人类社会可持续发展的关键是实现能源、经济和环境3个系统之间的协调发展，对3者之间协调状况的定量分析，是本领域的核心问题之一。宁波市经济发展迅速，已成为中国“万亿俱乐部”的新成员，以宁波市为例，建立了能源-经济-环境（3E）系统的指标体系，分析了宁波市及其各个县市区的能源、经济和环境系统的发展水平，并通过耦合协调度算法计算了3个系统之间的耦合协调性。结果表明宁波市经济发展过程中3个系统的耦合协调性呈不断增加的趋势，整体处于一种良好的、可持续的发展状态。
The key of the sustainable development of human society is to realize the coordinated development among the energy system, the economic system and the environmental system. A quantitative analysis of their coordination is one of the core concerns in this field. With the rapid economic development, Ningbo becomes a new member of China's "trillion club". Taking Ningbo as an example, this paper establishes an index system of the energy-economy-environment (3E) system, analyzes the development level of the energy system, the economic system and the environment system in Ningbo and its counties, then calculates the coupling and coordination degree among the three systems with the algorithm for the coupling coordination degree. It is shown that the degree of the coupling and coordination of the three systems is increasing in the process of the economic development of Ningbo City, which is in a good and sustainable development state.
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