IELTS Environment Vocabulary: 40 Words + Collocations

The environment is the most predictable topic in IELTS. It appears in Writing Task 2 essays, in Speaking Part 3 discussions about your city, and in Reading passages about conservation. Below are 40 items — single words plus a few fixed phrases that behave like single words — organised so you can actually use them.

Every entry shows the collocation, because that is how the words appear in real answers, and a use column: W for Writing, S for Speaking, both where it is natural in either. That last column is the part most vocabulary lists leave out, and it matters — see the Speaking vs Writing rule that runs through this whole series.

Nouns (16)

Word	Use it like this	Use
climate change	tackle / combat climate change	both
carbon footprint	reduce your carbon footprint	both
greenhouse gas	greenhouse gas emissions	W
renewable energy	invest in renewable energy	both
fossil fuel	our reliance on fossil fuels	W
deforestation	large-scale deforestation	W
biodiversity	a loss of biodiversity	W
ecosystem	damage a fragile ecosystem	W
pollution	tackle air / water pollution	both
emissions	cut carbon emissions	both
landfill	waste ends up in landfill	both
conservation	wildlife conservation efforts	W
sustainability	long-term sustainability	W
habitat	destroy natural habitats	W
drought	a prolonged drought	both
waste	reduce household waste	both

Verbs (12)

Word	Use it like this	Use
pollute	factories pollute nearby rivers	both
conserve	conserve water / energy	both
recycle	recycle packaging	both
deplete	deplete natural resources	W
offset	offset carbon emissions	W
mitigate	mitigate the effects of flooding	W
dispose of	dispose of waste safely	W
emit	emit harmful gases	W
preserve	preserve the countryside	both
tackle	tackle the problem at source	both
curb	curb the use of plastic	W
degrade	degrade the soil	W

Adjectives (12)

Word	Use it like this	Use
sustainable	a sustainable solution	both
renewable	renewable sources of energy	both
eco-friendly	eco-friendly packaging	S
environmentally friendly	an environmentally friendly policy	W
toxic	toxic chemicals	both
endangered	an endangered species	both
disposable	disposable plastics	both
carbon-neutral	a carbon-neutral city	W
adverse	the adverse effects of pollution	W
finite	finite resources	W
arable	arable land	W
urban	urban air quality	both

That is 16 + 12 + 12 = 40 items.

Which of these to actually say out loud

Twenty of the forty are marked W — exactly half. Those are the ones to keep out of your Speaking answers, and the reason is worth understanding.

Compare two answers to “What environmental problems does your city have?”

❌ “The metropolitan area suffers from adverse air quality attributable to the depletion of green space and excessive vehicular emissions.”

✅ “Air pollution is the big one. There’s way too much traffic, and they keep building on the green spaces we do have.”

The first is not wrong — it would be fine in an essay. Spoken, it sounds recited, and it will interrupt the natural rhythm the Speaking test is listening for. The second uses air pollution, traffic and green spaces — all ordinary, all precise, all clearly owned by the speaker.

In Writing, invert the advice. Adverse, finite, deplete and mitigate are exactly what an essay wants.

Common mistakes

These come up constantly, and each one is easy to fix:

1. “Pollutions” does not exist. Pollution is uncountable: air pollution, a lot of pollution, pollution levels — never pollutions or a pollution.
2. The environment takes “the”. It is protect the environment, not protect environment. Same with the countryside, the atmosphere.
3. Mitigate takes effects, not problems. You mitigate the effects of something, but you tackle or address a problem. Mitigate the problem sounds off.
4. Renewable energy is uncountable. Renewable energies is a common slip. Say renewable energy or renewable sources of energy.
5. Don’t stack the abstract nouns. The sustainability of the conservation of biodiversity is technically English and completely unreadable. One abstract noun per clause is plenty.
6. Eco-friendly is informal. Great in Speaking. In a formal essay, prefer environmentally friendly.
7. Research and advice are uncountable too. Researches and advices are frequent errors when writing about environmental studies.

Building answers from these

The words are raw material; the marks come from what you build. A quick structure that works for almost any environment question:

1. Name the problem precisely — air pollution, not bad things in the air.
2. Give the mechanism — because traffic volumes have risen and there is less green space to absorb emissions.
3. Give the consequence — which drives up rates of respiratory illness.
4. Then the solution — investing in public transport would curb private car use.

Step 2 is where most answers fall down. Naming a problem is easy; explaining how it happens is what separates a developed idea from a listed one — and it is where these collocations earn their keep.

Practising them

Write one true sentence per word about your own city — not a generic example. “The landfill outside my town has doubled in size since I was a child” is far more memorable than “Landfill is a problem in many countries”, and under exam pressure you will recall the real one.

Then say the S and both items out loud until they are automatic. If you don’t have a speaking partner, these methods work alone.

Next in this series: education vocabulary, the topic that overlaps most often with this one — essay questions regularly ask whether schools should teach environmental responsibility.