Politician chats about parliament and means to maintain warmth (10,5)

I believe the answer is:

greenhouse gases

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'means to maintain warmth' is the definition.
I don't know anything about this answer so I can't tell whether this works.

'politician chats about parliament' is the wordplay.
'politician' becomes 'green' (eg member of the Green Party).
'chats' becomes 'gases'.
'about' is a charade indicator (letters next to each other).
'parliament' becomes 'house' (the House of Commons).
'gases' after 'house' is 'housegases'.
'green'+'housegases'='GREENHOUSE GASES'

'and' acts as a link.

Can you help me to learn more?

(Another definition for greenhouse gases that I've seen is " carbon emissions".)

I've seen this clue in The Guardian.

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