TransJakarta Busway, a Bus Rapit Transit (BRT) system, has been implemented in Jakarta, Indonesia, since February 2004. The media publicities largely covered the system as a new hope for an unending congestion mitigation in Jakarta. As many have learned, the BRT system has far more potentials than merely congestion mitigation. BRT has effectively and effiently reduced carbon emission from transportation sector, the second largest contributors to green house gasses emissions leading to the change of global environment. The fact that there were limited discussions about climate change when TransJakarta Busway was initiated is worth to study.