Energy and Ecological Sustainability : Challenges and Panoramas in Belt and Road Initiative Countries

Innovation and globalization fosters a tendency towards multiparty collaboration and strategic contacts among nations. A similar path was followed by the Chinese administration in 2013, with its “Belt and Road Initiative” (BRI). The most important objective of the present fact-finding study was to demonstrate the links between economic growth, energy consumption, urbanization, gross fixed capital formation, trade openness, financial development and carbon emissions (ecological degradation) from a panel of 47 BRI economies, over a time span of 1980 to 2016. Dynamic panel estimations (dynamic ordinary least square (DOLS) and fully modified ordinary least square (FMOLS)) were engaged to examine the long-run links between the subjected variables. Synchronized outcomes for the full panel show that energy consumption, gross fixed capital formation, economic growth, financial development, and urbanization unfavorably led to environmental degradation (CO2 emissions). However, trade openness is negatively correlated with emissions. Furthermore, pairwise panel Granger causative estimations justified bi-directional links from all regressors towards CO2 emissions, except for trade openness, which had unidirectional ties with environmental quality. In cross-country, long-run assessments, different results were found, with CO2 emissions being greatly increased by economic growth in all countries and energy consumption in 30 countries; other predictors testified to some mixed interactions with CO2 emissions in the country-level examination. The reported investigation provides some noteworthy guiding principles and policy inferences aimed at governments and ecological supervisory administrations, suggesting assertive moves towards truncated used of carbon fossil fuels and dependency on renewable energy, establishing waste and water treatment plants, familiarizing themselves with the concept of a green economy, and making the general public aware of eco-friendly investments in BRI economies.


Introduction
The Belt and Road Initiative (BRI) is a connector that encompasses 68 countries, representing 65 percent of the total world population.The initiative helps countries share technologies, resources, but then surged until 2012.BRI economies have the same intensity trend in CO2 emissions.If only counting China, the respective level of global CO2 emissions in BRI nations has reached approximately 61.4% [17].Furthermore, the proportion of energy-intensive CO2 emissions in BRI economies is about 80%, indicating the crucial contributions of the energy sector to environmental degradation.On this basis, it is hard to escape the conclusion that BRI projects are going to harm the environment, as well as being beneficial for economic growth.In addition, a few researchers have also asserted that the "global shifting wave" of BRI projects would produce severe undesirable influences on indigenous resources and ecosystems [18].As such, it has become one of the major issues affecting the success of BRI projects in bounded economies.Previous studies have reported a significant relationship between economic growth, financial development, and carbon emissions.Grossman and Krueger [20] presented the well-known environmental Kuznets curve (EKC), which is an inverted U shape.It states that during the initial stage of economic growth, policymakers mostly focus on growth rather than environmental degradation.The second stage of economic growth reduces the pace of pollutant emissions.In the third stage, policymakers introduce environmentally friendly policies such as industrial treatment plants, renewable energy consumption, energy-efficient technologies, etc., which lower GHG emissions.Previous studies can be divided into two categories.Some support the EKC hypothesis [9,[21][22][23][24].The authors in [24] analyzed panel data from 40 Asian countries, and their estimations confirmed the inverted U-shaped curve.Likewise, [21] confirmed evidence of the EKC hypothesis in the case of 36 high-income countries.By contrast, some researchers report the nonexistence of the EKC hypothesis.The authors in [25][26][27][28] attempted to examine the EKC hypothesis and reported conflicting results.In the same vein, [25] used the panel data approach and confirmed weak evidence of the EKC hypothesis.Later, the findings in [27] also negated the EKC hypothesis.There are several key reasons for these conflicting pieces of evidence, such as there being no fundamental environmental theory, but most of the research is based on Kuznets' seminal work examining the inverted U-shaped curve [29].Other significant reasons for a variation in the EKC results are the use of different datasets, and the utilization of various econometric techniques and conditions.However, Figure 1.Carbon emissions of selected Belt and Road Initiative countries and the world.Source: [19].
Previous studies have reported a significant relationship between economic growth, financial development, and carbon emissions.Grossman and Krueger [20] presented the well-known environmental Kuznets curve (EKC), which is an inverted U shape.It states that during the initial stage of economic growth, policymakers mostly focus on growth rather than environmental degradation.The second stage of economic growth reduces the pace of pollutant emissions.In the third stage, policymakers introduce environmentally friendly policies such as industrial treatment plants, renewable energy consumption, energy-efficient technologies, etc., which lower GHG emissions.Previous studies can be divided into two categories.Some support the EKC hypothesis [9,[21][22][23][24].The authors in [24] analyzed panel data from 40 Asian countries, and their estimations confirmed the inverted U-shaped curve.Likewise, [21] confirmed evidence of the EKC hypothesis in the case of 36 high-income countries.By contrast, some researchers report the nonexistence of the EKC hypothesis.The authors in [25][26][27][28] attempted to examine the EKC hypothesis and reported conflicting results.In the same vein, [25] used the panel data approach and confirmed weak evidence of the EKC hypothesis.Later, the findings in [27] also negated the EKC hypothesis.There are several key reasons for these conflicting pieces of evidence, such as there being no fundamental environmental theory, but most of the research is based on Kuznets' seminal work examining the inverted U-shaped curve [29].Other significant reasons for a variation in the EKC results are the use of different datasets, and the utilization of various econometric techniques and conditions.However, [10,11] suggested that the ideal way to examine the existence of the EKC hypothesis across the world is to remove cross-sectional independence, normalize the responses for each country and the use the same econometric techniques to analyze the short-run and long-run relationships.
Recent literature has extended the EKC model by incorporating different factors such as technological innovation, financial development, industrialization, urbanization, etc.The authors in [15,30] found a significant and positive relationship between urbanization and energy consumption, which further leads to higher carbon emissions.The findings show that more than 50 percent of the population of the world is living in urban areas that are responsible for around 70 percent of GHGs.Some researchers have reported similar results [31][32][33][34][35][36][37][38][39][40][41][42].Reference [34] reported that an increase in family income and family size has led to an increase in carbon emissions in selected regions of China.The authors in [43] documented that higher urbanization is one of the main causes of carbon emissions.The authors in [34] investigated urban-and rural-based household carbon emissions and confirmed that urban-based carbon emissions are higher than rural-based carbon emissions, with 0.50 tCO 2 and 0.22 tCO 2 , for urban-and rural-based emissions, respectively.References [44,45] suggested that the government should increase forest investment, implement sound policies and adequately audit resources to control the environmental degradation process.Reference [5] used three-data envelopment analysis to examine the total factor energy efficiency of 35 BRI countries.The findings showed that countries with low energy efficiency have higher emissions.The authors in [46] investigated the empirical relationship between energy consumption, income, carbon emissions, capital formation and labor.In the context of low carbon (CO 2 ) endorsement, it is necessary to place sufficient significance on efficient progress to attain harmonized and ecological sustainability in various segments, namely energy usage, trade, technological investment, urbanization, labor and capital speculation (financial development and gross fixed capital formation, etc.).
The previous literature misses the impact of BRI projects on economic growth, energy consumption patterns and their harmful effects on the environment.This is a gap in the existing literature, which implies that no novel research has been proposed to consider a panel investigation based on 47 BRI economies with a cross-country analysis.The noteworthy objective of the present fact-finding study is to validate the links between economic growth, energy consumption, urbanization, gross fixed capital formation, trade openness, financial development and carbon emissions (ecological degradation) across a panel of 47 BRI economies, using a time span from 1980 to 2016.Various panel unit root tests have been undertaken to identify the level of stationarity among the variables, and subsequently the stationary level of panel cointegration tests required to gauge the level of integration among them.Hence, the cointegration patterns of dynamic panel estimations (dynamic ordinary least square (DOLS) and fully modified ordinary least square (FMOLS)) were suggested to examine the long-run linkages among the subjected variables.Furthermore, pairwise panel Granger causative tests were employed to assess the pattern of the directional links from all regressors towards CO 2 emissions.In cross-country, long-run assessments, some mixed interactions have been determined from regressors towards CO 2 .Based on retrieved estimations, there could be some policy implications for the full panel and individual countries, to address the energy, economy and ecological potentials and future encounters.Subsequently, the estimations have led to solid strategic recommendations and inferences for governments and policy-makers in terms of sound governance, waste management plans, renewable energy dependency and the undertaking of necessary decisions to sanitize the environment.
Section 2 comprises research methodologies, data collection, and details; Section 3 contains the results and discussion.Section 4 deals with conclusions, policy implications and recommendations.

Variables and Data Informers
The current investigation involved those 47 BRI countries depicted in Appendix B, Table A2.The panel selection of the 47 economies was determined based on the availability of a dataset from the World Development Indicators [19].The BRI was initiated by the Chinese government, to articulate the slogan "Going global through bilateral relationships" [47,48].The fruition and sustainability of an economy depends on all sectors participating in economic activities.Such contributions could comprise capital investment, urbanization, trade openness, labor operations, gross domestic product (GDP), ecological sustainability and energy utilization.Furthermore, these are all mandatory in order to accelerate economic progress and achieve sustainability.The BRI encompasses more than 68 countries, allowing an understanding of the demand and supply of energy in project operations, sustainable development, ecological sustainability, business and trade collaboration, infrastructure development and much more.Therefore, based on the discussions mentioned earlier, it is essential to assess future challenges and outlooks for the BRI to succeed in all areas.Thus, the present study uses carbon emissions (CO 2 ) as a predicted variable to determine ecological sustainability.The independent variables are specified as energy consumption, economic growth (GDP), urbanization, financial development, gross fixed capital formation and trade openness, as shown in Table 1 with a relevant explanation.The study employed the logarithmic format of variables to obtain small coefficients and interpret estimates smoothly with relevance to CO 2 emissions, as determined by [9,[49][50][51][52][53][54][55][56].

Econometric Methodology
The links between CO 2 emissions, ECON, FD, GDPPC, FD, URB, GFCF, and TRADE are shown by a simple equation taking "i" as the explicit BRI full panel candidate country and "t" as time for 47 BRI economies.In the illustration, it is essential to detect the unit root for subjected variables when they are either stationary, in the first difference or in the second difference.Usually, there are many unit root tests for the individual time series dataset (ADF, PP, KPSS, and GLS, among others).The tests in [57][58][59] are recognized to have low efficacy compared to the alternative state of stationary series, used predominantly for small illustrations.The panel data provides a greater number of points in the dataset, increasing the degrees of freedom (dof) and decreasing the multicollinearity among the predictor regressors.As such, it tolerates further authoritative statistical tests and the values under test statistics asymptotically track a normal dispersion, as a replacement for nonconventional dispersion.There are various tests available for the panel unit root, such as in references [60][61][62][63].In this study, four different unit root tests were used, including Levin, Lin and Chu (LLC) [62], I'm, Pearson and Shin (IPS) [63], Augmented Dickey Fuller (ADF) Fisher Chi-square, and panel Phillips and Perron (PP) unit root tests.Furthermore, if the panel datasets assert the same level of integration under the unit root estimators with significance spot, then panel cointegration would be pulsed via various cointegration tests in BRI grouped economies.Moreover, this further allows for cointegration inspection among the predicted variables and regressors under the Pedroni cointegration test [64][65][66].The cross-checking was done with a Johansen Fisher panel cointegration test pioneered by the authors in [67], later upgraded in reference [60], here applied to evaluate the long-run cointegration among the subjected variables.The Kao-based residual cointegration test was also employed to authenticate the estimations, which were derived from the Pedroni and Johansen Fisher panel cointegration analyses correspondingly.Subsequently, dynamic panel modeling, including fully modified ordinary least square (FMOLS) and dynamic OLS (DOLS) models operate explicitly to identify the links from the regressors to the dependent variable.However, the robustness of the FMOLS and DOLS models were metered by exerting panel pooled regression, fixed effect, and random effect models harmoniously.To sum up, various problem-solving tests such as the Jarque-Bera test and normality tests declared the estimations' robustness.

Model Identification
The predicted variables and regressors in the investigation are rendered in Equation ( 1), which has been tracked by different investigators, see [9,40,[49][50][51][52][54][55][56].The equation is expressed as below: The reformation of Equation ( 1) has been carried out to grasp all subjected variables and transform them into natural logarithms.Hence, the problem of heteroscedasticity and high coefficient estimators could be resolved.Equation ( 2) is specified as below: The representation in Equation ( 2) magnified the predicted variables and regressors; "ln" suggests a natural logarithm; and "i" and "t" pronounced the country-explicit statistics and time in the dataset correspondingly.Moreover, "α" is an intercept; entire β illustrates the relevant country-explicit parameters in the subjected regressors; and "ε i,t " is the innovativeness or error term in this investigation.

Panel Unit Root Tests
An early inspection of the dataset outlined by four-panel unit root tests (LLC, IPS, ADF, and PP) identifies the stationary level of the presented variables.The engrossed longitudinal dataset suggests that a larger number of time occurrences may foster a degree of freedom and cause the delinquents of the multicollinearity in the least square equation to trickle.The unit root tests of IPS and LLC are grounded on following model equation: Equation ( 3) incorporates y i,t the longitudinal dataset for "i" economy and "t" time period, "pi" stipulates the lag operator in the regression equation."ε i,t " particularizes the innovativeness or error terms for every individual BRI economy and time span, for the normal random distribution of the predicted variables and regressors.Null and alternative hypothesis were established to trail the stationarity properties of variables under the four different panel unit root tests (LLC, IPS, ADF and PP); likewise, H 0 = Null hypothesis p = 0 for the full panel comprises economies "i" (contains series with a unit root); on the contrary H 1 = Alternative hypothesis p < 0 with a minimum of one or a few "i" (does not contain dataset series with a unit root).Similarly, the hypothesis will be accepted or rejected by relating with asymptotically predetermined table values.Moreover, the LLC test for the unit root is grounded in Equation (3), nonetheless it considers autoregressive and moving average (ARMA) terms and their coefficients coherently in diagonal to the subjected variables.

Panel Cointegration Tests
According to the inference, under the panel unit root examination the dataset series could either be steady at level I (0) or at first difference I (1).Likewise, if the dataset series are stationary at that level, that would prompt the application of conventional OLS panel procedures, but if the series are stationary at first difference, we should explore the cointegrating association between the predicted variables and regressors.The order of cointegration (1, 1) acquired as two variables, may be incoherently non-stable, but its unveiled, linear-patterned stationarity is positioned between them, indicating that panel cointegration exists among the variables.The panel cointegration tests devised by [64,65] have been utilized to gauge the stationarity position between the variables as employed by [56,[68][69][70].Hence, the variables consistently integrated at the first-order I (1) will sequentially determine whether the data series has cointegration.The test for panel cointegration contains seven residual-based statistical tests to elect the presence of long-run links among the data series.These residual-based regression statistics comprise panel rho-statistic, panel v-statistic, panel ADF-statistic, panel PP-statistic, group rho-statistic, group PP-statistic, and group ADF-statistics.The hypothesis of the Pedroni cointegration test and null hypothesis is constructed as H0: there is no cointegration association for all "i"; in contrast, the alternative hypothesis is determined as H1: there is a cointegration relationship for all "i".In the event that the panel statistics have a larger positive value as their weight, while in contrast the statistics have a larger negative value as their weight, the "H0" hypothesis denotes that there is no cointegration among the two dataset series, and it is discarded, it is inferred in conclusion that there is a long-run connection between the subjected predicted variables and regressors.
The Pedroni cointegration test equation is as follows: In Equation ( 4), the footing description of the cointegration test has been exhibited, where "α i " is the country-specific constant, and the deterministic tendency is δ i t for corresponding single countries in the full panel of 47 BRI economies.The standardized evidence is distributed asymptotically as values extracted in the Pedroni cointegration test.As a result, the Pedroni equation format could be as follows: Equation ( 5) discloses µ, and V uncovered Monte Carlo (MC)-shaped and variation terms, respectively.The opening four statistics embody panel statistics or within-dimension valuation, while the far ahead three symbolizes (cluster) statistics tests or between dimensions.
We also operate the Johansen Fisher panel cointegration test to authorize outcomes from the Pedroni cointegration test founded on the individual intensive Johansen cointegration test devised by [67].The test estimations found that there exists long-run cointegration among the data variables.Furthermore, the Pedroni and Johansen Fisher cointegration tests were counterchecked by employing the Kao residual-based cointegration test.

Dynamic Panel Modeling
The study engaged the [65,66,71] panel fully modified OLS (FMOLS) and dynamic OLS (DOLS) to measure the long-run cointegrating relationship between regressors and the predicted variable (CO 2 ).The principal motivation for exploiting the dynamic economic models FMOLS and DOLS takes into consideration the correlational setbacks among the panel intensive-error terms.
Indeed, all studied variables are transformed into logarithms, to standardize the results.The following equations will determine and measure the FMOLS and DOLS estimations over the study hypothesis: where The Ωi term displays the matrix of long-run stationarities following by Ω0 21i , which deal with the covariance amid stationary error terms.Moreover, the Γi illustrates the corrected covariance term among the regressor variables.

Heterogeneous Panel Causality Test
The subsequent phase in determining the links between the variables outline the track of causative association by Granger causality examination.Here, the heterogeneous Granger causality test described by [72] and centered on Wald asymptotical values will be exploited to extract the estimators.The benefit of this assessment is that it considers the reliance on individual economies and heterogeneity.Furthermore, it can function when the time length (T) is greater or lesser than the cross-country length (N).In this technique, the examination functions with two regular dataset series, and if the dataset series handled in the examination are not steady, they should be steadied by taking their divergence (first difference).During the pairwise heterogeneous Granger causality inspection, "H0" is the null hypothesis and "H1" is an alternative hypothesis.

Empirical Results and Discussion
The empirical valuations were obtained by using the FMOLS and DOLS modeling.A total of 47 BRI economies were considered, concerning the total energy, economy and ecological sustainability challenges and prospects across the full panel and in the cross-country examinations, illuminating the long-run estimators for country-specific policy decisions and implications.

Descriptive Statistics
Table 2 displays the summary information for all the studied variables dynamically.It covers 47 cross-sections and 37-time spans that encompass, in total, 1719 observations.The variables were principally transformed into natural logarithms to sidestep undesirable shocks; similarly, these estimations might also have unveiled setbacks to the reliability of the current study.The mean, median, maximum and minimum values are displayed in Table 2.These signify the ranges and dispersion of the dataset.The standard deviation elaborates that how much a specific time series data point diverges from its mean value.The skewness and kurtosis of the dataset were observed, where the skewness reveals the degree of asymmetry in the dataset information and kurtosis whether the dataset series distribution has peaks or is flat.There are three points of skewness; normal = 0, positive = long right tail (higher statistics values), and negative = long left tails (lower statistics values).In the same way, kurtosis also has three positions, namely, Mesokurtic = normal distribution (value of kurtosis is 3), Leptokurtic = peaked curve (positive kurtosis leads that are higher than 3) and Platykurtic = flatted curve (negative kurtosis leads that are lower than 3).The Jarque-Bera test (JB test) assesses the normality of the data series in the subjected study analysis.

Correlational Statistics
Table 3 shows the correlational statistical values of the subjected variables and their respective probability.It seems that all variables are significantly correlated with CO 2 emissions in 47 BRI economies.Indeed, urbanization and energy consumption have more than 50% influence on environmental quality, whereas the GDPPC, trade openness, financial development and gross fixed capital formation were 42.32%, 36.52%,25.92 and 20.96%, respectively.This implies that energy consumption and urbanization damage the environment much more adversely than other regressors.

Panel Unit Root Tests
The panel unit root tests (LLC, IPS, ADF, and PP) were used to analyze the stationarity position of the studies dataset.The retrieved estimations are reported in Table 4.All variables under the LLC, IPS, PP and ADF tests were stable and stationary at first difference.This indicates that all variables are stationary at first difference, which prompts exploration of the cointegration state among predicted variables and regressors.However, under the ADF and PP unit root tests, urbanization had significant probability and trade also had significant probability at 10%.On the other hand, as the variables were converted into the first difference, these all become stable.Under all unit root tests, the null hypothesis was discarded (H0 = there is a unit root) and the alternative hypothesis accepted (H1 = there is no unit root) to support the first-order stationarity inferences.At first the descriptive statistics and panel unit root estimations were probed to assess the probable cointegration position.Then, there was a move for the engagement of different cointegration tests, such as Pedroni panel cointegration tests, the Fisher and Johansen and Fisher cointegration test and the Kao-based residuals test, as reported in [56,70,73].Pedroni cointegration permits greater T and N to scrutinize the cointegrated links among the disclosed variables.The model computed seven tests based on individual and cluster groups, where the probability significance determined the level of cointegration among the variables.In Table 5, seven tests overruled the null hypothesis (H0), and ensured that at I (1, 1) the variables have long-run cointegration.In addition, the Johansen and Fisher (JF) panel cointegration test was employed and reported in Table 6, to authenticate and align the Pedroni-based panel cointegration outcomes.The results of the JF cointegration test are shown in Table 6, suggesting the discarding of the null hypothesis (H0) under that particular test, meaning that there is no cointegration among the variables.Equally, these two tests affirm and ensure that there is long-run linear combination between the variables, as a clue for long-term panel cointegration.Finally, the Kao-based residual cointegration test was used as an additional certification to obtain strong and solid results for long-run cointegration, which are presented in Table 7.We found a result of −5.952 *** when using Kao-based statistics (−5.952 ***), which suggests that the previous two cointegration tests were efficient and warrant additional authentication.

Dynamic Panel Modeling
The panel estimations of the cointegration tests validated the long-run cointegration among the variables.It likewise suggests the application of fully modified OLS (FMOLS) and dynamic OLS (DOLS) for stable results [65,66,71].DOLS and FMOLS were operated to test the study hypothesis and acknowledge the desired links.The empirical estimation in Table 8 reveals that the energy consumption, financial development, gross fixed capital formation, urbanization, and gross domestic product positively and significantly affect the ecological situation (increase in CO 2 emissions).On the other hand, trade openness has no adverse effect on ecological status in the 47 BRI economies.Using FMOLS, we found that a 1% rise in energy utilization, economic growth, financial development, gross fixed capital formation and urbanization leads to changes in ecological degrading (CO 2 emissions), with (0.16259 ***), (0.040417 ***), (0.012342 ***), (0.005335 ***) and (0.030532 ***), respectively.Likewise, trade openness has a negative impact on ecological status.The FMOLS estimations suggest that 47 BRI economies may have set up some policies that are controlling mutual trade openness and its adverse effect on ecological sustainability, but in contrast, others indicate alarmingly mounting pressures on ecological degradation for the 47 BRI economies.For the success of the BRI, censured actions must be taken, and governments need to adopt robust policies to reduce ecological degradation.Furthermore, the DOLS model produced the same estimates as reported for FMOLS, where energy utilization, economic growth, gross fixed capital formation, financial development, and urbanization patterns vary in terms of their effect on ecological degradation (CO 2 emissions).Similarly, trade openness has a negative influence on ecological status.Overall, the summary of the results of DOLS, and FMOLS suggests that in the 47 BRI countries, energy consumption highly based on oil, coal, and gas (non-renewable energy sources) is a threat to the ecological sustainability of BRI projects in the future.Does every nation need a high economic growth rate, no matter how it is achieved?The attainment of a high GDP in developing, emerging and low-developing economies has recently unfavorably affected environmental sustainability.Most economies under BRI are dependent on investment but not on green-intensive investment.Popular awareness of green investment may urge the scale of economic growth without deteriorating the environment.In the meantime, urbanization should be controlled in a way that will not influence ecological sustainability or its position.This study draws similar inferences to [8,9,25,40,[49][50][51][52]55,56,70,74].

Dumitrescu Hurlin Panel Heterogeneous Causality Test
A panel Granger causality test based on heterogeneity, pioneered by [72], identified the causative links among the variables in the panel of 47 BRI economies.The results of the panel Granger causality test are shown in Table 9.The heterogenous causality test estimations for the 47 economies offer divergent results.The causative estimates suggest bi-directional links from energy consumption, economic growth, financial development, urbanization and gross fixed capital formation towards CO 2 emissions (environmental quality), except for trade openness, which has unidirectional ties with environmental quality.Moreover, the heterogeneous panel test determined that an increase in regressors significantly causes a worsening of the environment quality.The nature of such estimations reveals that most of the economies in the BRI are emerging and less-developed countries are currently trying to increase their economic growth, mutual trade cooperation, infrastructural development and much more, but have not yet approached how encourage growth without having a negative effect on the environment.As such, BRI economies should introduce strong policies for solid governance as a whole, planning for mitigating the demand and supply of energy, BRI projects' energy and ecological challenges and prospects, growing industrial production for mutual trade, policies for renewable energy dependency, forming industrial waste and water treatment plants and many others.

Country-Wise Long-Run Estimations
In the cross-country long-run estimations, dissimilar results were found, where the CO 2 emissions were intensely increased by economic growth in all countries and energy consumption in 30 countries, and other predictors testified some mixed interactions of economic indicators with CO 2 emissions at the country level.The long-run statistical evaluations of ecological degradation centered on an individual economy are presented in Table 7.The outcomes of all economies, from Albania to Yemen, in Table 10, confirms the positive influence of economic growth on ecological deterioration [40,56].Likewise, energy consumption has a mixed positive and negative effect on ecological quality due to the participation of few developed economies in the BRI panel.Since the acute dependency of such economies may depend on renewable energy sources, their ecological challenges are diminishing or even suggest no ecological degradation.However, most BRI economies are emerging, developing, and less-developed nations, which need more time and resources to make acute investments in protecting their environment and self-sufficiently producing renewable energy sources (hydro-power, wind power, biomass energy, solar power, waste-based energy, etc.).Trade cooperation among the BRI economies could extend ecological sustainability via the exporting of green-economy-based appliances and green investments.In a context of cross-country urbanization, governments should seek to implement opportunities that would reduce the environment degradation.

Robustness Examination of the Dynamic Panel Models
The robustness of the DOLS and FMOLS estimations was counter-checked by employing pooled regression, fixed effect and random effect models, as displayed in Appendix A, Table A1.These three techniques were used to tackle the conventional endogeneity and heterogeneity problems.All variables under the DOLS and FMOLS techniques were positive and significantly influenced the quality of the environment adversely, with the exception of trade openness.However, a cross-check was proposed using pooled regression, random effect and fixed effect models, to furnish unbiased outcomes from endogeneity and serial correlation.Similarly, the linear OLS model revealed mixed results but with a fixed effect, and the random effect models delivered robust results using the abovementioned DOLS and FMOLS techniques.The observed R-square was sufficient to harmonize the model fitness.Moreover, the "Hausman test" confirms that the fixed effect model is best suited to the present study.Hence, the study estimates determine that energy consumption, gross fixed capital formation, financial development, and economic growth positively and significantly affect CO 2 emissions, but on the other hand, trade openness negatively influenced ecological sustainability for the full panel.

Conclusions, Recommendations and Future Implications
The main purpose of the present study was to discover the relationship between economic growth, trade openness, financial development, energy consumption, urbanization and environmental degradation in the 47 BRI economies from 1980 to 2016.First, various four-unit root tests (LLC, IPS, ADF and PP) were implemented to gauge the stationarity of the dataset, and then three cointegration tests were engaged to sketch the cointegration links between the subjected variables.The cointegration valuations recommended the use of the DOLS and FMOLS tests in the full panel of 47 BRI economies; similarly, robustness was measured using pooled regression, random effect and fixed effect.Furthermore, a pairwise Granger causality test ensured the stability of the results in the causative mode, where bi-directional links were observed for energy consumption, economic growth, financial development, urbanization and gross fixed capital formation towards CO 2 emissions (ecological quality), except for trade openness, which had unidirectional ties with environmental quality.Moreover, the cross-country scrutiny portrayed multidimensional estimators, suggesting corresponding diversified policy implications at the regional and countywide levels.
In the above discussion, the dynamic panel modeling (DOLS and FMOLS, fixed effects and random effects), and panel causative heterogenous test showed that all the regressors positively and significantly impacted environmental quality, except for trade openness, which had a negative impact on CO 2 emissions.Therefore, it was inferred that solid governance, and individual country-specific policy decisions should be proposed, so that they can benefit through BRI success.Likewise, the cross-country, long-run analysis concluded that economic growth in all 47 economies increasing environmental degradation in all countries, whereas the evidence for energy consumption was mixed.The negative coefficient was due to the small number of developed economies encompassed in the 47 BRI full panel; developed economies are more heavily dependent on renewable energy sources and consequently their ecological challenges are diminishing or there is even no ecological degradation.However, most BRI economies are in developing, emerging and less-developed nations, which need more time and resources to make acute investments in protecting their environment and self-sufficiently producing renewable energy sources (hydro-power, wind power, biomass power, solar power, waste-based renewable energy, etc.).Hence, the Chinese government, in collaboration with other BRI economies, should be diverting the pattern of investments from coal-based plants to renewable energy sources (wind, hydropower plants, solar energy plants and biomass-based energy, etc.).The trade cooperation among the BRI economies could spread ecological sustainability by trading green-energy-based appliances and technologies.Governance of cross-country urbanization should be carried out by implementing opportunities that will also reduce the environmental degradation.Furthermore, the study provides harmonious policy implications for the full panel and specific countries.
The nature of the estimations reveals that most of the economies in the BRI are emerging, developing and less-developed countries who are currently trying to improve their economic growth, mutual trade cooperation, infrastructure development and much more, but have not yet approached the idea of achieving this growth without leaving a deteriorative impression on the environment.Hence, BRI economies should make strong policies for solid governance as a whole, planning to mitigate demand and supply of energy, address ecological challenges and prospects, and prepare industrial production for mutual trade.Moreover, polices for renewable energy dependency, industrial waste and water treatment plants and many others could be an additional weapon for the accomplishment of the BRI dream and may provide enough energy resources to ensure the smooth operation of the BRI projects.Therefore, the Chinese government has initiated the "Vision and Action of Energy Cooperation for Jointly Building the Silk Road Economic Belt and 21st-Century Maritime Silk Road" [75] to acutely address the demand for energy of the BRI projects.The initiation of more action plans to cater for the forthcoming energy and ecological challenges at the country level or overall across the BRI panel should also be demanded.Wide-ranging estimates from recent studies may aid economies and groups of economies to measure natural hazards, GHG emissions, and to develop energy conserving opportunities and fulfill energy demand, to smooth project operations, to fruitfully accomplish the overall BRI projects.
Overall, the BRI project requires a stable economy, sufficient energy sources, and prudent environment management, presenting big concerns for BRI contender economies.For the authorities and policymakers of BRI countries, the current study suggests directions for them to execute proposed measures for ecological sustainability, i.e., the demand mitigation of energy should be reliant on renewable sources, economic sustainability should be focused more acutely on eco-friendly investments, and the general public should be made familiar with green investment plans.Moreover, green coal energy sources have a very large potential to play a role in energy and ecological developments in BRI economies.Also, households should be motivated to buy energy-efficient products and green technologies for daily use, such as electric means of transportation, energy-efficient lighting, etc.It is crucial to construct water-, waste-and carbon-treatment plants near industrial areas.The study results further allowed us to make policy suggestions for environmental academics and specialists, who need to assign financial resources based on the studied factors to ensure the greatest yield.The exaggerated growing trend of GHGs suggests that economies should be forced to make an effort to commit to promoting economic and ecological sustainability.
This novel study had a small number of limitations.For instance, new BRI projects challenge related investigations, which do not mirror the EKC when examining the sum of predicted variables and regressors.In future, investigators may also extend their cross-section sample size and time span.Furthermore, researchers may modify the variables to include other variables that could produce more interesting inferences.Moreover, forthcoming research may measure the links of the selected variables with numerous other environmental pointers, for example, natural catastrophes, global warming, sulfur oxide (SO 2 ), carbon monoxide (CO), nitrogen oxide (NO 2 ), industrial pollution and health influences, with the intention of obtaining a comprehensive environmental impression owing to the previously stated functioned variables.

Figure 1 .
Figure 1.Carbon emissions of selected Belt and Road Initiative countries and the world.Source: [19].

Table 1 .
Variable descriptions and data sources.

Table 2 .
Descriptive statistics.CO 2 denotes carbon emissions; ECON depicts the Energy consumption; GDPPC shows Gross domestic product per capita; FD represents Financial development; GFCF indicates Gross Fixed Capital Formation; URB identifies Urban population; and TRADE signifies Trade Openness.Furthermore, JB Test reveals the Jarque-Bera test for normality; Std.Dev.denotes standard deviation; Prob.defines the probability of JB. test and Obs.illustrates the number of observations in the dataset.
Note: Author's tabulation where; CO 2 denotes carbon emissions; ECON depicts the Energy consumption; GDPPC shows Gross domestic product per capita; FD represents Financial development; GFCF indicates Gross Fixed Capital Formation; URB identifies Urban population; and TRADE signifies Trade Openness.*, **, *** indicates that statistics are significant at the 10%, 5% and 1% level of significance, respectively.

Table 4 .
Panel unit root test.CO 2 denotes carbon emissions; ECON depicts the Energy consumption; GDPPC shows Gross domestic product per capita; FD represents Financial development; GFCF indicates Gross Fixed Capital Formation; URB identifies Urban population; and TRADE signifies Trade Openness.Furthermore, LLC indicates Levin, Lin and Chu unit root test; IPS depicts I'm, Pearson and Shin; ADF illustrates ADF Fisher Chi-square and PP displays the Phillips and Perron unit root test.*, **, *** indicates that statistics are significant at the 10%, 5% and 1% level of significance, respectively.

Table 6 .
Johansen fisher panel cointegration test cointegration rank test (trace and maximum eigenvalue).

Table 7 .
Kao test for residual cointegration.

Table 8 .
Panel long-run estimation under fully modified and dynamic OLS (DOLS and FMOLS).CO 2 denotes carbon emissions; ECON depicts the Energy consumption; GDPPC shows Gross domestic product per capita; FD represents Financial development; GFCF indicates Gross Fixed Capital Formation; URB identifies Urban population; and TRADE signifies Trade Openness.*, **, *** indicates that statistics are significant at the 10%, 5% and 1% level of significance, respectively.