随着经济快速发展，我国能源、资源、环境、生态等方面的问题日益突出，成为影响我国可持续发展的主要瓶颈，区域能源-经济-环境-生态（4E）系统急需优化。特别是近年来，二氧化碳（CO2）减排已经成为我国面临的新挑战之一。本项目采用自上向下与自下向上相结合的系统建模思想，综合应用投入产出理论、动态多目标优化方法、宏观经济学、产业经济学等多学科理论与方法，结合我国实际情况，从可持续发展角度出发，开展区域能源经济4E系统耦合优化模型及其在碳减排中应用的理论与方法研究。本项目不仅考虑能源、经济、环境、生态系统的优化和评价模型，并基于复杂大系统建模思想，建立CO2减排技术路线模型。鉴于CO2减排方式的复杂性和动态性等特点，根据技术经济评价和优化理论，在4E系统耦合优化模型中着重分析了CO2技术性减排，即CCUS（碳捕集、运输、利用、封存）技术的成本经济效益。本研究为我国可持续发展政策的制定提供了理论支撑。

With the rapid economic development, issues of energy, resources, environment, ecology and other aspects become increasingly prominent, being major bottlenecks affecting the sustainable development of China. Thus, regional Energy-Economy-Environment-Ecology (4E) system is in urgent need of optimization. Especially in recent years, carbon dioxide (CO2) emissions reduction has become one of the new challenges facing China. This project uses system modeling ideas blending top-down and bottom up approaches, comprehensively applying input-output theory, dynamic multi-objective optimization method, macroeconomics, industrial economics and other disciplines theory and methods to the research of coupled optimization model of 4E system and its application in CO2 reduction from the perspective of sustainable development with China's actual situation. Besides considering optimization and evaluation models of energy, economic, environment, and ecosystem, we also establish CO2 reduction technology roadmap models based on complex system modeling ideas. Given the complexity of CO2 reduction methods and dynamic characteristics, based on technological economy evaluation theory, this project focuses on analysis of economic costs of CO2 technical reduction, namely CCUS (Carbon Capture, Utilization and Storage). The study provides theoretical support for China's sustainable development policy making.