## 5 Discussion and Policy Recommendations  
This paper quantified the interaction between economic development and the ecological environment. According to previous studies, it is feasible to use remote sensing technology to monitor and evaluate the urban ecological environment [40; 41; 42; 43]. In our study, we constructed three spectral indices, namely, NDVI, NDWI, and NDBI, as well as the NPP as a basic-level index, and we combined subjective and objective indices to calculate their weight, so as to integrate the quantitative factors. The relationship between these indicators and the ecological environment has been confirmed by studies. NDVI and NDWI are positively correlated with the ecological environment, while NDBI is negatively correlated with the ecological environment [52]. The administrative area of Wuhan was divided into high-ecological-value areas and low-ecological-value areas. Overall, the decoupling index of both areas showed an obvious difference. This difference was mainly reflected in the opposite trend over time, indicating \"strong decoupling\" since 2016. On 26 May 2016, Wuhan Municipal People's Government issued a report on the establishment and improvement of the ecological compensation mechanism, confirming the rationality of our research results. The interaction between urbanization and the ecological environment is a dynamic process with a curvilinear change from imbalance to balance [53]. From the perspective of spatial heterogeneity, the ecological level of Wuhan generally presented an ecological layout of \"high in the periphery and low in the center\", with the outer urban areas having high ecological value and the central city having low ecological value. The research of [PERSON] et al. [54] showed that the development resistance of Wuhan presents a three-dimensional \"inverted pyramid\" spatial state. The ecological level of each region changed dynamically, but generally followed the layout according to \"center and periphery\". This mechanism of action needs to be further studied. According to the empirical analysis results of this paper, combined with the relationship between ecological environment and economic development, as well as the current rapid development of Wuhan, aiming at the urbanization process and carbon emission control and other factors, we provide the following suggestions:  
1. Promote green development through local policy. We should continue to push the urbanization process forward while combining the development differences and spatial heterogeneity of different regions. Local governments should improve the efficiency of urban infrastructure, such as public systems, and reduce carbon emissions. 2. Adhere to green production and improve urban ecological environment. While urban economic development is being achieved, the ecological environment should also be optimized. A relationship between these two elements can move the city in the direction of green and low-carbon development. 3. Reasonably control energy consumption and raise awareness of low-carbon environmental protection. Energy consumption is a mainstay; hence, we should advocate the low-carbon concept in economic development and life, maintaining a simple and low-carbon consciousness. At the same time, with the continuous improvement of the technical level, we should pay attention to and provide targeted support for projects with less pollution and low energy consumption, such as transformation and marketing. 4. Promote the construction of wetland culture and grasp the ecological advantages. This can be achieved by protecting the integrity of wetlands, maintaining and increasing carbon sinks, building Wuhan's \"Wetland City\" business card, and building an international wetland city. Since China's \"double-carbon\" development strategy was put forward, a series of related policies and action guidelines have been formulated, and various regions have successively made corresponding development goals and plans, as well as formulated specific implementation plans.