Sustainable Initiatives in Sports Organizations—Analysis of a Group of Stakeholders in Pandemic Times

: This study explores the importance of environmentally sustainable initiatives in sport (ESIS) for stakeholders in pandemic times. Three topics—climate changes and energy consumption, environmental impact of sports events, and health and well-being—were considered and analysed under three sustainability forms: organisational, community, and individual. A total of 5917 stakeholders (sponsors, employees, and members) of a sports organization realised one online survey. The data gathering process occurred during pandemic times, when every kind of collective sport event was suspended to the general public. The descriptive analysis of the results is provided, and the ﬁndings reveal that health and well-being is the most valorised topic by members and employees, in a sustainable individual form. On the other hand, sponsors manifest their interest mainly in a sustainability organisational and community forms.


Introduction
Several organizations have tried to measure and monitor proximity, through metrics and sustainability indicators, in the perspective of Sustainable Development, considering it is "progress that meets the needs of the present without compromising the ability of future generations to satisfy their own needs", as defined on the Brundtland Report [1] (p. 24). Within these organizations are sports organizations. Sports industry, in particular professional sports organizations, has an enormous capacity to influence consumer behaviour [2][3][4]. There are various stakeholders that make up the "modus vivendi" of these organizations (e.g., members, employees, sponsors). In a transversal way, economic, social, and environmental sustainability starts to be a dominant theme in society. Outlining sport in a comprehensive way, including all parties involved (players, managers, fans, among others), sport ecology studies the relationship between sport and the natural environment in a reciprocal manner [5].
Professional sports organizations, concerning environmental sustainability, have gradually come to carry out initiatives with the aim of sensitizing their stakeholders, thus expecting direct and indirect gains. However, there is a huge lack of knowledge of these initiatives regarding the results [6], and further analysis and strategies should be followed [7]. Some important questions come up when sustainable initiatives are executed. Which and how many stakeholders are aware of the initiatives carried out? How important is individual health and well-being in the sustainable initiatives? What is the perception of stakeholders regarding the performance of the sports organization in these types of initiatives? Among the various stakeholders, are there differences in the sustainability forms previous investigations [24,25], Wall-Tweedie and Nguyen (2018) claim that "the academic literature pertaining to Environmental Sustainability (ES) and sport has been reported to be in its infancy" [17] (p. 743).
Considering this fact, it seemed particularly important to develop a research work that would allow understanding of what extent sports organizations are considered legitimate to convey environmental messages, related to the promotion of environmental behaviors. This approach was developed from a supply and demand perspective, considering sponsors, employees and members (SEM), and analyzes the impact of environmentally sustainable initiatives in sports (ESIS) on a triple level (organizational, community and individual), based on Lindsey (2008) [26].
Developed on prior literature and the narrow understanding of stakeholder's results concerning environmentally sustainable initiatives in sport (ESIS) promoted by sport organizations, the present study aimed to contribute to the nascent field of sport ecology by analysing, through quantitative methods, the awareness of relevant topics of stakeholders of a professional football club and its positioning as a sustainability form. Accordingly, two quantitative studies with a group of stakeholders support this article concerning ESIS: • Study 1: identifies who is aware of the ESIS, which is the most important topic, and it investigates the categorization regarding the organization's performance concerning ESIS. • Study 2: analyses the differences between the different groups of stakeholders in the topics covered.
This paper follows an organized sequence based firstly in a more detailed literature relating to the three forms of sustainability that emerged from the analysis, in order to define the purpose and the research goals. Research hypotheses are enlightened and a conceptual research model is designed. The methodology section focused on the description of the empirical study, mentioning the data gathering process and data treatment. Results for study 1 and study 2 are then presented and discussed in relation to the literature. Theoretical contribution and managerial implications are highlighted. General conclusions are drawn, research limitations are mentioned, and recommendations are expressed, regarding the extension of knowledge on sports sustainability development.

Theoretical Background
Sport can be an instrument for constructive societal transformation. As a significant symbol of popular culture, professional football, "has the potential to transform how we view and practice sustainability" [27] (p. 396). Sports organizations increasingly engage in environmentally friendly business practices. For McCullough and Cunningham (2010) [28], there are several pressures (functional, political, social) that can positively influence the adoption of environmental sustainability practices by sports organizations. The authors conclude that in addition to immediate advantages (cost reduction, increased competitive advantage, perceptions of goodwill on the part of consumers), such initiatives can increase fan identification, one of the main objectives of the sports industry. Extending past research [7,12,[28][29][30][31][32], it is our goal to acknowledge how stakeholders (i.e., members, employees, and sponsors) feel the perceived effects regarding relevant topics of action for a sport organization in the scope of environmental sustainability.
In research of the concept of sustainability in sports development, Lindsey (2008) [26] found a similarity between different authors and their respective proposals. After identifying a lack of clarity and little theory, it presents an applicable proposal to sustainability in sports development based on concepts of health literature. This is established on a model that identifies four forms of sustainability, hierarchically equal, without levels: individual, community, organisational, and institutional. Following the same line of reasoning [26] the concepts will be adjusted and adapted to a format that allows analysis of the results of different stakeholders in the panorama of environmental sustainability of a sports organization. In this way, taking into account that Lindsey (2008) [26] defines institutional sustainability as requiring more time and a broader context, it will not be used. The forms of individual, community, and organisational environmental sustainability will be used, properly framed with the topics analysed. In the questionnaire carried out, several topics were addressed. For this study, concerning environmental sustainability, the topics considered were: (a) climate changes and energy consumption (CC); (b) environmental impact of sporting events (EI); (c) promotion of health and well-being (HW) (see Figure 1). This paper follows an organized sequence based firstly in a more detailed literature relating to the three forms of sustainability that emerged from the analysis, in order to define the purpose and the research goals. Research hypotheses are enlightened and a conceptual research model is designed. The methodology section focused on the description of the empirical study, mentioning the data gathering process and data treatment. Results for study 1 and study 2 are then presented and discussed in relation to the literature. Theoretical contribution and managerial implications are highlighted. General conclusions are drawn, research limitations are mentioned, and recommendations are expressed, regarding the extension of knowledge on sports sustainability development.

Theoretical Background
Sport can be an instrument for constructive societal transformation. As a significant symbol of popular culture, professional football, "has the potential to transform how we view and practice sustainability" [27] (p. 396). Sports organizations increasingly engage in environmentally friendly business practices. For McCullough and Cunningham (2010) [28], there are several pressures (functional, political, social) that can positively influence the adoption of environmental sustainability practices by sports organizations. The authors conclude that in addition to immediate advantages (cost reduction, increased competitive advantage, perceptions of goodwill on the part of consumers), such initiatives can increase fan identification, one of the main objectives of the sports industry. Extending past research [7,12,[28][29][30][31][32], it is our goal to acknowledge how stakeholders (i.e., members, employees, and sponsors) feel the perceived effects regarding relevant topics of action for a sport organization in the scope of environmental sustainability.
In research of the concept of sustainability in sports development, Lindsey (2008) [26] found a similarity between different authors and their respective proposals. After identifying a lack of clarity and little theory, it presents an applicable proposal to sustainability in sports development based on concepts of health literature. This is established on a model that identifies four forms of sustainability, hierarchically equal, without levels: individual, community, organisational, and institutional. Following the same line of reasoning [26] the concepts will be adjusted and adapted to a format that allows analysis of the results of different stakeholders in the panorama of environmental sustainability of a sports organization. In this way, taking into account that Lindsey (2008) [26] defines institutional sustainability as requiring more time and a broader context, it will not be used. The forms of individual, community, and organisational environmental sustainability will be used, properly framed with the topics analysed. In the questionnaire carried out, several topics were addressed. For this study, concerning environmental sustainability, the topics considered were: (a) climate changes and energy consumption (CC); (b) environmental impact of sporting events (EI); (c) promotion of health and well-being (HW) (see Figure 1).

Climate Change and Energy Consumption
Knowing that the links between the sports economy and the environment have already been studied [33], in football, like other sports (e.g., basketball or American football), factors such as team quality, market potential and exhibition quality are key in capturing audiences, as well as in later understanding of consumer behaviour [34]. Consumers are increasingly demanding about the service provided by sports organizations. The construction of large sports stadiums is part of the development process of the sports industry, but has an associated environmental cost [14]. Curiously, one of the goals of building these infrastructures is to reduce CO 2 emissions, which is paradoxical [29].
With regard to the environmental conditions in which professional competitions take place, a study about spectators of the Chinese Super League (CSL) leaves no doubt; consumer habits are not affected by the presence of air pollution [35]. At the time of the study, the body that oversees CSL did not encourage the creation of environmental rules with the aim of promoting consumer health or CSL's global policy. However, in the authors' conclusions, for the better functioning of the CSL and to attract new audiences, it is crucial to establish environmentally friendly measures. Whether on a more specific and short-term plan, or more global and long-term, climate change requires modifications that are felt in the most diverse scenarios. For example, when traveling to stadiums, fans use public transport as their main means of transport or, as an alternative, share their car with other fans. In the facilities where the events take place, having different containers for garbage is another situation that is increasingly recurrent in sports organizations concerned with the environment. This requires a waste treatment and transport system that goes beyond the mere receptacle to receive garbage. The organizing entities or their partners (i.e., sponsors) plan awareness-raising actions that reward (e.g., with event tickets) environmentally friendly behavior or reward members with discounts on the purchase of material or associated services. These are just a few ideas that leverage greater stakeholder awareness of environmental issues.
Although it is a little noticed reality, there are already sports that are obliged to anticipate the way in which their practice has to be carried out (e.g., cross-country skiing) [36]. At the global level, and with long-term strategic thinking, the number of cities available to host major multisport events (e.g., Olympic Games) tends to decrease. In order to reverse this reality, we need a multidisciplinary collaboration with special emphasis on facilities management, communication, sports marketing, and sports psychology [32].
Although slowly, environmental sustainability (ES) has been gaining ground and credibility, requiring greater investment and visibility toward the initiatives carried out [37]. The fact that professional sports organizations are paying more and more attention to climate change and the energy consumption of their facilities has nothing to do with charity. Such results can be gauged on a more concrete (i.e., fan) or a more abstract level (i.e., credibility in society). Remarkable work [2,15,30] revealed that a sports organization can have a huge influence, through sustainability campaigns, in influencing the behavior of sports fans, both in the events themselves and in their daily lives. In addition, these works determined that fans least identified with the team strengthen their ties with the team due to the organization's commitment to environmental sustainability. On the other hand, Babiak and Trendafilova (2011) [28], through the use of institutional theory, concluded that the sustainability practices used by sports organizations allow a double advantage; first, credibility with stakeholders; second, protecting the organization from possible criticism. In this way, the authors add, towards the general public, the positive effect of the way of doing business on the part of the organization increases. Since there are already standard procedures, as well as environmental protection policies, much remains to be done in terms of monitoring and reporting [23,38].

Environmental Impact of Sporting Events
With regard to major sporting events held on a seasonal basis (e.g., every four years), such as the Federation International Football Association (FIFA), the World Cup, or the Olympic Games, studies show that around three million spectators travel an average of 4000 km to be able to be present at these major events [39]. It is an indisputable fact that in recent years there has been an exponentially increasing number of spectators who travel to see a sports show [40], whether this is frequent or seasonal. This trend is also seen in the increase in the number of spectators who follow their favorite teams, in addition to home games [38].
Considering sport ecology research, Thibault (2009) [41] has developed several studies to understand not only the production of different forms of pollution, but also the environmental effect that sporting events produce. One of the characteristics of sports is related to its enormous variety and organizational and performance complexity, which can be studied from the point of view of the spectator itself or of the practitioner. The environmental impact related to the attitude of the spectators has been the subject of several studies, in the field of football, rugby, or the Tour de France [42]. In baseball, a mass sport in the United States, a research was made concerning the influence that the spectator has on the local air pollution, and was considered irrelevant [43]. At the university level, the effects of transportation that football spectators produce on air quality were also studied [44]. As for the study of the carbon footprint of sport participants, there is the paradox that individuals with a greater environmental awareness (i.e., participants in sports in nature) are not the ones who most protect the environment due to the essence of their own activity [45].
Strategies to reduce environmental impact have also been the focus of attention by researchers. The holding of major sporting events has associated costs with regard to the environment. Regardless of the pressure exerted by environmental activists [46], the results of environmental sustainability initiatives often fall short of expectations. In a top-down logic, the promise of a positive inheritance in what concerns the environment is faced with several difficulties in its execution (e.g., due to the complexity of the project itself, or the measurability of the environmental impact itself) [47]. In a bottom-up approach, although there are examples of organizations that show proactivity in the construction of environmentally friendly stadiums [48], there are several factors that contribute to a slow diffusion in the adoption of a sustainable design of new installations by the decision makers, such as narrow financing or inadequate manpower [49]. In addition to the aforementioned, the very implementation of pro-environmental initiatives is struggling with the difficulty of collecting information and subsequent appropriate planning [50]. As far as fans are concerned, from a perspective of attracting new fans [51] or permanence of current fans [15] in terms of environmental sustainability, a lot has been done by the academy in order to understand what are the best methods to seduce fans [52].

Promotion of Health and Well-Being
Sport can be seen as an instrument that generates dynamics that integrate wills, enhance changes, and create great impacts on the cultural, social, and environmental environment. In this way, sport, represented by the respective organizations and companies, public or private, can be considered an important agent in terms of sustainability, acting according to the principles inherent to the concept, and promoting a set of initiatives in this area, including the health and well-being dimension [53]. Throughout human history, the pursuit of health has been among the primary aims of individuals, communities, national governments, and international initiatives [54].
The social and political context of the 1980s, such as the rise of economic globalization, influenced health policy directions as much as other aspects of modern life [55], underlining the importance of health for the contemporary societies. "The Ottawa Charter" of 1986 marked the innovative approach of public health from traditional epidemiological and surveillance methods towards a more environmental and social model [56]. This new ecological approach emphasizes the interconnections between humans and their physical and social environments and their health.
The concepts of health and well-being converge and diverge, both theoretically and in practice [57]. Throughout time, there have been changing philosophies and attitudes to health [55]. The concept of health has been enlarged by WHO (1948) [58], stating that "health is a state of complete physical, social and mental well-being, and not merely the absence of disease or infirmity" (p. 1). This enlarged definition of the concept expresses the contemporary perspective of health, defined in the mid-twentieth century, when the human population struggled less with communicable diseases and more with lifestylerelated conditions.
In the last decades, the search for health has been increasingly considered as a synonym for well-being, happiness, and long life [59]. Currently, health is part of a social framework where there is a growing awareness of the body and mind. The so-called "diseases of civilization" abound, which lead many people to seek new ways of being and feeling, both on a physical and psychological level, privileging the paradigm of health and well-being recommended by WHO (World Health Organization), where sports occupy an important role [58]. The connection between health, well-being and sports has been recently reported by the literature in the field of health, although it remains necessary to systematize the approach between the two concepts [60,61].
The importance of health in sports organizations is fully in harmony with the sustainable development agenda, clearly expressed in the Sustainable Development Goals (SDG) stated by "Goal 3: Ensure healthy lives and promote well-being for all at all ages" [62] (p. 18). Considering this statement, sport organizations should consider enlarging their strategic and operational goals, focused on their potential to contribute to the well-being of individuals and communities [63]; ESIS fit in this scenario.
However, the emergence of COVID-19 came to reinforce this statement. The pandemic provoked a health crisis and a global financial decline, due also to the lockdown policies that restricted the individual and collective mobility, forcing important changes to lifestyle [64]. These general restrictions imposed by the COVID-19 pandemic provoked significant social changes and affected several sectors at the global scale, including the sport industry by having an impact and altering the normal development of sport competitions and events [65]. Due to social distance being one of the most important rules to control the virus proliferation, leisure activities, namely the participation on sports manifestations, were suspended, significantly influencing the psychological state of individuals [66] at an individual and social level.
Considering sport contributes to well-being, that fact also affected the psychological health of sports organizations stakeholders [67]. The new situation also represented a challenge in terms of managing the multiplicity of companies linked to the sports sector, forcing them to define new business models compatible with the changes imposed, namely in terms of entrepreneurship [68]. This climate of change may also represent the emergence of new opportunities, where the health and sustainability factors will be inseparable in the future.

Questioning and Confirming Hypotheses
With regard to sustainability, a lacuna remains among the sport industry efforts and academic work [7,26]. As for the way sports organizations evaluate the sustainability campaigns they carry out, these are non-existent or incipient [6]. Taking into account the reality, it is very clear that there is a need for more academic work in order to be able to more accurately transmit the efforts made by the sports industry with regard to environmental sustainability [7]. Following the work of McCullough, Pelcher and Trendafilova (2020) [32], we want to assess the extent to which sports organizations are perceived as legitimate to convey environmental messages related to the promotion of environmental behaviors. Finally, this work also aims to continue to explore and evaluate the effectiveness of marketing in the area of environmental sustainability [7]. Academic research can contribute to the broadening of knowledge in this area from both a supply and demand perspective, monitoring initiatives carried out by different types of sports organizations. In addition to the analysis of their impact at different levels, other studies should assess the degree of involvement and satisfaction of participants through sustainable initiatives, as well as analyze their contribution to the definition of management strategies. It will be also possible to evaluate the evolution of these initiatives in the medium and long term by longitudinal studies.
Thus, for study 1, the following questions are considered: Assuming that sports organizations are credible in communicating the promotion of environmentally sustainable behaviors to the various stakeholders (e.g., members, employees, and sponsors): (1) what is the percentage of awareness of those initiatives? (2) globally, how important is the health topic? (3) through ESIS, how is the sports organization ranked by the stakeholders?
We adapted the Lindsey (2008) [26] model not only to try to understand better sustainability in sports, but also to assess "the degree to which particular forms of sustainability are achieved" (p. 292). Even knowing that the effort of environmental sustainability, on the part of the sport industry, is a reality, it becomes necessary to thoroughly assess the reactions of interested parties (e.g., members, employees, and sponsors) to the efforts made in favor of environmental sustainability [32]. In management, partnerships are not as worked on as strategy and decision making; however, sponsors are vitally important to the survival and competitiveness of sports organizations. For Trendafilova and McCullough (2018) [7], in terms of international partnerships and collaborations, more needs to be done. We seek to extend past work [30] by trying to understand the extent to which sport is seen by sponsors as a platform that enhances sustainability efforts, thereby leveraging the brand. Additionally, in the wake of the work of Trendafilova and Babiak (2013) [12], knowing the opinions of sports sponsors about the meaning they give to environmental initiatives in the sports entities with which they work is paramount, benefiting both entities (i.e., the sponsors and partner organizations). Consequently, for study 2, the following question is formulated: As for the topics analysed, what is the position of each stakeholder as a form of sustainability?
This work also aims to continue to explore and evaluate the effect that ESIS have on the behavior of the various stakeholders, extending past research [3,4,7].

Study 1
Study 1 is composed of three main research hypotheses, multiplied according to the different groups of stakeholders: sponsors (Ha), employees (Hb) and members (Hc). The first hypothesis (H1) is supported by the empirical data and it captures the level of awareness of the different groups of sports organization stakeholders on environmental initiatives. In the sense that sporting events are increasingly spectacles characterized by the need to capture audiences, Climate change and energy consumption arises as a paradoxical topic; to satisfy an increasingly demanding consumer, organizations need to spend more energy, with repercussions on the environment around us [14,29,33,34]. About the topic Environmental impact of sporting events, the execution and reporting of sustainability actions becomes difficult due to the enormous complexity involved [47][48][49]. Lastly, regarding Promotion of Health and Well-being, it is understood from a holistic perspective as a quality of life, properly framed in the pandemic situation we are experiencing [59,[63][64][65][66][67].
Due to lack of measures [6] or the lack of publicity about them [5], it is our intention to know and disseminate the level of knowledge that the various stakeholders have about ESIS. Thus, Hypothesis 1 includes: According to the perspective of Lindsey (2008) [26], individual sustainability is focused on the "maintenance of health outcome for the individual beneficiaries of sustainability initiatives of any programme" (p. 281) and it corresponds in this study to the individual form and to the health and well-being topic. These outcomes may vary according to different sports development programmes. In this study, we intend to measure its importance to the different groups of stakeholders. For that, hypothesis 2 was stated, according to the different groups of SO stakeholders: Bearing in mind the sustainability forms described in literature [26] and the credibility of sports organizations considering the power to influence the behaviour of sport stakeholders [2,15,30], the third hypothesis was designed, stating the performance of ESIS is considered positive by the different groups of stakeholders. So, in Hypothesis 3 we want to know: It is essential to thoroughly measure the feedback of interested parties (e.g., members, employees, and sponsors) concerning ESIS initiatives [32]. As stakeholders, sponsors see sports organizations as a platform that influences environmental sustainability efforts, thus leveraging the brand [30]. Establishing relationships is a major factor concerning the execution of environmental sustainability initiatives [29] and ESIS can increase fan identification [31]. Following the aforementioned line of reasoning [26], the individual sustainability (longer-term changes in individuals' attitudes, aptitudes and/or behaviour through awareness and/or involvement with the ESIS), the community sustainability (maintenance of changes in the community in which the ESIS is delivered), and the organisational sustainability (the maintenance or expansion of ESIS by the organization responsible for their delivery) will be considered. Thus, the following hypotheses are elaborated: The basis for the design of the conceptual research model depicted in Figure 2 considered the large dimension of the sample (n = 5917).

Materials and Methods
This study was conducted with members, employees, and sponsors of Futebol Clube do Porto (FCP), a team competing in the Portuguese top football league (Liga Portugal), acknowledged as the 6th strongest football league worldwide [69]. FCP is among the teams with the largest base of followers [70]. The quantitative research was based on an empirical study consisting of the dissemination by e-mail of an online survey among the FCP stakeholders. The survey was available online during five consecutive weekdays in June of 2020, and a total of 5917 responses were collected. To analyse the collected data, a descriptive statistical analysis using SPSS 25.0 was developed. The analysis procedure in this study conducted a frequency analysis to identify the representativeness of each group of respondents in the total amount of the sample, according to the research goals. Regarding the excluding variable, only 2090 of the responses were considered for hypothesis testing.

Results and Discussion
The findings from the empirical data are discussed in relation to literature from the two studies developed, focusing on the identification of the stakeholders who are aware of ESIS, regarding their classification on the most important topic of ESIS and their categorization on the organization's ESIS performance (Study 1), and determining the differences among the groups of stakeholders in the topics covered (Study 2).

Study 1
The objective of study 1 is triple:  what is the percentage of those who are aware of the environmental sustainability initiatives carried out (global and by group);  of the topics considered most relevant in terms of FC Porto's action, what is the ranking in terms of their importance;  by group, what is the global classification regarding the performance of the sports organization in the area of environmental sustainability.
Study 1 contains a question with an exclusion character, and two questions whose answers give rise to a classification by topic and by group. With the question "Are you aware of the initiatives developed by FC Porto in the area of environmental sustainability?", we can exclude those who are not familiar with the environmental sustainability initiatives. Regarding the total sample, it was possible to verify that the vast majority of the respondents (64.7%, n = 3827) were not aware of the environmental sustainability initiatives (ESIS) promoted by the organization. Considering the ones who admit knowing about the existence of these initiatives, in a group analysis (35.3%, n = 2090), about half (52.9%) of the employee respondents were aware, which contrasts with the fact that about a third of the

Materials and Methods
This study was conducted with members, employees, and sponsors of Futebol Clube do Porto (FCP), a team competing in the Portuguese top football league (Liga Portugal), acknowledged as the 6th strongest football league worldwide [69]. FCP is among the teams with the largest base of followers [70]. The quantitative research was based on an empirical study consisting of the dissemination by e-mail of an online survey among the FCP stakeholders. The survey was available online during five consecutive weekdays in June of 2020, and a total of 5917 responses were collected. To analyse the collected data, a descriptive statistical analysis using SPSS 25.0 was developed. The analysis procedure in this study conducted a frequency analysis to identify the representativeness of each group of respondents in the total amount of the sample, according to the research goals. Regarding the excluding variable, only 2090 of the responses were considered for hypothesis testing.

Results and Discussion
The findings from the empirical data are discussed in relation to literature from the two studies developed, focusing on the identification of the stakeholders who are aware of ESIS, regarding their classification on the most important topic of ESIS and their categorization on the organization's ESIS performance (Study 1), and determining the differences among the groups of stakeholders in the topics covered (Study 2).

Study 1
The objective of study 1 is triple: • what is the percentage of those who are aware of the environmental sustainability initiatives carried out (global and by group); • of the topics considered most relevant in terms of FC Porto's action, what is the ranking in terms of their importance; • by group, what is the global classification regarding the performance of the sports organization in the area of environmental sustainability.
Study 1 contains a question with an exclusion character, and two questions whose answers give rise to a classification by topic and by group. With the question "Are you aware of the initiatives developed by FC Porto in the area of environmental sustainability?", we can exclude those who are not familiar with the environmental sustainability initiatives. Regarding the total sample, it was possible to verify that the vast majority of the respondents (64.7%, n = 3827) were not aware of the environmental sustainability initiatives (ESIS) promoted by the organization. Considering the ones who admit knowing about the existence of these initiatives, in a group analysis (35.3%, n = 2090), about half (52.9%) of the employee respondents were aware, which contrasts with the fact that about a third of the members (34.9%) and only about a quarter of sponsors (25.5%) were aware of the initiatives carried out (Table 1). To test H1, checking if there are differences between the ESIS awareness level between the different groups of stakeholders (SEM-sponsors, employees, members), the chi-square test was used. It was found that there is a significant association between SEM and ESIS awareness, noting that this is significantly higher in the group of employees compared to the other two groups of stakeholders (p < 0.001).
As for the relevant topics of action for FC Porto in the scope of sustainability ((a) climate changes and energy consumption-CC; (b) environmental impact of sporting events-EI; and (c) promotion of health and well-being-HW), a Likert scale of five points was provided for the respondents to classify the level of importance given to each one of them. With regard to the sustainability topics covered, the "Health and Well-being" was the most valued by all stakeholders, synonymous with a maximized individual perspective of a global phenomenon such as sustainability. The results in Table 2 show that the health and well-being dimension is the most valorised sustainable form among the total of the sample (n = 2090) ( Table 2). To test H2, the Friedman test was calculated, revealing there is statistical significance in the assessments made by the stakeholders to the different levels of ESIS (p < 0.001). Regarding pairwise comparisons between ESIS levels (among SEM), it is possible to confirm H2, considering the existence of statistically significant differences in the HW dimension, compared to the CC (p < 0.001) and to the EI dimension (p < 0.001). However, considering H2a, H2b and H2c, it was possible to verify through the Friedman test that this trend was confirmed only in the case of members (p < 0.001).
Finally, for the question "How do you evaluate the performance of FC Porto in the area of environmental sustainability?", the respondents who know about its existence (n = 2090) could classify the performance in five categories: very good, good, medium, bad, very bad. Regarding a group analysis, we followed the classification trend of "very good" and "good", and added the respective classification percentages. The group of "employees" and "members" reached very high similar numbers (92.3% and 91.5%, respectively). The sponsors group stood at 84.5% (Table 3).
To test H3, the Kruskal-Wallis test was applied, confirming there are no significant differences between the stakeholders' groups (p > 0.05) regarding ESIS performance.

Conclusion
Sports organizations are credible in communicating messages related to the promotion of environmentally sustainable behaviors to the various stakeholders (see Table 3), but the level of knowledge of the messages must be improved for all stakeholders, particularly the sponsors (see Table 1). Overall, the environmental sustainability initiative on the topic of health and well-being is valued as the most relevant (see Table 2).

Study 2
The purpose of study 2 was to identify the differences of sustainability forms among groups of stakeholders (sponsors, employees, and members), regarding the topics of ESIS organizations.
Sponsors. We first analyze the group of sponsors. Regarding a group analysis, the topics that attained a higher mean in the case of sponsors were CC and EI with 4.15 (Table 4). In the light of these results, ESIS related with organizational and community forms were the ones more valorized by this group of stakeholders. Employees. Afterwards, we analyze the employees' group, the ones that have a greater daily experience of the club from a physical and professional perspective. Among the employees, with a mean of 4.13, the individual sustainability form of HW was the most valorized (Table 5).
Members. Finally, the group with the elements characterized as the ones with a high psychological and emotional connection to the club, the members group, was analysed.
Regarding what the importance given to the different topics of sustainability initiatives, members expressed the same trend as the employees group (i.e., mean of 4.13), valorizing the most the individual dimension of HW (Table 6).
To test Hypothesis 4, Kruskal-Wallis was calculated, confirming there is no significant statistical difference between SEM, regarding the importance given to the three ESIS levels (p > 0.05) ( Table 7).

Conclusion
Sponsors give more value to the sustainable organizational and community form of ESIS. Sponsorship is understood as a way to increase brand awareness. The fact that the sports organization carries out environmental sustainability initiatives provides leverage to the associated brand and may even reach less knowledgeable audiences. Following the results, employees and members give more value to the individual form of ESIS, characterized by an individual form. An intense identification with the sports organization, combined with the creation of a strong relationship, leads to the development of a high individualization on the part of those who spend more hours in the club (i.e., employees) and/or more emotionally connected to the club (i.e., members).

General Discussion
The vast majority of the respondents (64.7%, n = 3827) are not aware of the environmental sustainability initiatives (ESIS) promoted by the organization, confirming the conclusions of other studies [6]. Of those who were aware, the largest percentage goes to "employees", barely surpassing 50%. In sponsors, the overwhelming majority (74.5%) were not aware of the ESIS, which is indicative of the little importance (or attention) that this stakeholder employs to issues related to environmental sustainability. Members are the "great support" of sports organizations and, in the analysis of the results obtained in terms of awareness of the initiatives (34.9%), there is much to be done to increase the level of identification with the club, through better communication of the ESIS.
In the overall sample, stakeholders who were aware of the sports organization's sustainability initiatives mainly value the ESIS from a health and well-being point of view. Of the topics analysed under the environmental sustainability theme "climate changes and energy consumption", "environmental impact of sport events", and "health and wellbeing", the most valued form of sustainability was the individual, which refers to a more personal perspective in the interpretation of the sustainability topics in question [59].
Sport organizations are seen as credible in passing messages through ESIS. In fact, the data collected confirms previous studies [2,15,30,37]. As for performance in the area of environmental sustainability, we added the two highest ratings for each stakeholder group ("good" and "very good"). The results are very positive, obtaining a minimum value of 84.5% for sponsors and a maximum value of 92.3% attributed by employees. Noteworthy is the low degree of response percentage from sponsors (25%) who were aware of the ESIS performed. From a commercial and business perspective, having feedback on the money that is spent and the actions that are carried out is a sign of good practice.
There are no significant differences between the three groups under analysis. However, there is a tendency for sponsors to attach greater importance to organizational and community initiatives as sustainability forms, as the topics "climate changes and energy consumption" and "environmental impact of sports events" indicate. In this way, we have greater understanding by knowing the sponsors' opinions about sustainability actions, extending the work previously carried out [12,30]. The opposite trend is observed in employees and members, with an individual predominance characterized by a long-term change in attitudes and behaviors, observed in the topic "health and well-being". Interestingly, the community form is the least significant in these two groups, which is relevant as a result. These two groups are concerned with the extremes ("health and well-being" from an individual form and "climate changes and energy consumption" from an organizational form), with the community form of sustainability, which is more specific and contextualized, in last place.

Conclusions
This study focuses on ESIS and stakeholder analysis, regarding topics considered relevant to sports organization with defined objectives and measurement metrics [32]. In this study we were able to identify the percentage of stakeholders who were aware of the ESIS carried out by the club, the importance of the health and well-being focus in the ESIS, as well as the credibility of sports institutions in passing on messages related to environmentally sustainable behavior. Different stakeholder groups have different strategies depending on how ESIS topics are approached. The results of this study allow for a better understanding of the behavior of stakeholders and their positions according to sustainability forms, allowing the development of strategies and campaigns specifically aimed at different stakeholders. Managerial implications of the study may help the sports organizations to improve ESIS communication while raising awareness and participation, but, above all, having strategies, clear objectives, measures of success, or specific summaries of what was intended to be achieved [5][6][7].
Regarding study limitations, we may refer the fact that it is focused on only one case. However, presenting avenues for future research, the research may be extended to other sports organizations in Portugal and in other European countries, and professional sports organisations from other kinds of sports, and also national and international athletic federations and leagues, with the goal of developing a comparative analysis that may bring more complete results regarding the subjects in analysis.