Climate-change impacts and linked environmental effects
Explain how climate change can affect oceans, ecosystems, people, weather, farming and food supply without assuming every place has the same outcome.
Section Paper 2 · Environmental Management in Context
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 impact is directly linked to increased atmospheric carbon dioxide?
What you will learn
- Explain how climate change can affect oceans, ecosystems, people, weather, farming and food supply without assuming every place has the same outcome.
- Three impacts traced
- Marine and terrestrial effects included
- Local evidence requirement stated
- Use evidence from an unfamiliar case to explain a cause-and-effect link and justify a suitable response.
Trace physical changes in land and ocean
The syllabus includes rising temperatures at Earth's surface and at the ocean surface. Melting ice sheets, glaciers and permafrost can contribute to sea-level rise.
Increased atmospheric carbon dioxide is linked to ocean acidification. These changes can affect coastal communities and habitats, but local exposure and vulnerability differ.
Connect ecosystem and human impacts
Climate change can disrupt food chains, change biodiversity and cause habitat loss. Humans and other animals may be forced to migrate when conditions or resources become unsuitable.
Extreme weather events may become more frequent and severe, with flooding and land loss, drought and wildfires. Outcomes can also include changed crop yields, pest outbreaks, invasive species and food shortages.
Explain impacts with a cause pathway
A useful explanation links a climate-related change to an environmental or social consequence: for example, sea-level rise can increase coastal flooding risk, while drought can reduce water available for crops.
Avoid presenting a possible impact as identical or certain everywhere. Use evidence about the location, time period, exposure and adaptation capacity when judging severity.
Sources for this lesson
Pause and explain
Which is a balanced statement about climate impacts?
Worked example
A coastal farming area faces rising sea levels, hotter ocean surface temperatures and changing rainfall. Explain three possible impacts and identify evidence needed to estimate local risk.
Show the worked solution
- Melting ice can contribute to sea-level rise, increasing coastal flooding or land-loss risk in exposed areas.
- Warmer ocean surfaces and increased carbon dioxide can affect marine conditions, including ocean acidification and food webs.
- Changing rainfall can alter crop yields or increase drought and flood risk; local elevation, rainfall records, crops and defences help estimate exposure.
Answer Possible impacts include coastal flooding and land loss, changes to marine ecosystems, and altered crop yields or extreme-weather risk. Local observations and exposure data are needed to judge severity.
Try a topic test
Choose Easy, Normal or Difficult. Save your answers and open worked review after finishing.
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.
Explain one pathway from melting land ice to a human impact, and one pathway from ocean acidification to an ecosystem impact.
Give me a hint
Connect each physical change to an exposed place, resource or food web.
Compare my reasoning
- Melting ice sheets, glaciers or permafrost can contribute to sea-level rise.
- Higher sea levels can increase flooding and land-loss risk for exposed coastal communities.
- Increased atmospheric carbon dioxide can acidify oceans, affecting organisms and disrupting marine food webs.
Melting ice can contribute to sea-level rise and coastal flooding risk. Ocean acidification can affect marine organisms and food webs.
Look for these in your work
- Ice-melt chain correct
- Human exposure linked
- Acidification and ecosystem pathway linked
A farming region reports more drought, new pest outbreaks and lower yields. Explain how these outcomes fit the syllabus and why the data alone do not prove the cause.
Give me a hint
Connect drought and pests to climate-change impacts, but consider other factors and evidence.
Compare my reasoning
- The syllabus includes drought, increased pest outbreaks and changes in crop yields among possible climate-change impacts.
- Drought can reduce crop water availability, while pests can damage plants and reduce harvests.
- A causal judgement needs longer-term climate, pest, crop and land-management evidence and comparison with other possible causes.
These are syllabus-listed possible impacts, with plausible pathways to crop loss. The observations alone do not establish causation; trends and other factors must be investigated.
Look for these in your work
- Three syllabus impacts identified
- Impact mechanisms explained
- Correlation and causation distinguished
Two coastal districts face similar sea-level trends, but one has wetlands, higher land and strong flood planning. Explain why their outcomes may differ and identify measures for a fair comparison.
Give me a hint
Separate the physical hazard from exposure and capacity to adapt.
Compare my reasoning
- Sea-level change is a hazard, but elevation and the position of homes affect exposure.
- Wetlands and flood planning may reduce some impacts or help communities adapt, although protection is not guaranteed.
- Compare consistent sea-level, flood, population and land-use data over the same period, noting differences in defences and vulnerability.
Similar sea-level trends can produce different outcomes because exposure and adaptation capacity differ. A fair comparison uses consistent data and records local land use and protection.
Look for these in your work
- Hazard and vulnerability separated
- Adaptation limits recognized
- Comparable evidence specified
Common mistakes
- Claiming climate change affects every location identically
- Saying sea-level rise is caused only by ocean warming and omitting melting ice
- Treating ocean acidification as the same as warming
- Listing food shortages without a plausible pathway
What can you explain now?
Which process can contribute to sea-level rise in this syllabus?
Compare with the explanation
Melting of ice sheets, glaciers and permafrost
The correct answer is “Melting of ice sheets, glaciers and permafrost”. The alternatives “Increased photosynthesis in all forests” and “Reduced use of fossil fuels” do not match the syllabus concept. Explain how climate change can affect oceans, ecosystems, people, weather, farming and food supply without assuming every place has the same outcome.
After trying it yourself, choose your next review. This is your self-assessment.
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Make it stick
Give examples of physical, ecosystem and human impacts of climate change, and explain why local evidence matters.
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.