Based on Johansen Cointegration Test, this paper sheds light on the long-run equilibrium relationship between natural gas consumption, gas production, and GDP in China. Three different natural gas demand scenarios of low, medium and high rates in the next ten years are considered, and a Neural Network Autoregression Model is used to predict the future carbon dioxide emission. We conclude: (1) In all three scenarios, the growth rates of natural gas consumption are all higher than those of natural gas production, while the gap between demand and domestic supply will gradually turn broader and China will largely rely on imports ; (2) In the scenario of low-rate economic growth, natural gas consumption will grow slowly, and it will be difficult to realize the carbon emission reduction targets by 2030 due to low-rate substitution of natural gas for coal; (3) If medium-rate to high-rate economic growth sustains, coupled with rapid increase in natural gas consumption and production, China’s Carbon Emission Reduction Targets for 2030 can be achieved with high-rate substitution of natural gas for coal.
The Chinese central government recently published a new regulation to strictly limit the time minors spend on online games, providing a favorable policy environment for the protection of their physical and mental health as well as their overall development. We first provide empirical evidence that children having more frequent online entertainment would suffer worse school performance. We then adopt analytic hierarchy process to analyze the possible hazards of minors' addiction to online games from such aspects as physical health, academic performance, family relationship, and teacher–student relationship. Recommendations are finally given on how to prevent minors from being addicted to online games.
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