Economic development is dependent with the energy consumption; furthermore, the energy consumption will give rise to the increment of CO 2 emissions. According to the "5th Assessment Report of the Intergovernmental Panel on Climate Change (IPCC), " the atmospheric concentration of CO 2 had risen to 391 mg/L by 2011, which were 40% increase over the figures before industrialization. The latest 30 years, that is, from 1983 to 2012 may be the hottest decades in the past 1400 years (IPCC 2014). As global warming has become one of the most serious environmental problems worldwide, issues related to carbon dioxide (CO 2) emissions have attracted close attention in the worldwide (Li et al. 2015). Meanwhile, China has surpassed the USA in CO 2 emissions in 2008, having become the world's largest emitter and energy consumer which makes China face more and more pressures on the control of its CO 2 emissions (BP 2013; Zhu et al.