China has initiated various dedicated policies on clean energy substitution for polluting fossil-fuels since the early 2010s to alleviate severe carbon emissions and environmental pollution and accelerate clean energy transformation. Using the autoregressive integrated moving average (ARIMA) regression, we project the potentials of substituting coal and oil with clean energy for different production sectors in China toward the year 2030. Based on the projections, a dynamic multi-sectoral computable general equilibrium model, CHINAGEM, is employed to examine: the impacts of future clean energy substitution on China’s energy production, outputs of non-energy sectors, macro-economy, and CO₂ emissions. First, we found that most production sectors are projected to replace polluting fossil-fuels with clean energy in their terminal energy consumption in 2017–2030. Second, clean energy substitution enables producing green co-benefits that would enable improvements in energy production structure, reductions in national CO₂ emissions, and better real GDP and employment. Third, technological progress in non-fossil-fuel electricity could further benefit China’s clean and low-carbon energy transformation, accelerating the reduction in CO₂ emissions and clean energy substitution. Furthermore, the most beneficiary are energy-intensive and high carbon-emission sectors owing to the drop in coal and oil prices, while the most negatively affected are the downstream sectors of electricity. Through research, various tentative improvement policies are recommended, including financial support, renewable electricity development, clean energy utilization technology, and clean coal technologies.

China’s government has enforced a series of renewable energy policies to promote renewable energy development and achieve the dual decarbonization goals. However, there exists great disparity in previous studies on the effectiveness and suitability of renewable energy policies in abating carbon emissions. This study employs a dynamic general equilibrium model and assesses the effectiveness and trade-offs of renewable energy policies in achieving the dual decarbonization goals by 2060 in China. These policies include carbon market (CRP), the reduction of feed-in tariffs (FIT), the reduction of fossil fuel subsidies (FSB), the reduction of renewable energy costs (REC), resource taxes (RTX), and renewable portfolio standards (REP) as well as the mix of these policies. We find that renewable energy policies together could abate China’s CO₂ emissions in 2060 by 2.57 billion tons, but their effectiveness is very different. The REC would have the greatest effectiveness in abating CO₂ emissions, followed by REP and CRP. Renewable energy policies would cause relatively slight damage to China’s GDP, with the exception of the REC (raising GDP by 1.1713%). Regarding trade-offs, most policies will sacrifice China’s internal and external demand but benefit employment. Renewable energy policies will effectively promote the low-carbon transformation of China’s energy structure.

International conflicts cause global energy price fluctuations and supply disruptions, which can threaten energy security and economic growth in energy-importing countries, including China. However, the implications and impact mechanisms of international conflicts on the energy security and economy of oil-importing countries have been poorly explored. Using US economic sanctions on Iran as a case, a global energy-extended computable general equilibrium model, GTAP-E, is employed to assess the impacts of international conflicts on China’s energy production, trade and supply, sectoral outputs, and economic growth. The results indicate that the USA–Iran tension would threaten China’s energy security, mainly due to the instability of the energy supply and the consequent upsurge of energy prices. However, if increased oil exports from other Persian Gulf countries compensate for the global oil supply shortages, China’s energy supply would be generally assured. Moreover, because of the close energy cooperation links between Iran and China, the sanctions could decrease the Chinese outputs of non-energy sectors and economic growth. Nevertheless, compared with sole-sanction situations, the results from a possible USA–Iran tension escalation, going as far as Iran’s closure of the Hormuz Strait, could pose a more serious risk to China’s energy security and economic growth.

The effectiveness of water efficiency improvement is restricted by the water rebound effect by which anticipated water resource saving from improved water efficiency may be partly or wholly offset or even surpassed by an increase in water demand. The economy-wide rebound effect of water efficiency improvement in China is poorly understood. This study explored the economy-wide rebound effect of water efficiency improvement in China based on a multi-sectoral computable general equilibrium model. The results suggested that water efficiency improvement could effectively reduce water consumption in producing sectors and benefit economic growth and employment. However, the decrease in water consumption was much lower than the volume of water efficiency improvement, which indicated that the rebound effect partly offset water savings caused by water efficiency improvement. We observed a larger reduction in water consumption in the long run, which indicated a smaller rebound effect and a more significant effect in saving water resources in the long term. Notably, the total rebound effect in the short-run closure was much larger than that in the long-run closure, and the effect from the production side was much smaller. Hence, the economic-wide rebound effect is primarily derived from the incremental water consumption by households, investors, and governments.