Carbon emission research of Beijing transportation system based on SD

With the fierce increasing of population, prospect for air condition in Beijing is overwhelmingly negative. Transportation takes a great part in the total carbon emissions and the percentage keeps going up. In this paper, a Beijing transportation system model is built using System Dynamics and four sub-systems are considered which are cars, bus, taxies and subway transportation sub-systems. After that, simulation of the system in three different scenarios is made to compare the different effects. It turns out that the carbon emissions of car system is the major part of total transportation carbon emissions. Therefore, methods to reduce car carbon emissions should be developed to produce an effective progress of air condition like reducing the amount of cars or cutting down the energy consumption of cars.