmental Systems and Societies (ESS) SL Paper 2 is a classic, balanced exam representing a moderate difficulty (3 stars out of 5). Section A challenges students with diverse data-response materials, ranging from species extinction graphs to stratospheric ozone projections and water cycle systems. Section B contains accessible but highly discriminatory 9-mark essay questions that require excellent command of Environmental Value Systems (EVSs), specific case studies, and structured evaluations.
Where the Marks Are Won
In Section A, high-scoring candidates secured quick, easy marks on direct graph-reading tasks (such as identifying coral-reef vulnerability and reading ozone levels). However, the real differentiator lay in the short-explanation questions (e.g., explaining positive feedback loops of deforestation or evaluating reforestation as a climate mitigation strategy). In Section B, students who consistently defined key terms (like GPP, NPP, MSY) in their 4-mark and 7-mark openers, and systematically organized their 9-mark responses with a clear introduction, comparative arguments, and an evaluative conclusion, easily reached the top mark bands (7–9 marks).
Common Pitfalls & Examiner Insights
Several common errors were flagged in the examiner reports:
- Vague pollution references: Writing 'pollution' or 'human impact' without specifying the exact pollutant (e.g., agricultural run-off, acid deposition, or specific greenhouse gases) cost many students vital marks.
- Confusion in Feedback Loops: In positive feedback questions, students often struggle to close the loop or mistakenly describe negative feedback mechanisms.
- Incomplete Essay Evaluations: In 9-mark questions, many candidates listed facts without linking them directly to the prompt or failed to supply a balanced conclusion.
Preparation and Strategy
For future series, students must master the art of the 9-mark essay. This includes committing named, specific regional examples to memory (such as contrasting wild fisheries with particular aquaculture operations, or naming specific societies and their energy choices). Ensure that command terms like Evaluate and Compare and Contrast are answered with structural balance (presenting both sides before forming a clear, evidence-based judgment).
Future Predictions
Given the heavy emphasis on stratospheric ozone and general biodiversity statistics in this paper, future exams are highly likely to pivot back to water pollution/eutrophication, resource conservation strategies, and detailed climate change mitigation/adaptation techniques. Success will depend on your ability to synthesize ecology with social and economic realities.