carbon-zero
adjective environment, business specialized uk/ˌkɑː.bənˈzɪə.rəʊ/ us/ˌkɑːr.bənˈzɪr.oʊ/
零碳（一家企业或机构不向环境中释放任何二氧化碳，或释放与吸收二氧化碳的量相同）
If a company or an organization is carbon-zero, it does not release any carbon dioxide into the environment or it removes the same amount of carbon dioxide from the environment as it puts into it.
See also: carbon neutral