Definition of carbon neutral adjective from the Oxford Advanced Learner's Dictionary

 

carbon neutral

 adjective
adjective
BrE
 
; NAmE
 
 
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in which the amount of carbon dioxide produced has been reduced to nothing or is balanced by actions that protect the environment synonym zero-carbon All of these fuels are renewable and carbon neutral. a carbon-neutral house that uses no energy from external sources buildings designed to be carbon neutral
See the Oxford Advanced American Dictionary entry: carbon neutral