Pump carbon dioxide into, say (7)

I believe the answer is:

pollute

(Other definitions for pollute that I've seen before include "Make dirty or impure" , "Contaminate; defile" , "Taint, foul" , "Adulterate, contaminate" , "Taint or contaminate, air or water" .)

I've seen this clue in the King Feature Syndicate.

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