Crossword Genius

Greenhouse gas (7)

Ross

I think it could be either:

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7

6,7

'greenhouse gas' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for methane that I've seen before include "Greenhouse gas produced by cows" , "Naturally occurring flammable gas" , "Main constituent of natural gas" , "Combustible atmosphere" , "contributor to global warming" .)

I've seen this clue in the Sydney Morning Herald and The Mirror.
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