Last updated: October 20, 2026
Climate change, pollution, and conservation come up again and again in IELTS. These words help you explain environmental problems, their causes, and the solutions.
Each word below has a short meaning and an example sentence written for IELTS. The first six are the core words from our IELTS academic vocabulary list, and the other 24 build your range further. Use them in your essays and in your Speaking Part 3 answers.
If you’re looking for free IELTS Writing practice, click the button below to write an essay and get an instant AI score, including a Lexical Resource band.
play_circle_outline Start Free Writing PracticeTable Of Contents
Core Environment Words
Start with these six. They come up again and again in IELTS questions on this topic.
Emissions
Gases released into the air, especially from vehicles and factories.
- Governments should tax companies that produce high carbon emissions.
Renewable energy
Energy from sources that do not run out, such as wind and sun.
- Investment in renewable energy creates jobs as well as cleaner air.
Deforestation
The large-scale cutting down of forests.
- Deforestation destroys habitats and speeds up climate change.
Sustainable
Able to continue without damaging the environment.
- A sustainable transport system depends on good public transport.
Mitigate
To make something harmful less serious.
- Planting trees in cities can mitigate the effects of heatwaves.
Biodiversity
The variety of plant and animal life in an area.
- Protecting wetlands is essential for biodiversity.
24 More Environment Words
Once you know the core words, these help you add precision and avoid repeating yourself.
Carbon footprint
The amount of carbon dioxide a person or activity produces.
- Flying less is one of the quickest ways to cut your carbon footprint.
Greenhouse gases
Gases that trap heat in the atmosphere.
- Agriculture is a major source of greenhouse gases.
Fossil fuels
Fuels such as coal, oil, and gas.
- Countries must reduce their dependence on fossil fuels.
Conservation
The protection of nature and wildlife.
- Conservation projects have saved several species from extinction.
Ecosystem
All the living things in an area and the way they affect each other.
- Plastic waste is damaging marine ecosystems.
Habitat loss
The destruction of the place where an animal or plant lives.
- Habitat loss is the biggest threat to wildlife.
Endangered
At risk of disappearing completely.
- Poaching has made the tiger an endangered species.
Contaminate
To make something dirty or poisonous.
- Factory waste can contaminate rivers for decades.
Depletion
The reduction of a natural resource.
- The depletion of fish stocks threatens coastal communities.
Landfill
A place where rubbish is buried in the ground.
- Most household waste still ends up in landfill.
Biodegradable
Able to break down naturally without harming the environment.
- Biodegradable packaging could replace much single-use plastic.
Environmentally friendly
Not harmful to the environment.
- Electric buses are a far more environmentally friendly option.
Extreme weather
Very unusual and severe weather.
- Extreme weather events are becoming more frequent.
Rising sea levels
The increase in the height of the oceans.
- Rising sea levels threaten many low-lying cities.
Drought
A long period without rain.
- A prolonged drought destroyed crops across the region.
Air quality
How clean or polluted the air is.
- Poor air quality causes thousands of early deaths each year.
Carbon neutral
Producing no overall carbon emissions.
- The company aims to become carbon neutral by 2035.
Ecological
Connected with the environment and living things.
- The oil spill was an ecological disaster.
Overconsumption
Using more goods or resources than necessary.
- Overconsumption in wealthy countries is a major driver of climate change.
Reforestation
Planting trees where a forest has been cut down.
- Reforestation can restore damaged land and absorb carbon.
Natural disaster
An event such as a flood, storm, or earthquake.
- Poorer countries suffer most from natural disasters.
Environmental degradation
Damage to the natural environment.
- Mass tourism can lead to serious environmental degradation.
Single-use plastic
Plastic that is used once and then thrown away.
- Many cities have banned single-use plastic bags.
Green space
An area of grass or trees in a town or city.
- Green spaces improve residents’ physical and mental health.
Using These Words in IELTS Writing
Lexical Resource is a quarter of your Writing band. Examiners look for a range of topic words used accurately and in natural combinations, not for the longest words you know.
- Use a few well, not many badly. Three or four precise words in an essay are worth more than ten forced ones.
- Learn the word with its partners. Note the collocations in each example sentence, such as the verb that goes with a noun.
- Paraphrase the question. Topic words help you restate the question in your introduction without copying it.
Try these words in a real IELTS Writing Task 2 question:
For natural word pairs on this topic, see our IELTS collocations by topic, and to connect your ideas, our IELTS linking words.
Using These Words in IELTS Speaking Part 3
Lexical Resource also counts for a quarter of your Speaking band. Part 3 is where these words fit best: the examiner asks abstract questions about society, causes, and the future, and a precise topic word shows the range that band 7 and above require. In Part 1, everyday words usually sound more natural.
- Use the word in your own sentence. Memorised phrases are easy for examiners to spot.
- Keep the tone conversational. Mix academic words with natural spoken phrases such as “I’d say” and “on top of that”.
- Support every word with an example. A topic word followed by a real example is what develops a Part 3 answer.
Sample Part 3 answer
I think the simplest thing people can do is reduce their carbon footprint, for example by taking the bus instead of driving. Another way is to avoid single-use plastic, since so much of it ends up in landfill or in the sea. That said, individuals can only do so much. Governments need to invest in renewable energy and protect green spaces, because that’s where the real difference is made.
The words in bold are from this page. Notice that each one is part of a natural spoken sentence, followed by a reason or an example.
Practise using these words in a real IELTS Speaking Part 3 answer:
For more questions and the answer patterns that fit them, see our IELTS Speaking Part 3 questions.
More IELTS Academic Vocabulary
Each page has 30 words with examples. For the six core words of every topic on one page, see our IELTS academic vocabulary list.
Education Technology Health Work and the Economy Society and Government Culture and Globalisation Presenting an Argument Cause and Effect Describing Data
Frequently Asked Questions
helpWhat vocabulary do I need for IELTS environment topics?expand_moreexpand_less
Learn words for the problems, their causes, and the solutions, such as emissions, fossil fuels, habitat loss, and renewable energy. Most environment essays and Part 3 questions ask about all three.
helpHow can I use environment vocabulary in IELTS Speaking?expand_moreexpand_less
Use it in Part 3, where you discuss what people and governments should do. A phrase such as reduce your carbon footprint sounds natural in speech and shows a good range of vocabulary.
helpHow do I remember environment vocabulary for IELTS?expand_moreexpand_less
Learn each word with an example sentence and the words it is usually used with, review the list a few times a week, and use three or four of the words in every practice essay and Speaking Part 3 answer until they feel natural.