Cika wannan jumla:
COP25 a Madrid, William McDonough da masanin kimiyyar muhalli na ruwa Carlos Duarte sun gabatar da Tattalin Arzikin Carbon a wani taron da Gidauniyar BBVA. Tattalin Arzikin Carbon Circular ya dogara ne akan ra'ayoyin McDonough daga Carbon Ba Maƙiyi bane kuma yana da nufin yin aiki azaman tsarin don haɓakawa da tsara ingantattun tsarin don gudanar da carbon.