A Writing Task 2 prompt asks: "What environmental problems are caused by consumer demand, and what measures could address them?"
A common answer says:
"We must reduce pollution because it damages nature. Resources are limited, and the damage could be permanent."
The idea is clear, but each key word covers too much. Does the policy control the source or soften its effects? Are resources bounded, scarce, or almost gone?
Environment tasks in Writing Task 2 and Speaking Part 3 often turn on these choices. Range matters, but so do precision, collocation, and flexible use. The goal is not a list of green words. It is choosing the word that matches the claim.
The lexical decision: name the action, state, or risk
Before choosing an advanced word, decide what your sentence must do. Controlling a harmful trend, easing harm, worsening a problem, and naming a limit are different claims.
1. Curb vs. reduce, restrict, and mitigate
Curb means control something seen as unwanted, such as emissions or illegal dumping. It does not mean remove it.
- Reduce reports a neutral fall in amount: reduce water use by 10%.
- Restrict sets a rule about amount, range, access, or permission: restrict cars from the city center.
- Mitigate makes harm, risk, or impact less severe: mitigate the health effects of air pollution.
Grammar: use curb + direct object, not curb down. The noun frame is a curb on + noun. An aim to curb pollution does not prove it fell.
2. Mitigate vs. alleviate and offset
Mitigate takes a negative object. It reduces the chance, severity, or effects of harm without necessarily removing it: Wetlands can mitigate flood risk.
Alleviate is more natural for a burden, discomfort, or worry: Grants may alleviate the burden on low-income households. Offset means balance a harm with a separate benefit or action. The original harm may remain: Tree planting may offset part of the emissions from a flight.
Grammar: write mitigate the risk, not mitigate against the risk. Use offset X with Y or X is offset by Y. Neither guarantees that harm disappears.
3. Exacerbate vs. aggravate, worsen, and compound
Exacerbate means make an existing negative condition worse. It is formal and transitive: Drought could exacerbate the food shortage. Use may or could when the causal link is uncertain.
Aggravate overlaps, but it can also mean annoy. Worsen is broader and can work without an object: The shortage worsened. Compound highlights an extra problem joining the first: Drought compounded the damage caused by poor soil.
Grammar: use exacerbate + problem or the problem was exacerbated by + factor. Do not write the problem exacerbated when you mean it became worse.
4. Deplete vs. exhaust and use up
Deplete means reduce a stock, reserve, resource, or population by drawing on it. It does not say that nothing remains.
"Years of irrigation have severely depleted the aquifer, though it still holds water."
Exhaust and use up say all of the supply is gone. Use up is lighter. If nothing remains, all three can fit. If some remains, these two overstate the loss.
Grammar: deplete a reserve, a reserve depleted by farming, or soil depleted of nutrients. The noun is depletion.
Understanding is only the first step.
Lyra Practice helps you retrieve and use high-value workplace expressions in realistic situations until they feel natural.
Start a practice session →5. Irreversible vs. permanent and irreparable
Irreversible says a change, loss, process, or decision cannot be undone. It says nothing about certainty, speed, or severity.
Permanent means lasting indefinitely. It overlaps for lasting damage, but also fits a lasting status: a permanent protected area. Irreparable means unable to be repaired. It fits harm, but not usually a trend or process.
Grammar: use irreversible damage, the change became irreversible, or irreversibly altered. For an open risk, keep the hedge: The loss could become irreversible.
6. Finite vs. limited and scarce
Finite means a limit or end exists. It does not mean small or nearly gone. A supply can be vast but finite.
Limited overlaps and has the frame limited to + cap: Entry is limited to 200 vehicles. Scarce adds a present shortage or difficulty of supply.
Grammar: use finite resources, a finite amount of water, or fresh water is finite. Do not write finite to 200 liters.
7. Pose a threat vs. threaten, endanger, and jeopardize
Pose a threat to names a source of possible harm. It does not say harm has happened or that anyone intends it.
"Rising sea levels pose a threat to coastal farms."
Threaten, endanger, and jeopardize overlap in the danger sense. They take direct objects: rising seas threaten farms, endanger homes, or jeopardize food production. Another frame is threaten to + verb.
Use threat to + what may be harmed but threat of + the harm: the threat to farms; the threat of flooding.
8. Take its toll vs. damage
Take its toll on says that a pressure or event causes serious harm. The harm often builds over time, but one severe event can also take a heavy toll.
Damage overlaps but uses a different frame: The drought damaged farms; the drought took its toll on farms. The phrase asserts serious harm but does not state its exact scale or permanence.
Grammar: the possessive agrees with the subject. The drought took its toll. Years of drought took their toll. The safe form took a heavy toll on avoids that choice.
Lower-scoring and higher-scoring: the same idea, sharper claims
Prompt: "Some people think individuals cannot do much to protect the environment. To what extent do you agree?"
Lower-scoring version:
"I disagree because people can reduce pollution. Natural resources are limited, and pollution damages the planet. If people use less energy, they can stop the problem from getting worse."
Higher-scoring version:
"I disagree to some extent. Household choices alone cannot curb industrial emissions, but lower demand can mitigate some of their impact. That matters because fossil fuels are finite, even when they are not yet scarce. It also matters because delay could exacerbate damage that may become irreversible."
The second version is stronger because:
- Curb targets the harmful trend, while mitigate targets its impact.
- Finite makes the intended bounded sense explicit here; limited can also be correct in that sense.
- Could exacerbate makes a cautious claim about worsening.
- May become irreversible keeps possibility separate from a point of no return.
A Part 3 exchange
Examiner: What is the biggest environmental problem in cities?
Candidate: Air pollution poses a serious threat to public health. Traffic restrictions may curb emissions at the source, while better health services can only mitigate some of the effects.
Examiner: Can the problem be solved quickly?
Candidate: Probably not. Years of poor air quality have taken their toll on many communities. Delay could also exacerbate the problem, but that does not mean every effect is irreversible.
Common mistakes
- Using mitigate for any decrease. It needs a negative object such as risk, harm, or impact.
- Writing curb down pollution. Use curb pollution.
- Treating depleted as empty. It reports reduction; exhausted states that all is gone.
- Using scarce for any finite resource. Scarcity means present insufficiency.
- Confusing irreversible with inevitable. One concerns undoing; the other concerns certainty.
- Adding to after danger verbs. Write threatens homes but poses a threat to homes.
- Writing took its toll the forest. The affected thing follows on.
Quick check
1. The water supply is still plentiful, but it has an end. Which word fits?
A. scarce
B. finite
C. exhausted
2. A sea wall does not stop storms, but it makes their impact less severe. What does it do?
A. mitigates the impact
B. curbs down the impact
C. exhausts the impact
3. Which sentence has the right frame?
A. "Heat waves pose a threat to crops."
B. "Heat waves threaten to crops."
C. "Heat waves take their toll crops."
Answers: 1-B, 2-A, 3-A. Finite states a bound without claiming a shortage. Mitigate reduces harm without claiming prevention. Pose a threat to takes the source as its subject and the endangered thing after to.
Practice prompt
Writing Task 2 style: "Some people believe economic growth always causes environmental damage. Discuss this view and give your opinion."
Write one paragraph of four to five sentences. Use one word for controlling a harmful trend, one word for worsening an existing problem, and one word that states either a bound or a present shortage. Add the grammar frame each word needs. Do not claim that a measure removes all harm unless your sentence gives a reason.
If you want to practice choosing precise words for IELTS environment answers, try Lyra Practice.