Green Development Evaluation of Tai ’ an Based on Entropy Method

In order to realize the harmonious development between human beings and nature, we must adopt the environment-friendly production and consumption mode based on the carrying capacity of the environment, with less pollution and low loss of industrial structure and sustainable development of green industry to pursue the coordinated, comprehensive, and sustainable development of economy, society, and environment. Based on the analysis of the economic, resource, and environmental data of Tai ’ an, Tai ’ an made signi ﬁ cant achievements in promoting the green development of the city. It shows that the measures of promoting green development to drive economic and social development in Tai ’ an City have achieved certain results. The paper used the entropy method to calculate the comprehensive evaluation index of the green development in Tai ’ an to measure the developments of “ Green Tai ’ an ” comprehensively and has analyzed the progress of the construction in recent years and put forward some relevant suggestions in view of the existing problems.


Introduction
Environmental protection and green development in the 21st century have become the most important issues for human development. Green development is a mode of economic growth and social development aiming at efficiency, harmony, and sustainability (Wang). From the perspective of economy, how to promote economic development and at the same time enhance social benefits and reduce environmental pollution has become the core issue of sustainable development. As the theme of green and sustainable development, the first International Conference on Economic Management and Green Development in 2018 will discuss issues and research hotspots in the fields related to social sciences such as smart city, low-carbon economy, supply chain management, culture and education, and public management in green and sustainable development. Many countries have formulated green development strategies and policies, such as resource conservation and green and low-carbon development, in order to realize the coor-dinated development of economy, society, and environment [1,2].
The fifth Plenary Session of the 18th CPC Central Committee put forward the concept of green development as one of the five development concepts in the 13th Five-Year Plan and beyond [3,4]. On the surface, green development is to ensure that the ecological environment is green, the mode of production is clean, and the economy and the natural environment are highly coordinated. From the perspective of connotation, green development is a new development mode that takes environmental protection as an important pillar to achieve sustainable development under the constraints of ecological environment capacity and resource carrying capacity [5,6].
The report clearly pointed out that the party's 19th, we are going to the construction of modernization is the modernization of harmonious coexistence between man and nature [7], both to create more material wealth and spiritual wealth to meet people's increasing need of a better life [8,9] and to provide more high quality ecological products to meet people's increasing need beautiful ecological environment [10,11].
Green development brings us a new concept of development, which emphasizes the conservation of natural ecology and the sustainable use of resources [12,13], and takes ecological and environmental carrying capacity into consideration on promoting economic and social development. At the same time, the development goal is to achieve sustainable development in economy, society, and environment, and the theme and approach of development are to achieve "green" and "ecological" economic activities [14,15]. In recent years, through a series of policies and measures, such as industrial transformation and upgrading, pollution prevention, and control, Tai'an has been steadily improving, and the ecological environment has been effectively protected. It is of great significance to comprehensively evaluate the effect of economic and social development and natural ecological protection in Tai'an and to construct a green development evaluation index system to comprehensively measure the development of "green Tai'an."

2.2.
Resource and Environmental Development. The comprehensive utilization of resources in Tai'an has achieved certain results. The total amount of comprehensive utilization of industrial solid waste is nearly 10 million tons per year, and the proportion is over 95%. The average concentration of sulphur dioxide, nitrogen oxides, respirable particulate, and fine particulate matter in 2019 is 18, 36, 102, and 51 in Tai'an (unit: μg/m 3 ). In recent years, the government of Tai'an has carried out the prevention and control of air pollution in an all-round way and has completed the stoppage and green renovation of 2820 coal-fired boilers and 53 coal-fired units of the low-emission transformation work. Besides, Tai'an has vigorously promoted the use of v gasoline and diesel in transport vehicles and dealt with substandard yellow standard vehicles. At the same time, it forced the closure of "three high and two low" enterprises without meeting the standards of energy conservation and emission reduction to create a good environment for the construction of "Green Tai'an."

Principles of Index Selection
3.1.1. Principle of Coordination. The definition of green development involves two dimensions: green and development. Green evaluation mainly includes a series of indicators such as resource and energy consumption, natural environment protection, and sustainable development of natural ecology. Development evaluation mainly measures the economic level of a Tai'an, and green development is to fully reflect the organic combination of the green and the development. Therefore, when selecting indicators according to the principle of coordination, consideration should be given to the carrying capacity level of natural environment, greening level of regional economic development, and government's investment in green development.

Principle of Scientific.
To select Tai'an green development evaluation index, the characteristics of Tai'an green development must be fully grasped, and the corresponding index system should be established under the guidance of scientific principles. Therefore, it is necessary to combine the development law of natural science and select the indexes scientifically and rigorously, so as to lay a good foundation for the follow-up objective and real evaluation.
3.1.3. Principle of Systemic. The construction of Tai'an green development index system needs to consider many factors, and the selected index should fully reflect the typical characteristics of Tai'an green development in politics, economy, culture, and ecological environment. Therefore, indicators must be selected from various factors involved in Tai'an green development to form a systematic index system for comprehensive evaluation.
3.1.4. Principle of Feasibility. In the selection of indicators, attention should be paid to the validity, authenticity, and objectivity of data obtained. Most of the data of these indicators can be consulted in the Tai'an statistical yearbook, and the data related to these indicators can also be consulted in the Tai'an government work report.
3.1.5. Principle of Dynamic. The principle of dynamics refers to that the dynamic change process of Tai'an green development should be fully grasped in the selection of indicators. Under the guidance of this principle, the selection of Tai'an green development evaluation index must comprehensively analyze the dynamic change characteristics of green development and collect relevant data in recent years for continuous dynamic analysis.
3.1.6. Principle of Representativeness. The principle of representativeness means that key representative indicators must be selected to highlight the comprehensive characteristics of Tai'an's economic and social development and changes in the selection of indicators.

3.2.
Ideas of the Index System. In order to comprehensively measure the green development degree of Tai'an, we would build a complete index system, including the following indicators such as the efficiency of green development, the carrying capacity of green development, and the improvement of green development, so as to achieve the effect of comprehensive evaluation of economic and social development and the bearing capacity of natural environment and ecological protection of Tai'an.
Second, the characteristics of Tai'an green development are combined in the index selection process, such as adding Tai'an proportion of tertiary industry, Tai'an green area per capita, and Tai'an public transport per 10,000 people, to lay a foundation for more effective evaluation of Tai'an green development.
Third, the influence of Tai'an government on Tai'an green development should be enhanced. The promotion of green development cannot be achieved without the guidance and help of Tai'an government. In the selection process, the index of Tai'an government support for green development should be added, such as the proportion of individual expenditure on natural ecological protection in the total fiscal expenditure.
Fourth is the accessibility, accuracy, and objectivity of relevant data. All the data are from the published yearbook and official data released by the government departments of Tai'an.

Selection of Indicators.
According to the availability of index data, the evaluation index system of green development in Tai'an has selected 21 indexes (Table 1).

Data Processing.
Because the units of different indexes are different, the indexes cannot be compared and calculated directly. In order to ensure the accuracy of analysis results, it is necessary to standardize the original data. In this paper, the minimum-maximum standardization method is selected to standardize the data.  Step 1. Determine the original index value. Suppose there aremindicators,nannual samples,xi jasi(i = 1, 2, ⋯, n) year, andj(j = 1, 2, ⋯,) raw data values.
Step 2. For data standardization, positive index (numerical number is the higher and the better) of the minimum value standardization formula is as follows [16]: Reverse index (numerical number is the smaller and the better) of the maximal value standardization formula is as follows: whereX ij ′ is the standardized values,max X j is the maximum forjindex, andmin X j is the minimum forjindex.
Step 3. Calculate the proportion of year i under index j in the indicator P ij .
Step 5. Calculate the difference coefficient of the j index. Forg j , the calculation formula is as follows: The bigger difference coefficient of an indicator is, the more information it provides. The greater effect it takes, the greater weight it should be given.
Step 6. Calculate the index weight. The formula is as follows: According to the above calculation, the entropy value, difference coefficient, and weight of the index [17] are obtained as shown in Tables 2-4. 3.6. Calculation of Evaluation Indicators. Calculate the level of green development indicators from 2011 to2018. The formula is as follows:   Wireless Communications and Mobile Computing Growth rate of tertiary industry % Level of environmental bearing capacity X 10 Percentage of forest cover % X 11 Water resources per capita m 3 /per capita X 12 Fertilizer application per unit cultivated area t/hectare X 13 NOx emissions per unit land area t/km 2 X 14 Emissions so2 per unit land area t/km 2 X 15 so2 emissions per capita t/per capita Government support and green development X 16 Expenditure on environmental protection of share of fiscal expenditure % X 17 Science and technology of share of fiscal expenditure %

X 18
Municipal sewage treatment rate % X 19 Municipal solid waste disposal rate % X 20 Urban per capita park green area Hectare/per capita X 21 Public transport per 10,000 people in the city Traffic/ten thousand people

Interpretation of Result
The following can be seen from Tables 5-7.

Changes in Economic Growth and Green Development
Efficiency. During the period 2011-2018, the efficiency of economic growth and green development in Tai'an increased 2.14 times from 0.0312 in 2011 to 0.0667 in 2018. It can be seen that Tai'an has made remarkable achievements in the development of green economy in recent years. From the survey data, we can see that the per capita GDP of Tai'an is increasing from 2011 to 2018, energy consumption of GDP per unit area is decreasing, the emission of two major pollutants x3 and x4 is decreasing, and the construction land per unit area GDP is gradually decreasing [20]. This is mainly because Tai'an has advocated green development to drive economic and social development in the past 10 years, and the proposed low-carbon economy, circular development, energy saving, and emission reduction measures have achieved some results.

Changes in the Carrying Capacity of Resources and
Environment. From 2011 to 2018, the amount of fertilizer applied per unit cultivated land area in Tai'an was  Firstly, the Tai'an municipal government has made great efforts to establish a sanitary city and to save energy and reduce emissions in recent years. It has comprehensively rectified the water environment and air pollution and actively implemented the energy saving and emission reduction project. Secondly, the high quality development of its economy improves the bearing capacity of natural environment. Thirdly, people pay more attention to awareness of environmental protection gradually. In short, by 2018, the level of carrying capacity of resources and environment has increased 3.9 times.

Changes in Government Support and Green
Development. During 2011-2018, the proportion of environmental protection expenditure to total financial expenditure   in Tai'an was on the rise. It can be seen that the Tai' an government attaches great importance to the promotion of ecological environmental protection and green development. The promotion level of green development in Tai'an is rising year by year, which indicates that the support of Tai' an municipal government for green development is increasing year by year, and the achievements of building "green Tai'an" are remarkable.

Conclusion
From the above analysis, on the whole, we can see that the level of green development in Tai'an is on the rise, and it has made obvious achievements in economic growth and green development efficiency, environmental carrying capacity, and the level of municipal support. However, the water consumption per unit GDP is still high, the per capita water is decreasing, and the air quality is poor. This is also a problem to be solved in the process of promoting urban green development. It is recommended to do a good job in the following aspects to further promote the "Green Tai'an" urban construction.

Promoting Energy Conservation and Emission Reduction
(1) Build a clean, safe, and diversified energy industry system. Minimize coal pollution and encourage the power industry to focus on hydropower generation, actively promote nuclear power generation, and vigorously promote new energy generation. Promote power, steel, cement, and other industries to adopt clean production technology, reduce energy consumption, and reduce energy consumption [21] (2) Promote the prevention and control of air pollution and reduce the discharge of water pollutants and speed up the systematic construction of sewage purification plants in towns and streets

Strengthening Intensive Land Use
(1) Strengthen the protection of basic farmland. Implement the agricultural cultivated land protection sys-tem strictly, actively implement the demonstration project of farmland protection, and improve the quality of agricultural cultivated land (2) Control construction land strictly. Promote the compound utilization of underground space of industrial land in order to improve the utilization rate of industrial land. For new construction land, we should strictly control and give priority to the construction land for new "green" industrial projects encouraged by the government (3) Exploit mineral resources rationally. Pay attention to efficient production and proper disposal of waste, while improving the utilization rate of resources to achieve ecological restoration. Strict control of existing mining and other mining activities. Prohibit to carry out mineral resource development activities strictly in the classified special mining areas (4) Strengthen intensive use of resources. For the scarce resources, it is necessary to develop, utilize, and protect them in order to realize the parallel development of urban construction and ecological protection

Strengthening the Control and Protection of Water Resources
(1) Strictly control water resources. By strictly controlling the total water demand of each industry [6], put an end to excessive water use, promote intelligent agricultural irrigation technology, and improve water use efficiency (2) Encourage enterprises to carry out water-saving transformation. Through the improvement of water use and water saving, both industrial water consumption can be greatly reduced, and sewage discharge can be reduced. In particular, waterpower generation, chemical fuel oil, steel, and other industries with large water consumption, we must pay attention to the construction of water-saving facilities (3) Protect natural water bodies in rivers and lakes. We will strengthen the protection of such important natural water bodies as the Dawen River, the Dongping Lake, the Tianyi Lake, the Black Dragon Pool, and the Qingyun Lake and put an end to the reduction in the area of natural water bodies and the worsening of ecological conditions (4) Strengthen the management of groundwater resources. The exploitation and irrigation of groundwater and surface water should be arranged as a whole, and the degree of exploitation and irrigation of groundwater should be controlled strictly

Perfecting the Standard System of Green Certification.
Strictly enforce market access standards and energy-saving design standards for enterprises that consume high amounts of energy and emit high levels of emissions. Strictly enforce 8 Wireless Communications and Mobile Computing green production standards for enterprises and pollution control standards. Establish standards for water use in the water-using sector and improve the green certification system and carry out energy-saving, water-saving, environmental certification, and environmental management system certification.

Establishing and Improving Supporting Systems.
Strengthen the institutional construction of green Tai'an. The establishment of relevant legal protection system, green assessment and management system, environmental accountability, and reward system is the implementation of urban green development system guarantee. The green development of cities should be promoted by means of legalization, and the act of malicious destruction of the natural ecological environment hindering the green development should be given heavier punishment. Implement financial policies that are linked to the overall benefits of energy conservation and emission reduction, such as the reimbursement of specific emission reduction fees by relevant government departments if an enterprise completes its assigned emission reduction tasks within a certain period of time.

Data Availability
The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.

Conflicts of Interest
It is declared by the authors that this article is free of conflict of interest.