Ozone depletion: causes, impacts and management
Identify the syllabus link between CFCs and ozone depletion, explain its listed impacts and evaluate international and local management strategies.
This original StudyForA sequence supports Cambridge IGCSE Environmental Management 0680 Topics 1–4 for exams in 2027, 2028 and 2029. Named local examples are chosen by the learner and centre; verify current conditions and local context with reliable sources. It is not a Cambridge paper, official grade or complete course.
Before you begin
- Use the 2027–2029 syllabus and check your exam year and centre's entry arrangements. Topics 1–4 are taught on this page; Topics 5–7 are still being built.
Work on paper. Try each question before revealing help, and explain why your method works.
Quick readiness check
Which is a listed impact of ozone depletion?
What you will learn
- Identify the syllabus link between CFCs and ozone depletion, explain its listed impacts and evaluate international and local management strategies.
- Use evidence from an unfamiliar case to compare options and justify a context-sensitive judgement.
Identify the named cause
The syllabus states that chlorofluorocarbons (CFCs) in aerosols and refrigerants cause ozone depletion in the ozone layer.
Keep this issue distinct from climate change and acid rain: each has different substances, mechanisms and management strategies in the syllabus.
Explain the listed impacts
Ozone depletion allows higher levels of solar radiation to reach Earth's surface. The syllabus lists increased rates of cancer and cataracts and damage to vegetation, resulting in reduced crop yields.
Describe these as potential impacts associated with higher surface radiation rather than claiming that every person or plant experiences the same outcome.
Evaluate management strategies
Strategies include international agreements and policies, a ban on CFCs and alternatives to CFCs, and safe disposal of CFCs.
Discuss how cooperation, compliance, replacement availability, costs and safe handling affect results. A ban on new use does not safely remove CFCs already stored in old equipment.
Sources for this lesson
Pause and explain
Why is safe disposal important?
Worked example
A town is replacing old refrigeration systems and still uses some aerosol products containing CFCs. Explain the problem and recommend measures that address both current use and stored CFCs.
Show the worked solution
- CFCs in aerosols and refrigerants are identified by the syllabus as a cause of ozone depletion.
- Ozone depletion can raise solar radiation reaching Earth's surface and is linked to cancer, cataracts and vegetation damage that may reduce crop yields.
- CFC alternatives and a ban can reduce new use; international policies and safe disposal are needed to manage use and CFCs in old equipment.
Answer Use alternatives and restrictions to reduce new CFC use, while safe disposal prevents stored refrigerants from being released. International cooperation supports consistent action.
Try a topic test
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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.
Explain the chain from CFC-containing refrigerant to one human impact and one agricultural impact named in the syllabus.
Give me a hint
Keep the cause, ozone-layer change and surface effects in order.
Compare my reasoning
- CFCs in refrigerants are a cause of ozone depletion in the ozone layer.
- Depletion allows higher levels of solar radiation to reach Earth's surface.
- The syllabus links this to increased cancer and cataracts and to vegetation damage that can reduce crop yields.
CFCs contribute to ozone depletion, allowing more solar radiation to reach the surface. Listed impacts include higher cancer and cataract rates and vegetation damage with lower crop yields.
Look for these in your work
- CFC source stated
- Radiation pathway complete
- Both impact types linked
Compare a CFC ban, an alternative refrigerant and safe disposal of old equipment. Explain what each addresses and one limitation or implementation need.
Give me a hint
Separate preventing new demand from preventing releases of CFCs already in use.
Compare my reasoning
- A ban can restrict new CFC use, but requires compliance and suitable replacements.
- Alternatives can replace CFC-containing products, but availability, cost and safe performance matter.
- Safe disposal prevents stored refrigerants being released when old equipment is removed, but requires trained handling and appropriate facilities.
The strategies address new use, replacement and existing stocks. They work together but need alternatives, enforcement and safe handling capacity.
Look for these in your work
- Three roles distinguished
- Existing stock addressed
- Implementation limits included
An international agreement reduces new CFC production, but old refrigerators are still discarded informally. Recommend two follow-up actions and measures of progress.
Give me a hint
Pair replacement and end-of-life handling with compliance and outcome measures.
Compare my reasoning
- Provide accessible CFC alternatives and a transition plan for remaining equipment.
- Create collection and safe-disposal systems for refrigerants, with trained handlers and enforcement against releases.
- Track CFC use and recovered or safely disposed refrigerant, and monitor relevant ozone and surface-radiation evidence over time.
The agreement needs local alternatives, collection and safe disposal. Progress can be tracked through use and recovery records plus long-term atmospheric and radiation monitoring.
Look for these in your work
- Two follow-up actions proposed
- Safe handling included
- Implementation and outcome measures separated
Common mistakes
- Confusing CFCs with the greenhouse gases listed for climate change
- Claiming ozone depletion is the only cause of climate change
- Ignoring safe disposal of CFCs in old equipment
- Stating that a policy instantly repairs all ozone damage
What can you explain now?
Which products are named as sources of CFCs?
Compare with the explanation
Aerosols and refrigerants
The correct answer is “Aerosols and refrigerants”. The alternatives “Catalytic converters and flood defences” and “Rice fields and manure” do not match the syllabus concept. Identify the syllabus link between CFCs and ozone depletion, explain its listed impacts and evaluate international and local management strategies.
After trying it yourself, choose your next review. This is your self-assessment.
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Make it stick
State the CFC cause, connect ozone depletion to its listed impacts and evaluate a package of management strategies.
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.