Compare energy security and waste strategies
Evaluate reliable energy supplies and waste-management options using access, environmental impacts and long-term resource use.
Exam scope and assessment notes
Original StudyForA teaching and practice, not Cambridge-authored questions, mark schemes or official grades. Cambridge expects candidates to study all eight topics, carry out investigative work and learn teacher-selected case studies. This course does not replace a centre's named case-study examples, current local environmental data, supervised fieldwork or the candidate's own investigation. Practice datasets are illustrative, not observations from a real place. No official assessment or certification is provided. The examples and practice datasets in these lessons are fictional and formative; learners must add their centre's verified case studies and current local evidence.
Before you begin
- Cambridge recommends prior environmental/science study equivalent to IGCSE or O Level. This is an AS-only qualification; use the exam-year syllabus and confirm centre entry details.
Work on paper. Try each question before revealing help, and explain why your method works.
Quick readiness check
What makes environmental evidence useful?
What you will learn
- Explain energy security and pressures on supply
- Compare renewable and non-renewable energy options
- Evaluate waste-disposal impacts and management strategies
Energy security concerns reliable supply
Classify biofuels (wood, bioethanol and biogas), geothermal, hydroelectric, tidal, wave, solar and wind as renewable examples; coal, oil, natural gas and uranium-fuelled nuclear energy are non-renewable in the syllabus classification. Energy security means reliable energy at an affordable price while considering environmental impacts; short-term security responds to sudden supply-demand changes and long-term security supports economic and environmental needs.
Insecurity can result from fossil-fuel depletion, unequal global resource distribution, population growth, differing needs between income groups, climate change and disruptions such as natural disasters, piracy or terrorism. Effects can include power cuts, rising prices and industrial costs, job losses or recession, poverty and lower living standards, import dependence, civil disruption and conflict. Strategies include efficiency, increased production, reduced fossil-fuel dependence, renewable and carbon-neutral investment, alternative technologies, local projects and rationing. Compare reliability, cost, emissions, land, materials and waste.
Waste controls depend on material and pathway
The syllabus disposal and treatment methods include landfill, incineration, storage, disposal at sea, recycling and export. Impacts can include soil and groundwater contamination from leachate, methane build-up and explosion risk, visual and noise pollution, odour, disease, toxic releases, bioaccumulation, biomagnification and ocean plastics or microplastics.
Strategies include reduce, reuse and recycle; biodegradable plastics; using food waste as animal feed; composting; fermentation; energy recovery; education; incentives and legislation. Compare the material, collection, processing, transport, emissions and residuals: a strategy can move an impact rather than remove it.
Sources for this lesson
Pause and explain
Why assess waste strategy across a life cycle?
Worked example
A town considers a waste-to-energy plant. Identify benefits, risks and evidence needed.
Show the worked solution
- Compare disposal capacity and energy supply.
- Consider emissions, transport and recycling incentives.
- Name monitoring and life-cycle evidence.
Answer The plant may reduce some landfill demand and recover energy. It may emit pollutants, require long-distance transport or discourage waste prevention if contracts demand constant feedstock. Compare emissions, ash, transport, costs and recycling outcomes over its life.
Try a topic test
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Test this topic →From guided practice to a new situation
Write your answer and reasoning first. Use a hint only if you are stuck. The model solution is for self-checking; your written work is not automatically marked.
A region relies on imported gas and has seasonal peaks. Name two strategies and one trade-off for each.
Give me a hint
Combine supply diversity with demand or infrastructure action.
Compare my reasoning
- Identify the relevant data, place or process in the prompt.
- Apply explain energy security and pressures on supply to the stated context.
- Explain the inference and one limitation or trade-off.
Renewables can reduce dependence on one fuel but require storage and grid upgrades. Efficiency and demand management can lower peaks but require investment and participation. Compare reliability, cost and environmental effects.
Look for these in your work
- Explain energy security and pressures on supply
- Uses relevant evidence and explains the environmental mechanism
- Distinguishes observation, inference and limitation
A landfill creates methane and leachate risks. Compare one prevention and one management action.
Give me a hint
Prevent waste generation and control the site pathway.
Compare my reasoning
- Identify the relevant data, place or process in the prompt.
- Apply compare renewable and non-renewable energy options to the stated context.
- Explain the inference and one limitation or trade-off.
Reducing organic waste through prevention or separate collection limits landfill inputs. Gas capture and leachate collection control site impacts, but monitoring and treatment remain necessary. Assess measured emissions and water quality.
Look for these in your work
- Compare renewable and non-renewable energy options
- Uses relevant evidence and explains the environmental mechanism
- Distinguishes observation, inference and limitation
A city would replace recycling with incineration because it generates electricity. What should decision-makers compare?
Give me a hint
Compare waste hierarchy outcomes and full plant impacts.
Compare my reasoning
- Identify the relevant data, place or process in the prompt.
- Apply evaluate waste-disposal impacts and management strategies to the stated context.
- Explain the inference and one limitation or trade-off.
Compare prevention, reuse and recycling with net energy, emissions, transport, ash and costs. Check whether long-term contracts require waste volumes that weaken incentives to reduce or recycle.
Look for these in your work
- Evaluate waste-disposal impacts and management strategies
- Uses relevant evidence and explains the environmental mechanism
- Distinguishes observation, inference and limitation
Common mistakes
- Calling a renewable option impact-free
- Treating energy security as domestic production only
- Assuming waste-to-energy eliminates all waste impacts
What can you explain now?
Why assess waste strategy across a life cycle?
Compare with the explanation
Collection, transport, processing, emissions and residues all have effects
A strategy can shift an impact rather than remove it.
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Make it stick
How can a waste strategy shift environmental impacts rather than eliminate them?
If you needed the solution, close it and solve the problem again from a blank page. A correct answer is stronger when you can explain the reason for each step.