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WordBand 6–7Core (NGSL)
ocean
/ˈəʊ.ʃən/
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dwindleverbTo become smaller or fewer, little by little.
emissions-freeadjectiveProducing no harmful gas.
fragmentationnounThe breaking of something whole into small separate parts.
extinctadjectiveNo longer existing anywhere.
at the expense ofCausing harm or loss to something else.
smognounThick, dirty air in a city, caused by traffic and factory smoke mixing with fog.
emissionnounGas or other substance released into the air.
phase outPhrasal verbTo stop using something gradually.
Source: New General Service List (Browne, Culligan & Phillips) (CC BY-SA 4.0); Wiktionary (CC BY-SA 3.0); Tatoeba (CC BY 2.0 FR)