Research on Residents’ Willingness to Pay for Promoting the Green Development of Resource-Based Cities: A Case Study in Chifeng

: Resource-based cities have made signiﬁcant contributions to the development of human beings but have also accumulated various unsustainable ills. For this reason, China put forward the strategy of green development. This study used questionnaires to explore the extent of residents’ understanding of regional green development in Chifeng City and their willingness to support local green development, and further analyzed the differences in the residents’ attitudes and willingness to pay (WTP) with different socioeconomic characteristics. The results showed that most of the respondents supported the green development strategy and demonstrated a strong willingness to participate in regional green development investment. According to calculations, the per capita WTP for green development in Chifeng is 45.05 yuan/a (about 7 dollars/a, 5.7 euros/a). Urban residents, government employees, and well-educated respondents were more inclined to support regional green development and showed a greater WTP. Elderly and female respondents agreed more with the government’s green development promotion, while the young and middle-aged populations and men tended to have higher green development expenditures. The respondents’ annual income difference was reﬂected in the amounts of residents’ WTP. This study also offered scientiﬁc support and policy assistance to promote the environmental protection work from government-led to public participation.


Introduction
Resource-based cities are cities with good resource endowments, and the main share of industry and economic aggregates comes from resource and energy mining and processing [1]. Historically, resource-based cities have made significant contributions to human development, but in the long run, the unsustainable development model of resource-based cities has not only failed to efficiently develop local natural resources but has also led to accelerated deterioration of the ecological environment in the region, economic recession, and other problems, which greatly threatened the health of the residents [2][3][4][5][6]. The problems faced in the development of resource-based cities are closely related to policy guidance. As the main force in guiding the development and transformation of resourcebased cities, government agencies of various countries carried out long-term explorations of the development model of resource-based cities and successively proposed various solutions [7][8][9]. In 1987, the book "Our Common Future" provided a set of new theories and strategies for the coordinated development of nature, technology, economy, and society: the concept of sustainable development. This concept provided a new choice for the development of resource-based cities and humankind as a whole, and a new model of sustainable development of resource-based cities had emerged [10]. the regional green development process [17]. Although the government-led top-down approach may support the initial green development of resource-based cities, the success of the regional green development model and the sustainability of benefits depend on the main concerns of the various stakeholders (especially the public), involving many aspects such as funding, public awareness, and degree of recognition [18,19]. The Contingent Valuation Method (CVM) was originally proposed by Ciriacy-Wantrup and is often used to evaluate the economic value of non-competitive public goods such as environmental goods and services [20]. In the form of a questionnaire, CVM asks the respondents about the maximum willingness to pay (WTP) for using or protecting a given environmental item or service or the minimum willingness to accept (WTA) for the loss of a given environmental item or service. Large deviations of WTA from WTP can arise without perfect complementarity between the public good and the market goods [21], and WTP is closer to market value than WTA [22]. Therefore, understanding the public's attitude and willingness to pay (WTP) can provide important information to advance the green development of resource-based cities, which is conducive to the transition from a government-led model to a public participation model. However, relevant research is relatively scarce at present.
In summary, based on the green development goals of resource-based cities and residents' response to green development, this study used a questionnaire survey to explore the local residents' understanding of the green development of resource-based cities from the perspective of public perception, and employed the WTP survey as a starting point to explore the residents' response to the local green development path and the corresponding influencing factors. This study aimed to analyze the driving factors and behavioral characteristics of the public in resource-based cities in promoting local green development. Meanwhile this study put forward feasible suggestions to city managers from the perspective of public participation, so as to guide resource-based cities to coordinate the relationship between economic development and ecological environment and realize people-oriented regional green and coordinated development.

Questionnaire Design
The composition of the questionnaire is shown in Figure 1. It consists of four parts and a total of 50 questions, including the interviewee's personal information, feelings about the local ecological environment, understanding of green development, support for the green development of resource-based cities, and WTP and payment methods for green development of resource-based cities.

Study Area
At the end of 2013, the State Council of China issued the National Sustainable Development Plan for Resource-Based Cities (2013-2020), which, according to different types and evaluation criteria, divided resource-based cities into four types: growth, maturity, decline, and regeneration. This research identified Chifeng City, the only mature resource-based city among the four types of Inner Mongolia and the most populous city in Inner Mongolia, as the research area. Chifeng is an important energy raw material base in China: 83 types of mineral resources and more than 1600 mineral deposits have been discovered in the city. Chifeng has a special geographical location and is a crucial part of China's important ecological security barrier [23]. However, it should not be overlooked that Chifeng also has a common problem with many resource-based cities. The gradual reduction of natural resources has led to imbalances in the urban industrial structure, increased poverty and unemployment in resource-depleted areas, lack of alternative industries, and serious environmental pollution [24][25][26]. Consequently, taking Chifeng as the research area has a certain representativeness for the research into the green development of resource-based cities in China. has a certain representativeness for the research into the green development of resourcebased cities in China.

Determination of Sample Size
The total population of Chifeng City was 4.518 million in 2018. Due to the large total number, the statistical confidence method was used to estimate the sample size. In the case where the overall sample size has reached millions, the relationship between the minimum sample size and the overall sample size has no significant correlation, but it is affected by the error and confidence level. According to the data given by American market research expert Alan Dutka, when sampling with a 3% error and 95% confidence level, the minimum sample size is 1068. In this study, samples were taken with an error of 2% and a confidence level of 95%, and the minimum sample size calculated was 2401 [27]. A face-to-face questionnaire survey of 2500 local residents of Chifeng City over the age of 17 was conducted to meet the survey requirements with high reliability. The selection of interviewees followed the principle of randomness. Random questionnaire surveys were conducted on residents of Chifeng in the urban districts, communities, and villages. The number of questionnaires returned by each district and county is represented in Figure 2.

Determination of Sample Size
The total population of Chifeng City was 4.518 million in 2018. Due to the large total number, the statistical confidence method was used to estimate the sample size. In the case where the overall sample size has reached millions, the relationship between the minimum sample size and the overall sample size has no significant correlation, but it is affected by the error and confidence level. According to the data given by American market research expert Alan Dutka, when sampling with a 3% error and 95% confidence level, the minimum sample size is 1068. In this study, samples were taken with an error of 2% and a confidence level of 95%, and the minimum sample size calculated was 2401 [27]. A face-to-face questionnaire survey of 2500 local residents of Chifeng City over the age of 17 was conducted to meet the survey requirements with high reliability. The selection of interviewees followed the principle of randomness. Random questionnaire surveys were conducted on residents of Chifeng in the urban districts, communities, and villages. The number of questionnaires returned by each district and county is represented in Figure 2.
From July to December 2019, random sampling was conducted in Chifeng City to investigate the residents' WTP for green development strategies, and respondents were asked to complete the questionnaire voluntarily. The answer time of the questionnaire was about 20 min. Specifically, a total of 3498 questionnaires was distributed. The questionnaire survey was conducted through face-to-face interviews. The questionnaires were distributed on-site, with a recovery rate of 100%. Among them, there are 2609 valid questionnaires and 889 invalid questionnaires (abandonment criteria: more than 10% of the questions are not answered, the handwriting is scribbled and unrecognizable, and the same answer is selected continuously, etc.). The overall effective rate of the questionnaire is 74.59%. From July to December 2019, random sampling was conducted in Chifeng City to investigate the residents' WTP for green development strategies, and respondents were asked to complete the questionnaire voluntarily. The answer time of the questionnaire was about 20 min. Specifically, a total of 3498 questionnaires was distributed. The questionnaire survey was conducted through face-to-face interviews. The questionnaires were distributed on-site, with a recovery rate of 100%. Among them, there are 2609 valid questionnaires and 889 invalid questionnaires (abandonment criteria: more than 10% of the questions are not answered, the handwriting is scribbled and unrecognizable, and the same answer is selected continuously, etc.). The overall effective rate of the questionnaire is 74.59%.

Reliability Test
Reliability analysis is often expressed by correlation coefficients, including test-retest reliability, alternative-form reliability, and Cronbach's alpha. Test-retest reliability refers to the testing of the same group of participants with the same questionnaire at different times and the calculation of the correlation coefficient of the two points. Alternative-form reliability refers to the testing of the same group of participants with a similar copy of the questionnaire and the calculation of the two copies of the correlation coefficient of the scores. The Cronbach's alpha indicates the degree of reliability of internal consistency. The formula for the calculation is as follows: where S is the internal variance of the question i, S is the variance of the total score of all questions, and k is the number of options in the questionnaire. Cronbach's α is used

Reliability Test
Reliability analysis is often expressed by correlation coefficients, including test-retest reliability, alternative-form reliability, and Cronbach's alpha. Test-retest reliability refers to the testing of the same group of participants with the same questionnaire at different times and the calculation of the correlation coefficient of the two points. Alternative-form reliability refers to the testing of the same group of participants with a similar copy of the questionnaire and the calculation of the two copies of the correlation coefficient of the scores. The Cronbach's alpha indicates the degree of reliability of internal consistency. The formula for the calculation is as follows: where S 2 i is the internal variance of the question i, S 2 x is the variance of the total score of all questions, and k is the number of options in the questionnaire. Cronbach's α is used to measure the consistency of the scores among the various questions within the questionnaire, and it is suitable for the reliability analysis of attitude and opinion questionnaires [28], as shown in Table 1.
In this study, the questionnaire does not involve retesting, nor does it allow one participant to fill in two copies of the questionnaire. Therefore, the Cronbach's alpha was used to measure the reliability. The sociological statistical software SPSS was used to analyze the reliability of the eight questions about the residents' ecological environment perception in the questionnaire, and the Cronbach's alpha coefficient calculated was 0.90, which proved that the results of the questionnaire for the green development strategy of Chifeng City have good consistency and stability.  [29]. Studies have shown that there is a substantial hypothetical bias (the difference between hypothetical and actual values) of 21% on average in WTP measures, and direct methods result in more accurate estimates of WTP than indirect methods do [30]. In this paper, the PC approach was used to reveal respondents' WTP for green development because the respondents' WTP can be directly determined from the original data. The Minimal Legal WTP Model (WTP ML ) was occupied to calculate the WTP. The advantage of the WTP ML model is its transparency and it rests on a contractual notion of WTP [31]. WTP ML can be considered a lower bound for the WTP [32]. The calculation formula of WTP ML is: where A i is the different values from the payment card and P i is the respective frequencies.

Residents' Attitude towards Green Development and Analysis of Factors Affecting the Payment Amount
The PC approach was used in this study and the responses were interval-censored, so we used interval regression [33] to analyze the WTP for green development of residents with different socioeconomic characteristics. The willingness to pay interval is 0, (0,50], (50,100], (100,200], and (200,+∞).
Further, the method of one-way analysis of variance (ANOVA) was selected in this study to explore the attitudes of residents with different characteristics to green development and their WTP for regional green development. The explanatory variables are the socioeconomic characteristics of residents, covering the gender, age, household registration, occupation, education level, and annual income of the participants. The statistical descriptions related to the variables are presented in Table 2.
The ANOVA decomposes the total sum of squares into the sum of squares between groups and the sum of squares within groups, as depicted in Formulas (3) and (4). By dividing the different square sums by the degrees of freedom, the mean square error (Formula (5)) is obtained, and the F test is performed based on the mean square error (Formula (6)). The purpose of the F test is to infer whether there is a significant difference between various levels under a certain population characteristic. The null hypothesis, H 0 , represents that there is no significant difference among levels. If F < F_0.05 (p > 0.05), accept H 0 ; otherwise, reject H 0 . In addition, based on the sample average, this study compared residents' approval for green development and their WTP for regional green development under different population characteristics. The higher the average, the higher the degree of approval or the stronger the WTP.
where SST, SSR, and SSE are the sum of squares total, sum of squares regression, and sum of squares error, respectively. x is the overall sample average under the resident characteristic A, x ij is the sample average at a certain level under the public characteristic A, n is the number of samples, k is the number of groups, MST, MSR, and MSE represent mean squared total, mean squared regression, mean squared error respectively, and df T , df R , and df E are their degrees of freedom, correspondingly.

Basic Situation of the Questionnaire Survey
This survey covered the whole area of Chifeng City, involving Hongshan district, Songshan district, Yuanbaoshan district, Linxi county, Ningcheng county, Aluhorqin banner, Balin left banner, Balin right banner, Keshiketeng banner, Wengniute banner, Kalaqin banner, and Aohan banner. From the basic situation of the respondents (Table 3), the majority of respondents are female with their age distribution mostly concentrated between 17 and 49 years old (accounting for 75.1%). Only 12.3% of the respondents are over 61 years old. The respondents are in good health, and their education level is mostly technical secondary school and college, followed by undergraduate. Respondents with an annual income of less than 50 thousand yuan accounted for 54.7%, followed by those with an income of between 50 and 100 thousand yuan accounting for 35.6%, and those with an income of more than 100 thousand yuan accounted for only 9%. Among the occupation types, 51.4% of the respondents had fixed income (government officer, technical worker, business staff, and private business owner), and 48.6% of respondents were employed in the second and third industries.

Respondents' Perceptions of Regional Ecological Environment Protection and Green Development
The results revealed that 81% of the respondents are concerned about the information related to the ecological environment of Chifeng ( Figure 3a) and expressed concern about the current status of the local ecological environment (Figure 4). Based on the responses of the public about their perceptions of changes in the air quality, water environment, soil environment, noise environment, and garbage disposal in Chifeng in the past five years, it was found that the vast majority of respondents expressed deep concerns about the deterioration of the air, water, and noise environments. Almost 44% of the respondents considered that the soil environment in the region has exhibited a worsening trend in the past five years. Due to the comprehensive improvement of the urban and rural environment over the years, nearly 30% of the respondents thought that the garbage disposal had improved, but 43% of the respondents asserted that the overall garbage environment in the region had deteriorated. In general, virtually half of the respondents believed that the recent changes in trend of the ecological environment in Chifeng in the past five years was not ideal, and effective measures were urgently needed to improve the basic status of the ecological environment in the region. The public's attention to the ecological environment is related to the channels through which they obtain relevant information. As illustrated in Figure 3b, more than half of the respondents believed that online news was the main channel to learn about ecological and environmental protection. The internet (55%) and television (TV) news (25.3%) are the main ways for residents to obtain information about the ecological environment, followed by daily communication (17.1%), newspaper, and radio. It can be vividly observed that new media represented by the Internet and TV are the main channels for residents to obtain information on ecological and environmental protection and are also the major means for information dissemination and sensitization about green development compared with traditional media.     Furthermore, the degree of concern for the ecological environment and the urgency to change the current reality have greatly promoted the respondents' demands for the transformation of regional development models. Green development, as a new path of resource-based city transformation advocated by the country, is gradually entering the public's field of vision. Through the questionnaire survey, approximately 30% of the respondents expressed concern and understanding of the concept of green development. However, more than 70% of those surveyed believe that they have an iota of knowledge of green development-related theories (as shown in Figure 3c), reflecting that the concept of green development is relatively new to the people in the region and there is still a need to strengthen publicity and dissemination. After the investigators explained in detail the connotation of green development, greater than 80% of the respondents agreed with the green development of resource-based cities, some of the respondents held a neutral attitude, and only 2.2% of the respondents opposed (Figure 3d). With regards to effective ways of promoting green development, nearly 60% of the interviewees believed that the government's policies and regulations were the most important way forward, followed by advocating green consumption patterns and encouraging the development of public transportation. Moreover, raising public awareness of the environment and increasing publicity and education are also powerful means of promoting the transformation of regional green development ( Figure 5). In terms of funding for green development, more respondents were likely to invest in urban human settlements compared to energy structure transformation and industrial pollutant control, accounting for 57.8% of the total ( Figure 6). The above results show that the public's intention to support the regional green development process is to effectively improve their own quality of life. Whether the quality of life and happiness of residents has been improved is also the key to assessing the success of green development [34]. terms of funding for green development, more respondents were likely to invest in urban human settlements compared to energy structure transformation and industrial pollutant control, accounting for 57.8% of the total (Figure 6). The above results show that the public's intention to support the regional green development process is to effectively improve their own quality of life. Whether the quality of life and happiness of residents has been improved is also the key to assessing the success of green development [34].

Analysis of Respondents' WTP for Green Development
The cost that residents are willing to pay for their resource-based city to promote green development is the main focus of this research. According to statistics (Figure 7), among the 80.4% of the residents who agreed to pay, 38.56%, 31.97%, 18.66%, and 10.70% of the residents were willing to pay 0-50 yuan, 50-100 yuan, 100-200 yuan, and over 200 yuan respectively, to promote regional green development. Using the lower limit of the interval as the payment value, the calculated minimal public's per capita WTP for green development is 45.05 yuan/a (about 7 dollars/a, 5.7 euros/a). A study on the WTP by Zhengzhou residents in the water-receiving area of the Middle Route of the South-to-

Analysis of Respondents' WTP for Green Development
The cost that residents are willing to pay for their resource-based city to promote green development is the main focus of this research. According to statistics (Figure 7), among the 80.4% of the residents who agreed to pay, 38.56%, 31.97%, 18.66%, and 10.70% of the residents were willing to pay 0-50 yuan, 50-100 yuan, 100-200 yuan, and over 200 yuan respectively, to promote regional green development. Using the lower limit of the interval as the payment value, the calculated minimal public's per capita WTP for green development is 45.05 yuan/a (about 7 dollars/a, 5.7 euros/a). A study on the WTP by Zhengzhou residents in the water-receiving area of the Middle Route of the South-to-North Water Transfer Project found that the highest per capita WTP was 99.48 yuan/year [35]. Xu et al. calculated and analyzed the WTP of the residents of the Liaohe River Basin and discovered that the per capita WTP was 160.72 yuan/year [36]. Compared with other research outcomes, the WTP obtained in this study is at a relatively low level. studies [38]. Except for the main reason that people's personal financial ability to pay is insufficient, some residents subscribed to the fact that paying for environmental services is not their own obligation and should be solely handled by the government.  "--" means that the data had no need for calculation. "Government funding" means that the work should be funded by the government and not by individuals. Table 5 shows the coefficient results of interval regression of the respondents' WTP for green development, and the values in parentheses are the standard errors. The first column of Table 5 shows the regression results of the full sample. Given the 19.6% of zero WTP responses, we ran a hurdle model specification [33]. Firstly, we estimated the prob- On the one hand, this is related to factors such as the relatively new concept of green development in the region, the lack of acceptance by residents, and the relatively lowincome level in underdeveloped areas. On the other hand, the possibility of an increase in residents' WTP can be observed. With the smooth development of related work, after the public receives the dividends of green development, the bottom-up investment in ecological and environmental protection of the residents will inevitably become one of the strong driving forces for regional green development. Estimating with the population of Chifeng City in 2018, the total willingness of residents to pay exceeds 200 million yuan per year, representing 16% of the total investment in ecological environment protection of the Chifeng government that year. Although the actual total amount of WTP may be lower than this ratio because the hypothetical bias exists and the questionnaire survey strategy may affect WTP, the WTP is still considerable [30,37]. Therefore, relevant departments urgently need to explore the potential of residents to respond to green development in order to accelerate the process of the regional green development. Besides, as is depicted in Table 4, only 19.6% of residents indicated that they were unwilling to pay for the green development in their cities. The reasons for their refusal to pay were similar to the results obtained from previous studies [38]. Except for the main reason that people's personal financial ability to pay is insufficient, some residents subscribed to the fact that paying for environmental services is not their own obligation and should be solely handled by the government. "--" means that the data had no need for calculation. "Government funding" means that the work should be funded by the government and not by individuals. Table 5 shows the coefficient results of interval regression of the respondents' WTP for green development, and the values in parentheses are the standard errors. The first column of Table 5 shows the regression results of the full sample. Given the 19.6% of zero WTP responses, we ran a hurdle model specification [33]. Firstly, we estimated the probability that a respondent reports WTP greater than zero using probit regression (the second column) and then estimated WTP conditional level on such participation using interval regression (the third column). The results showed that the gender, household registration, education level, and annual income of residents significantly impact the WTP for green development. Annual income has the greatest impact on WTP, followed by gender, education level, and household registration. A more detailed analysis of these determinants is presented in Section 3.5. *, **, and *** denote statistical significance at the 10%, 5%, and 1% levels.

The Impact of Respondents' Socioeconomic Characteristics on Their Attitudes towards Green Development in Resource-Based Cities
This survey investigated the attitudes of residents of resource-based cities with different characteristics to the government's promotion of the regional green development. Based on a one-way ANOVA, the study found that respondents of different gender, age, household registration, occupation, education level, and annual income had different attitudes. Mathematical proofs of the results are added as appendices (Table A1-Table A4).
In terms of gender, women are more supportive of regional green development than men. In terms of age, based on multiple comparative analysis, it was found that the older the respondents are, the more they agree with the government's promotion of green development, except for the age group of 50-60 and above 60. There are significant differences in the public's attitudes towards the green development in different household registration areas. In comparison with suburban and rural residents, urban residents are more inclined to support regional green development transformation. Women and the elderly are more concerned about or more likely to have a relatively superior personal living environment. In addition, urban residents have more obvious advantages than suburban and rural residents. It is this kind of concern for their own living environment and quality that makes the above-mentioned people more equipped with the subjective and objective conditions to take care of the environment in which they live.
Respondents of different occupations have significant differences in attitudes towards the government's promotion of green development. Government officials and private business owners have a strong tendency towards green development. As the main pioneer of regional green development, government officials are more proactive in regional green development because they are more in tune with relevant policy theories. According to the average scores of groups with different levels of education, we believe that the higher the level of education, the higher the degree of approval of the government to promote of green development. Based on prior research findings, education plays a vital role in shaping values, thereby affecting people's cognition and acceptance. Generally, educated people have more understanding of green development and are very inclined to make more environmentally conscious choices.
There are no significant differences in the ANOVA for groups of people with different annual income. The difference in annual income does not affect their common understanding of promoting green regional development and transformation. This is inseparable from the widespread dissemination of ecological civilization thoughts in China in recent years as well as the urgent need for all residents to improve the quality of the ecological environment in the region.

The Impact of Respondents' Socioeconomic Characteristics on Residents' WTP
Respondents of different genders, ages, household registrations, occupations, education levels, and annual income levels had different WTP for green development. In contrast with women, men have higher WTP, which may be closely related to men's possession of more social resources. Different age groups exhibited different WTP for regional green development. The young and middle-aged groups (17-49 years old) are more inclined to invest in the regional green development, while the elderly groups with higher paying ability (above 50 years old) showed a weak WTP. This may be attributed to the respondents' growth background and education. Respondents aged 17-49 are mostly open-minded, easy to accept new things, and have a certain income base, so they tend to show a relatively high level of payment. This is more evident in the age group of 28-38. Respondents over 50 years of age are relatively conservative in their thinking, with declining income expectations, so their payment amount is relatively low [39]. The public's readiness to pay for green development in different household registration locations differs significantly. Compared with suburban and rural residents, urban residents have a more significant intention to pay higher amounts, which is strongly connected to their higher income and their more convenient access to information. Furthermore, the enthusiasm to pay by different occupational groups also revealed substantial differences. Besides, government officers and business staff with stable jobs and ample income have relatively higher WTP, while farmers, service personnel, and retired groups also indicated concern for regional green development, and their WTP is relatively low due to unstable income sources. The mathematical proofs of the above results are added as appendices (Tables A5-A8).
Education level is also an important factor affecting the tendency to pay. As exemplified in Figure 8, respondents with an education level of elementary school and below are eager to pay much less for urban green development than other groups. With the increase in the education level, the inclination to pay has increased significantly. Education has been proven to be a principal factor influencing people's behaviors and opinions [40]. A well-educated person may have a comprehensive understanding of the importance of environmental issues [41]. There is a positive correlation between annual income level and WTP. Respondents with higher annual income are more willing to contribute greater portion of their income for regional green development. As illustrated in Figure 9, respondents with the annual income of more than 150 thousand yuan have the highest tendency to pay, which is three times higher than those with an annual income of less than 50 thousand yuan. Previous research has also reported that people with higher incomes are enthusiastic to pay for environmental-related issues, which is as a result of their high level of information literacy [42,43]. There is a positive correlation between annual income level and WTP. Respondents with higher annual income are more willing to contribute greater portion of their income for regional green development. As illustrated in Figure 9, respondents with the annual income of more than 150 thousand yuan have the highest tendency to pay, which is three times higher than those with an annual income of less than 50 thousand yuan. Previous research has also reported that people with higher incomes are enthusiastic to pay for environmental-related issues, which is as a result of their high level of information literacy [42,43].
The results of the ANOVA and multiple comparisons showed that urban residents, government officers, and well-educated respondents were keen to support regional green development and showed a strong WTP. The elderly and female respondents highly support the promotion of regional green development process, while men, middle-aged, and young people demonstrated higher WTP for green development. The difference in the annual income of the respondents is not reflected in their common perception of promoting green development in the region, but rather in the amount of their WTP. By analyzing the residents' "attitude towards government's promotion of regional green development" and "WTP for green development", it was discovered that there are two different processes, which need to be analyzed and treated separately. Residents' attitude towards the government's promotion of regional green development depends more on residents' demands for maintaining and obtaining a higher quality of life. The better the living environment, the more secure the job is, the better the living environment for individuals, the more subjective and objective conditions for caring about the environment in which they live, which are more prominent in both elderly and female respondents [44]. The public's recognition and acceptance of green development (related to education level) are the key prerequisites for residents to support regional green development and be ready to invest in it. On this basis, the respondents' own income expectations and capability to pay are the key factors affecting the amount of payment.
There is a positive correlation between annual income level and WTP. Respondents with higher annual income are more willing to contribute greater portion of their income for regional green development. As illustrated in Figure 9, respondents with the annual income of more than 150 thousand yuan have the highest tendency to pay, which is three times higher than those with an annual income of less than 50 thousand yuan. Previous research has also reported that people with higher incomes are enthusiastic to pay for environmental-related issues, which is as a result of their high level of information literacy [42,43].

Respondents' Preference for Green Development Payment Forms
The study of residents who are willing to pay found out that these residents mostly prefer the form of payment by public fundraising (764 respondents), followed by uniform distribution after paying taxes to the country (616 respondents), and then cash or transfer to the local government environmental protection department (511 respondents). Some residents chose more than one option. Education level has a direct impact on the choice of payment methods. Respondents with higher education are more inclined to choose two methods: paying taxes and submitting them to government environmental protection departments. Respondents with middle school education and below had a preference to pay property fees to the community. Age is also one of the important factors that affect the choice of payment methods. In contrast with other groups, the elderly group (above 61 years old) does not want to pay by taxation. In addition, this study also conducted a survey on the compensation methods that residents hope to receive after participating in the regional green development process. It turned out that in terms of compensation strategies, residents prefer eco-tourism discounts, followed by personal work performance, and then personal credit systems.

Conclusions
Resource-based cities have made great contributions to human development, but the various unsustainable ills that have accumulated in the process of historical development have caused great harm to human survival and development. China is therefore proposing a green development strategy to improve the green sustainable development capabilities of regions including resource-based cities. However, most of the current research on green development is based on a top-down perspective, and few studies have focused on the public's response to the regional green development. From the public perspective, this study conducted a questionnaire survey in Chifeng, a typical resource-based city in Inner Mongolia, China, with the aim of exploring the local residents' understanding of the green development of resource-based cities and evaluating the potential investment of residents on the local green development. The main findings of this study are as follows: (1) Although the majority of interviewees in the region were concerned with ecological and environmental protection, their understanding of green development needs to be strengthened. Most interviewees supported the implementation of green development strategies in the region, but still believed that top-down government investment should be the main source of funding. However, the general public has also expressed their strong willingness to participate in regional green development investments. (2) According to calculations, the per capita WTP for "green development" in Chifeng City is 45.05 Chinese yuan (about 7 USD, 5.7 EUR) per year. Based on this estimate, the total bottom-up WTP of Chifeng residents will exceed 200 million yuan per year, accounting for 16% of the total investment in environmental protection in Chifeng throughout the year. It can be glaringly clear that residents have great potential to respond to the regional green development strategy.
(3) Urban residents, government employees, and well-educated respondents were more likely to support regional green development and showed a greater WTP, which suggests that enhancing public environmental education and providing accessible environmental knowledge is essential for green development. Elderly and female respondents were more in agreement with the government's promotion of regional green development, while the young and middle-aged populations and men tended to have higher personal green development expenditures. The difference in annual income of the interviewees was not directly reflected in the residents' common perception of promoting regional green development, but rather in the amounts of residents' WTP. (4) Residents' attitude to the government's promotion of regional green development depends more on residents' demands for maintaining and achieving a higher quality of life, and the public's recognition and acceptance of green development are key prerequisites for residents to support and invest in regional green development. On this basis, the income expectations and ability of residents to pay are the main factors affecting the amount of the payment. (5) Public fundraising is a more preferred form of green development payment for Chifeng residents, while education level and age are key factors influencing the choice of payment methods for green development by residents.

Policy Recommendations
(1) Improve policy legislation and increase the residents' enthusiasm for participation. The successful transformation of the green development of resource-based cities is inseparable from sound policies and incentive reward mechanisms. In the context of a systematic green development project, the government should play an active role in improving relevant policies and legislation and set up an incentive reward mechanism to increase public participation and broaden the source of regional green development funds. At the same time, a combination of decentralization, management, and service should be provided to the relevant management agencies not only to ensure a healthy and orderly transformation of regional green development, but also to attract the masses to participate in related construction. In this way, the sense of ownership of the public is improved, and the government management is transformed from a regulatory government to a service-oriented government [45]. (2) Introduce market mechanisms to stimulate the enthusiasm for the participation of residents. Results have shown that the majority of respondents exhibited a positive WTP for regional green development, and the amount of payment is higher compared with similar research findings. As a result, changing the traditional mode of top-down government investment in green development has practical feasibility and a broad public opinion foundation. The introduction of a market-oriented operation mode is an effective way of promoting regional green development in the new stage. Private capital participation and a market-oriented operating model will not only reduce the local government capital investment in regional green development but will also ensure a stable source of funding. Moreover, it generates income for the general public and promotes the potential of their eagerness to pay, which will lay a solid foundation for the orderly transformation of regional green development.
(3) Strengthen education and dissemination of information on green development. Green development has become a national strategy for the transformation of China's resourcebased cities. Public participation and fundraising are very important in the implementation of green development. Green development education should be strengthened in order to promote public participation. In addition to vigorously enhancing the information dissemination capacity of new media such as the internet, TV, and radio, diverse advertising activities should also be utilized to broaden the channels of information dissemination. The content of the promotion should not only be the definition and connotation of green development but should also emphasize the economic and environmental benefits of green development for residents. The dissemination of information should be carried out not only by government agencies and decision makers, but also by other stakeholders (such as non-governmental organizations, universities, and enterprises) in order to call on more social groups and residents to participate in the regional green development process, creating a new situation in which multiple actors work together to promote the construction of regional ecological civilization.
Author Contributions: G.W., Y.Z., M.Z., and X.Z. conceived the general idea of the paper. M.Z., C.W., and X.Z. designed the questionnaire. All authors analyzed and discussed the results. M.Z., X.Z., and C.W. wrote this paper. All authors have read and agreed to the published version of the manuscript. Institutional Review Board Statement: Not applicable.

Informed Consent Statement:
Informed consent was obtained from all subjects in-volved in the study.

Data Availability Statement:
The data presented in this study are available on suitable demand.

Conflicts of Interest:
The authors declare no conflict of interest.
Appendix A

Annual income (yuan)
<50,000 --50,000-100,000 --100,000-150,000 -->150,000 -- The higher the average score, the stronger the willingness to promote green development. There is no difference in the attitude towards the government's promotion of green development among respondents with different annual incomes, so the average value is empty.  The significance level of the mean is 0.05 * Dunnett's t test treats one group as a control group and compares it with all other groups.  The significance level of the mean is 0.05. * Dunnett's t test treats one group as a control group and compares it with all other groups.