How does climate change affect people, from farming and health to homes and livelihoods?
Describe the impacts of climate change on people and their activities
A focused answer to the O-Level Geography outcome on the human impacts of climate change. Effects on food and farming, water supply, health, homes and displacement, and the economy, and why poorer communities are most vulnerable, with a worked walkthrough.
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What this dot point is asking
SEAB wants you to describe the impacts of climate change on people and their activities. The central insight is that the physical changes, rising seas, extreme weather, shifting rainfall, translate into real consequences for human life: food, water, health, homes and livelihoods are all affected, and the burden falls unevenly, with poorer communities usually the most vulnerable.
The answer
Impacts on food and farming
Farming depends on a reliable climate, so it is highly exposed:
- More droughts and heatwaves reduce crop yields and can cause crop failure where rainfall becomes unreliable.
- Flooding and heavier rain can wash away crops and waterlog fields.
- Rising seas and saltwater intrusion ruin low-lying farmland and contaminate soil and irrigation water.
- Shifting climate zones can make traditional crops unsuitable, forcing farmers to change what they grow.
Falling harvests threaten food security and can raise food prices worldwide.
Impacts on water supply
Changes in rainfall and melting glaciers disrupt water:
- Droughts and dry spells cause water shortages for households, farms and industry.
- Shrinking glaciers reduce the dry-season meltwater that feeds major rivers and the people who depend on them.
Impacts on health
A warming climate harms health:
- Heatwaves cause heat stress, illness and death, especially among the elderly.
- Spreading diseases: warmer, wetter conditions can extend the range of mosquitoes carrying dengue and malaria.
- Floods contaminate water and spread waterborne disease.
Impacts on homes and displacement
- Coastal flooding and erosion damage homes, businesses and infrastructure.
- In severe cases, people are forced to leave permanently, becoming displaced (sometimes called climate refugees), losing land, livelihoods and community.
Why the impacts fall unevenly
Poorer communities and countries are usually more vulnerable: they have fewer resources to build defences, irrigate, insure or recover, often depend directly on climate-sensitive farming or fishing, and may live in more exposed places. Richer communities can invest in protection and technology, so they cope better, even though they often contributed more to the problem.
Examples in context
Example 1. Singapore's response to the human threat of sea-level rise. Recognising that rising seas threaten its homes, infrastructure and freshwater on a low-lying island, Singapore has committed major investment to coastal protection and treats climate adaptation as a matter of national survival. The concern is squarely about human impacts, protecting where people live and work, showing how even a wealthy state must plan for the consequences of a warming climate.
Example 2. Dhaka and the Ganges-Brahmaputra delta, Bangladesh. In the densely populated, low-lying delta of Bangladesh, more intense flooding, river erosion and rising seas with saltwater intrusion damage farmland and homes and drive people from the countryside toward cities like Dhaka. With widespread poverty and high exposure, the population is among the most vulnerable in the world, illustrating how climate impacts on food, homes and livelihoods can force large-scale displacement.
Try this
Q1. Describe one way climate change can reduce food production. [2 marks]
- Cue. More frequent droughts and heatwaves reduce crop yields or cause crop failure where rainfall becomes too low or unreliable; flooding and saltwater intrusion ruining farmland are also acceptable.
Q2. Explain why poorer communities are often more vulnerable to climate change. [2 marks]
- Cue. They have fewer resources to build defences, irrigate, insure or recover, often depend directly on climate-sensitive farming or fishing, and may live in more exposed locations, so they are less able to protect themselves and bounce back than richer communities.
Q3. Explain how rising sea levels can lead to people being displaced. [2 marks]
- Cue. Rising seas cause repeated coastal flooding, erosion and saltwater contamination of land and water that can make low-lying areas unlivable or unfarmable, eventually forcing residents to abandon their homes permanently and move elsewhere.
Exam-style practice questions
Practice questions written in the style of SEAB exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.
Original6 marks(a) Describe two ways climate change can affect food production. (b) Explain why poorer communities are often more vulnerable to the impacts of climate change than richer ones.Show worked answer →
(a) Two ways: first, more frequent droughts and heatwaves reduce crop yields and can cause crop failure where rainfall becomes unreliable or too low. Second, rising sea levels and saltwater intrusion can ruin low-lying farmland and contaminate soil and irrigation water, while flooding from heavier rains can wash away crops. Shifting climate zones can also make traditional crops unsuitable.
(b) Poorer communities are more vulnerable because they have fewer resources to cope and adapt: they often cannot afford sea walls, irrigation, insurance or air conditioning, may depend directly on farming or fishing that climate change disrupts, and live in more exposed locations such as flood-prone areas. Richer communities and countries can invest in defences, technology and recovery, so they are better protected.
Markers reward two clear effects on food production, and a sound explanation linking vulnerability to limited resources, dependence on climate-sensitive livelihoods, and exposure.
Original5 marksExplain how rising sea levels can affect people living in low-lying coastal areas.Show worked answer →
Rising sea levels increase the risk of coastal flooding, which can damage or destroy homes, businesses and infrastructure such as roads and power supplies, and endanger lives during storm surges.
They cause coastal erosion, eating away at land and beaches, and saltwater intrusion, where seawater seeps into the soil and freshwater supplies, ruining farmland and contaminating drinking water.
In severe cases, people may be forced to leave their homes permanently, becoming displaced (sometimes called climate refugees), losing land, livelihoods and community. Whole low-lying island communities can be threatened.
Markers reward specific human consequences (flooding damage, erosion, saltwater contamination of land and water, displacement) linked clearly to rising sea levels in low-lying areas.
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