zero-carbon
adjective [ before noun ] uk/ˌzɪə.rəʊˈkɑː.bən/ us/ˌzɪr.oʊˈkɑːr.bən/
（建筑物、活动、商业行为等）零碳的
A zero-carbon building, activity, business, etc., is one that does not cause any carbon dioxide to be added to the atmosphere
See also: carbon neutral