Environment & Climate (Advanced) — C1 Essential Words

sustainable /səˈsteɪnəbəl/ adjective C1 Environment

Meaning: Able to continue for a long time without using up resources or harming the environment.

Example: The farm uses sustainable methods to grow food.

Another example: Tourism must become sustainable to protect the islands.

Collocations: sustainable development · sustainable energy · sustainable farming

Synonyms: renewable, lasting, eco-friendly

Antonyms: wasteful, short-term

Word family: sustainability (n) · sustain (v) · sustainably (adv)

⚠ Common mistake: Sustainable describes systems that can KEEP going. Its noun, sustainability, fills company reports yearly.

🗣 In spoken American English: Every product now claims it — checking the claim is the consumer's new skill.

Register: Formal — environment core adjective.

emission /ɪˈmɪʃən/ noun C1 Environment

Meaning: An amount of gas or other substance released into the air, especially harmful gases from cars and factories.

Example: The law limits factory emissions.

Another example: Electric cars produce no emissions while driving.

Collocations: carbon emissions · cut emissions · emission levels

Synonyms: release, output, pollution (result)

Antonyms: absorption

Word family: emissions (n pl) · emit (v)

⚠ Common mistake: Almost always plural in climate talk: emissions rise/fall. The verb is emit — factories emit gases.

🗣 In spoken American English: National promises are counted in them: 'net-zero emissions by 2050'.

Register: Formal — climate essential.

conservation /ˌkɒnsərˈveɪʃən/ noun C1 Environment

Meaning: The protection of nature — animals, plants, forests, and water — and using resources carefully.

Example: Conservation groups protect the wetlands.

Another example: Energy conservation starts at home.

Collocations: wildlife conservation · conservation of · conservation area

Synonyms: protection, preservation, saving

Antonyms: destruction, waste

Word family: conserve (v) · conservationist (n)

⚠ Common mistake: Conservation protects nature AND saves resources (energy conservation). Conservative (politics) is a different word family — don't merge them.

🗣 In spoken American English: National parks are its temples; rangers are its priests.

Register: Formal — environment core.

extinction /ɪkˈstɪŋkʃən/ noun C1 Environment

Meaning: The situation when a species dies out completely and no longer exists anywhere.

Example: Habitat loss leads to extinction.

Another example: The extinction of the dinosaurs happened 66 million years ago.

Collocations: face extinction · extinction of · mass extinction

Synonyms: dying out, disappearance, annihilation

Antonyms: survival, recovery

Word family: extinct (adj) · extinctions (n pl)

⚠ Common mistake: The adjective is extinct (volcanoes can be extinct too — no longer active). Species GO extinct or FACE extinction.

🗣 In spoken American English: It is the saddest word in biology — the end of a line millions of years long.

Register: Formal — science essential.

renewable /rɪˈnjuːəbəl/ adjective C1 Environment

Meaning: Able to be replaced naturally and used forever without running out — like wind, sun, and water power.

Example: Solar is a renewable energy source.

Another example: The country invests in renewable power.

Collocations: renewable energy · renewable resources · renewable source

Synonyms: sustainable, green, inexhaustible

Antonyms: nonrenewable, fossil

Word family: renewables (n pl) · renew (v)

⚠ Common mistake: Renewable vs sustainable: renewable names the SOURCE (never runs out); sustainable names the SYSTEM (can keep going).

🗣 In spoken American English: Rooftops wear the proof: solar panels are the renewable billboard.

Register: Formal — energy essential.

biodiversity /ˌbaɪəʊdaɪˈvɜːrsəti/ noun C1 Environment

Meaning: The variety of plant and animal life in a place or in the world, and the systems that hold them together.

Example: Rainforests hold enormous biodiversity.

Another example: Protecting biodiversity protects our food and medicine.

Collocations: rich biodiversity · biodiversity loss · protect biodiversity

Synonyms: variety of life, biological diversity

Word family: biodiverse (adj)

⚠ Common mistake: One word measuring life's variety: genes, species, ecosystems. Its loss is quiet — no single charismatic victim.

🗣 In spoken American English: Reports rank countries by it: the Amazon basin leads the world.

Register: Formal — science core.

ecosystem /ˈiːkəʊˌsɪstəm/ noun C1 Environment

Meaning: All the living things in an area together with their environment, working as one connected system.

Example: Coral reefs are rich ecosystems.

Another example: Removing one species can damage the whole ecosystem.

Collocations: marine ecosystem · ecosystem services · fragile ecosystem

Synonyms: habitat system, biosphere (planet-wide)

Word family: ecosystems (n pl) · ecological (adj)

⚠ Common mistake: Eco- (household of nature) + system: everything feeds everything else. Tech borrowed it: 'the app ecosystem'.

🗣 In spoken American English: Documentaries narrate it as a web: pull one thread, the web trembles.

Register: Formal — science essential.

carbon /ˈkɑːrbən/ noun C1 Environment

Meaning: A chemical element found in all living things and in coal and diamonds; in climate talk, short for carbon dioxide and other greenhouse gases.

Example: Burning coal releases carbon into the air.

Another example: Trees absorb carbon as they grow.

Collocations: carbon emissions · carbon footprint · carbon tax

Synonyms: CO2 (in shorthand), element

Word family: carbons (n pl — chemistry) · carbonate (n)

⚠ Common mistake: Your 'carbon footprint' is the climate weight of how you live — the phrase made the element personal.

🗣 In spoken American English: Offset markets trade it like money: plant here, emit there.

Register: Formal — climate and chemistry.

preserve /prɪˈzɜːrv/ verb C1 Environment

Meaning: To keep something in its present good condition, safe from harm or change.

Example: The law preserves the old forest.

Another example: Photographs preserve memories.

Collocations: preserve nature · preserve the building · well preserved

Synonyms: protect, conserve, maintain

Antonyms: destroy, neglect

Word family: preservation (n) · preservative (n — food chemical)

⚠ Common mistake: Preserve is keep-as-it-is (a forest, a building, a memory); conserve allows careful use. Food preservatives are chemicals — same root, different room.

🗣 In spoken American English: Historic districts carry its signs: 'Preservation Area'.

Register: Formal — heritage and environment.

erosion /ɪˈrəʊʒən/ noun C1 Environment

Meaning: The slow wearing away of soil, rock, or land by water, wind, or weather; also the gradual weakening of something.

Example: River erosion shapes the canyon walls.

Another example: Beach erosion worries coastal towns.

Collocations: soil erosion · coastal erosion · erosion of

Synonyms: wearing away, loss, decay

Antonyms: buildup, deposit

Word family: erode (v) · erosive (adj)

⚠ Common mistake: Erosion is slow theft — of beaches, farmland, and (figuratively) rights and trust. The verb is erode.

🗣 In spoken American English: Grand Canyon is its masterpiece: water plus time.

Register: Formal — geography essential.