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greenhouse gas

 
 
noun [C or U] ENVIRONMENT

Definition

one of several gases, especially carbon dioxide, that prevent heat from the earth escaping into space, causing the greenhouse effect: We need a global system for limiting greenhouse gas emissions. Radical steps to reduce greenhouse gases will have a huge effect on the economy.
→ Compare climate change, global warming
(Definition of greenhouse gas noun from the Cambridge Business English Dictionary © Cambridge University Press)

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