What this lesson teaches
I can explain why climate effects are positive for some, negative for others, and unequal between places.
Syllabus 8834, Topic 1.2, 2. Possible Effects of Climate Change. Will contemporary climate change impact everyone in the same way?
Make a guess
Global average temperature has risen by about 1.1 degrees C. Has every place warmed by the same amount?
- No, because some places have not warmed.
- Yes, because the atmosphere mixes evenly.
- No. Land and the Arctic have warmed faster.
- Yes, because it is a global figure.
Show the answer
No. Land and the Arctic have warmed faster.
A global average hides local differences. Land warms faster than sea, and the Arctic warms fastest, while rain changes vary by place.
Climate change is uneven across places, and people differ in how vulnerable they are, so gains in one place do not cancel losses elsewhere.
A global average hides local differences. Land warms faster than sea, and the Arctic warms fastest. Rainfall changes vary by place. Low coasts face rising seas, while inland cities face heat and dry farms face water shortages. Arctic warming is amplified by several interacting feedbacks.
Some effects are positive in some places, for a time. Longer growing seasons may help some crops at high latitudes. Some fish move into newly suitable waters. But pests, extremes and further warming can reverse these gains. Such gains also depend on soils, water, infrastructure and adaptation.
Negative effects include heat illness, crop losses, water shortages, damaged ecosystems and coastal floods. They are unequal because both the physical change and people's exposure differ. A farming family that depends on seasonal rain faces different risks from an office worker with air-conditioning.
Vulnerability is how easily people are harmed and how well they can cope or adapt. Age, health, income, housing, working conditions, gender and access to services all matter. Outdoor workers cannot avoid heat. Low-income tenants cannot easily improve their homes. Groups are diverse, so support each claim with the actual context.
A gain in one region does not help a household that loses its home elsewhere. Ask who gains, who loses and who can adapt. A gain elsewhere only helps if some mechanism actually transfers money or protection.
- Uneven change
- Land warms faster than sea; the Arctic fastest.
- Vulnerability
- How easily harmed and how well able to cope.
- Local gains
- Do not cancel losses elsewhere.
Step by step
Find the physical change
Warming, rain, sea level or extremes.
Find the exposed activity
A coast, crop, job or settlement.
Explain unequal results
Compare resources, health and options.
Real examples to use
Pakistan floods, 2022
About a third of Pakistan was flooded and 33 million people were affected, although Pakistan produces less than 1% of global emissions.
Tuvalu
Most of this Pacific nation is only a few metres above sea level. In 2023, Australia agreed to offer Tuvaluans a path to migrate there.
Climate injustice: who emitted the carbon
Carbon Brief estimates that the USA caused more than a fifth of all the carbon dioxide released by people from 1850 to 2025, and China about 13%. Pakistan and many African and island states emitted very little, yet face some of the worst floods, droughts and sea-level rise.
Worked example: Two workers in one city
In a heatwave, an office worker has paid leave and air-conditioned transport. A delivery rider spends hours outside and loses pay if work stops. The same temperature causes very different harm.
Watch out for this
A benefit to farming in one region proves climate change helps everyone.
Effects differ by crop, place, group and warming level.
Check your understanding
Two households face the same flood but suffer different long-term losses. What explains this?
- One household was simply unluckier on the day of the flood.
- The global average temperature in the year of the flood.
- Differences in their money, health and recovery options.
Show the answer
Differences in their money, health and recovery options.
Yes. Vulnerability shapes the outcome.