Intsimbi ethobekileyo, luhlobo lwensimbi yekhabhoni. Ikhabhoni ikhona kuzo zonke izithole kwaye xa ikhabhoni yeyona ndawo iphambili kwisabelo kwintsimbi ibizwa ngokuba yi-carbon sensi. Kwelinye icala, isixa sekhabhoni esikhoyo kwintsimbi echaza uhlobo okanye inqanaba lensimbi yekhabhoni. Intsimbi ethobekileyo inowona mxholo uphantsi kwentsimbi yayo nayiphi na intsimbi, kodwa oko akwenzanga kube lula. Ngapha koko, intsimbi ethobekileyo yeyona ibakala lensimbi esetyenziswayo, i-accounting ye-85% yemveliso epheleleyo ye-U.S.