“Green” Information Promotes Employees’ Voluntary Green Behavior via Work Values and Perceived Accountability

: A range of di ﬀ erent approaches has been used to involve employees in green workplace initiatives. One example of such an approach is to spread awareness by displaying “green” information concerning work-related environmental protection and sustainability information on organizational bulletin boards. The study aims to examine how green display rules and felt accountability inﬂuence the relationship between new-generation employees’ work values and green behavior. There were 567 Chinese millennial employees who participated in this study. The results showed that intrinsic preference, interpersonal harmony, innovative orientation, and long-term development had a positive inﬂuence on employees’ green behavior through the e ﬀ ect of felt accountability. Besides, the more green information displayed, the stronger the e ﬀ ect of intrinsic preference, interpersonal harmony, and long-term development on employees’ green behavior. This study provides valuable insights for managers to understand the work values of the new-generation employees and, in turn, improve their green awareness, which can help execute corporate social responsibility.


Introduction
Threats to the environment have become some of the most important issues facing the world [1,2]. Organizations nowadays worry more about the natural environment than they did in the past [2,3]. Because of the growing concerns about the long-term adverse effects of environmental degradation and climate change, companies over the world are endeavoring to support environmental responsibility [1,4]. In addition, companies may benefit from increasing sales, branding recognition, and desirable employee outcomes if they successfully employ green policies to promote environmental sustainability [2,5,6]. Employees are those who implement organizational green policies; therefore, it is necessary for organizations to promote and ultimately change their behaviors and ensure that such behavior is consistent with organizational green goals [3,7].
Behaviors employees engage in that are aligned with environmental sustainability are referred to as "green" behaviors [3]. This definition includes both organizational citizenship behaviors for the environment (OCBE) [8] and task-related pro-environmental behavior [9]. Ones and Dilchert [3] note that even though green behaviors are mostly voluntary, it is important to consider behaviors related to job tasks. Therefore, in line with Kim et al., [1] which builds on Boiral [10], we view voluntary green workplace behavior as a type of organizational citizenship behavior. Our theoretical model is grounded in the corporate social responsibility literature, which suggests that some normative motives may affect the participation of social responsibility, such as the match between personal values and the issues concerned [4]. explore the relationship between work values and felt accountability among Chinese millennial workers. More specifically, we attempt to examine whether the work values of Chinese millennial employees motivate their value-consistent green behaviors through perceived felt accountability. In addition, we seek to extend the understanding of the contextual factors that impact value activation by focusing on green display rules, which refer to employees' perceptions of job demands for environmental sustainability. As green information concerning environmental protection and sustainability is displayed on the organizational bulletin boards, we propose that green display rules play a key role in the activation of work values and the values-to-workplace behavior relationships. Second, because of the contextualized nature of work values, new generations of Chinese employees born in the Internet era are deeply influenced by the global economy, and hence may demonstrate unique and multidimensional work values, such as focusing on profit returns and internal preferences, emphasizing equality, justice and long-term development [25]. With the rise of the sharing economy, millennial employees represent a significant part of the Chinese workforce and have potential opportunities to redefine and shape organizations [35]. While the majority of studies on voluntary green workplace behavior were mainly conducted in Western countries, the findings might not be applicable to Chinese millennial employees as they demonstrate different characteristics and behaviors compared with older generations and millennials living in other countries [25,35,36]. Given the Chinese workforce is the largest in the world, it is worth discovering how to promote Chinese millennial employees' green workplace behaviors based on their unique work values. However, to our best knowledge, no prior studies have explored the relationships between work values of the Chinese millennial generation and voluntary green workplace behaviors, the underlying motivational mechanisms, as well as how contextual factors influence such relationships. By identifying felt accountability and displaying green rules that may stimulate employees' underlying motives for green behaviors, our work adds another theoretical route for inducing employee voluntary green workplace behaviors, and also contributes to an improved understanding of OCBE.

Research Model and Hypotheses
The study aimed to examine how green display rules at work influence the relationships between work values, felt accountability, and green behavior among a new generation of employees. Drawing on self-verification theory [32,33] and social information processing perspectives [34], we developed our research model (see Figure 1) and hypotheses as elaborated in the following sections. Chinese millennial workers. More specifically, we attempt to examine whether the work values of Chinese millennial employees motivate their value-consistent green behaviors through perceived felt accountability. In addition, we seek to extend the understanding of the contextual factors that impact value activation by focusing on green display rules, which refer to employees' perceptions of job demands for environmental sustainability. As green information concerning environmental protection and sustainability is displayed on the organizational bulletin boards, we propose that green display rules play a key role in the activation of work values and the values-to-workplace behavior relationships. Second, because of the contextualized nature of work values, new generations of Chinese employees born in the Internet era are deeply influenced by the global economy, and hence may demonstrate unique and multidimensional work values, such as focusing on profit returns and internal preferences, emphasizing equality, justice and long-term development [25]. With the rise of the sharing economy, millennial employees represent a significant part of the Chinese workforce and have potential opportunities to redefine and shape organizations [35]. While the majority of studies on voluntary green workplace behavior were mainly conducted in Western countries, the findings might not be applicable to Chinese millennial employees as they demonstrate different characteristics and behaviors compared with older generations and millennials living in other countries [25,35,36]. Given the Chinese workforce is the largest in the world, it is worth discovering how to promote Chinese millennial employees' green workplace behaviors based on their unique work values. However, to our best knowledge, no prior studies have explored the relationships between work values of the Chinese millennial generation and voluntary green workplace behaviors, the underlying motivational mechanisms, as well as how contextual factors influence such relationships. By identifying felt accountability and displaying green rules that may stimulate employees' underlying motives for green behaviors, our work adds another theoretical route for inducing employee voluntary green workplace behaviors, and also contributes to an improved understanding of OCBE.

Research Model and Hypotheses
The study aimed to examine how green display rules at work influence the relationships between work values, felt accountability, and green behavior among a new generation of employees. Drawing on self-verification theory [32,33] and social information processing perspectives [34], we developed our research model and hypotheses as elaborated in the following sections.

Work Values and Employee Green Behavior
Ones and Dilchert [3] define employee green behavior as scalable actions and behaviors employees engage in that contribute to environmental sustainability. Employee green behavior includes activities such as saving energy, using resources efficiently, avoiding waste, recycling, and conserving water [3,37]. Kim et al. [1] define voluntary green workplace behavior as employee actions that are environmentally sustainable for the employer organization but are not subject to any formal environmental management policies or systems. The voluntary green behaviors that occur in workplace environments and the underlying motivations that guide such behaviors may have implications for how individual differences and social dynamics affect voluntary green behavior.
The study of work values stems from people's discussion of the concept of values. Most researchers believe that values are a choice of goals or guidelines and standards of long-term stability, and that values evolve with cultural, social, and personality changes [38][39][40]. In other words, work values may differ due to cultural divergence which may result in different ultimate actions/behaviors. For example, Chinese work values demonstrate that the new generation of Chinese employees pay attention to personal interests, emphasizing the fulfillment of intrinsic preferences and interpersonal harmony, and expecting to achieve a complete career through long-term development and self-innovation.
Self-verification theory [32,33] provides some indication as to why personal values provide insights into the motivational underpinnings of prosocial behaviors. According to self-verification theory, people seek out and create opportunities to verify their self-beliefs, and to reconcile their self-beliefs with the perceived views of others if there exist differences. When people's behaviors are aligned with their self-views, they experience feelings of control and confidence; on the other hand, when they engage in behaviors that contradict their self-views, they feel anxious and uncertain [41]. As such, engaging in value-consistent behavior validates beliefs about the self and thus enhances self-confidence [14]. Hou and Lu [25] argue that the work values of intrinsic preferences, innovative orientation, and interpersonal harmony encourage the new generation of employees to maintain positive self-views. When employees work in a manner that is consistent with their positive self-views to create feelings of confidence, it may lead to interpersonal altruism in the workplace [41], and, in turn, promote employees' prosocial behavior, such as green behavior. When working in an environment that matches their self-values, employees with intrinsic preference will have greater value verification and, thus, engage in altruistic green behavior consistent with positive self-views. When a utilitarian-oriented employee has a high long-term orientation, he/she expects to receive opportunities for promotion and career development, and to be able to pursue his or her accomplishments over a long-term career life, rather than in the short run [23]. In other words, in order to weaken the uncertainty and insecurity in the workplace competition, individual employees with utilitarian orientation (i.e., material rewards) and long-term development values (i.e., occupational prospects over a long period) are more willing to engage in green behavior, in order to maintain stable team relations, and strengthen their positive self-views. Therefore, we propose the following: Hypothesis 1. New generation employees' work values (utilitarian orientation, intrinsic preference, interpersonal harmony, innovative orientation, and long-term development) have an influence on employee green behavior.

Felt Accountability as Mediator
Felt accountability refers to the perceived expectation that one's decisions or actions will be evaluated by some salient audience(s) [42]. The resulting rewards or sanctions are believed to be contingent on this expected evaluation [42][43][44]. Employee accountability is important in that it is calculated in terms of positive behavior that contribute to the success of the organization [43,44]. Accountability can be divided into two types: Procedural versus outcome accountability [45]. Under procedural accountability, individuals are held answerable largely for the standards and/or processes they develop. On the other hand, under outcome accountability, individuals are held answerable for the quality of their decisions, or the quantity of goods/services produced, rather than the processes used to secure these outputs. To sum up, when individuals are accountable, they are held answerable for their own behaviors. These "accounts" are important, as actors seek to use them in order to protect and enhance their self-images. This is so because individuals are concerned about their image and status and seek approval in the eyes of others [28,29].
According to the social information processing perspective [34], individuals make sense of their environment based on processing the social information in the workplace. Such sense-making takes place in a social environment in which norms and expectations influence the rationalization of behavioral development, which can be described as a process of legitimating behavior. Because people are driven to build and maintain their self-images [29], this motivation has a major impact on a person's response to specific responsibility requirements. This influence has both positive and negative effects, because people tend to view individuals in a way that is consistent with the image they hold and want to portray. People develop acceptable justifications for their own behaviors as a way of making such behavior meaningful. Justifications serve to provide a reason for performing any action which is consistent with the personal values. Therefore, such justifications are necessary for making sense of related behaviors. In other words, felt accountability is a necessary mechanism for an individual employee to engage in value-consistent interpersonal behaviors (i.e., self-verifying process) as it creates cognitive consistency and provides an opportunity to receive evaluations that confirm employees' self-views. When employees attempt to engage in altruistic green behaviors that are consistent with their work values, they are held answerable for their own behaviors first, as a mechanism to activate their cognitive awareness, and in turn create an opportunity for them to receive evaluations that confirm their own self-views. Therefore, we propose the following: Hypothesis 2. New generation employees' perceived felt accountability mediates the relationship between work values and green behavior.

Display Rules as Moderator
Display rules have been conceptualized as role requirements of particular occupational groups (e.g., emotional worker) and interpersonal job demands [46,47]. In the current study, we focused on the definition of interpersonal job demands as we studied employee green behavior at workplaces in general, instead of limiting to a specific occupation. We defined green display rules as the perceived job demands for employees to display green-related behaviors in one organization. The job-demands approach allowed for variance in the interpersonal requirements of work to exist within occupational categories and reside in specific jobs [47]. For example, interpersonal job demands may refer to the effective interactions with clients in a service context, because the display rules regulate the delivery of the interaction between the service representative and the client. Supervisors are likely to be important definers of display rules at the workplace, given their direct influence on employees' beliefs about job performance expectations [48]. According to social information processing theory [34], employees' perception of interpersonal demands inherent in display rules may depend on supervisors' views on how important they are.
Social information processing theory suggests that employees' perceptions of job demands are influenced by what people around them think. In other words, employees build their perceptions and attitudes in society based on social cues in the workplace, which in turn affects their behavior [34]. For example, supervisors who place greater importance on interpersonal job demands may signal to employees that they are important to the job, and then employees may mirror their supervisors' concerns and pay more attention to the interpersonal aspects of their job [34,46]. The significance and importance of interpersonal work requirements may trigger employee self-regulation activities to monitor their own compliance with display rules. Therefore, contextual factors such as display rules play an important role in activating values and strengthening or weakening values-to-behavior relationships [15,49]. The recognition of relevant cues raises self-awareness about personal values and self-concepts. In addition, cues suggesting social acceptability or encouragement contribute to value expression, while cues suggesting social inadequacy restrict value expression [15]. That is, when an individual employee's work values are consistent with the given green display rules, their values are perceived as acceptable and encouraged in the organization, which facilitate their value-verification and in turn strengthen the values-to-behavior relationship. On the other hand, if their work values are perceived as socially inappropriate in the organization, the values-to-behavior relationship may be weakened. For example, for the new generation of employees who value interpersonal harmony, in order to obtain the legitimacy and status of the organization, they will ensure their behaviors to be consistent with the organizational requirements or the expectations of the work group; therefore, they are more willing to participate in environmental protection and resource recovery in the workplace. For new generations of employees who value their future development in the organization, it is important for them to follow the organization's norms and requirements in order to increase their visibility, identity, and status in the organization. In addition, complying with environmental and resource maintenance requirements is not only beneficial to the employees themselves, it is also conducive to the long-term development of the organization in line with corporate social responsibility. Therefore, we propose the following: Hypothesis 3. Green display rules moderate the relationship between new generation employees' work values and green behavior.

Procedure
We contacted human resources managers to inquire as to whether they were willing to take part in our study, and four enterprises in China agreed. The data were collected at two time points. At Time 1, potential participants received an unsealed envelope that contained a cover letter explaining the purpose and procedure of this study and assuring confidentiality, and a copy of the survey form. They were requested to provide informed consent and were assigned a unique code that allowed us to match the data collected from them later at Time 2. During the first data collection, 783 respondents completed the survey, including scales of work values, green display rules, and personal information. Respondents were requested to put the completed survey forms into the envelopes, seal them, and send back to us. Four weeks later, at Time 2, all 783 employees were contacted to complete the second survey in order to assess their felt accountability and green behavior. Out of 783 millennial-generation white-collar employees, 567 provided usable responses.

Participants
The 567 participants were from four Chinese companies in the information technology (23%), telecommunication (18%), financial (23%), and service (36%) industries, respectively; 56% of the employees were male and 44% were female. Participants' ages ranged from 22 to 38 years (M = 28.3, SD = 6.33). These participants were born from the 1980s to 2000, known as millennials, or the 'New Generation' [21,22,35]. Being born under the one-child policy in China (since 1980) has made Chinese millennials behave differently from older generations in China and millennials in other countries and demonstrate different characteristics, such as having a strong need for self-improvement and a stronger awareness of their contributions at work and at home [35]. Out of them, all received a bachelor's degree or above. They had a mean job tenure of 6.63 years (standard deviation = 5.17 years) and 24% of them were supervisors.

Measures
The survey was conducted in Chinese after being translated from the initial English scales. To ensure the accuracy of the measures, we adopted the translate-back-translate procedure [50].
New generation employees' work values. The 20-item work values scales developed by Hou et al. [23] were incorporated to measure the work values of Chinese new generation employees, including five dimensions (utilitarian orientation, intrinsic preference, interpersonal harmony, innovative orientation, and long-term development), and each dimension comprised four items and was measured using a 5-point Likert scale (1= very unimportant to 5 = very important).
A sample item of utilitarian orientation is "How important is increasing compensation for you?" The Cronbach's α in this study was 0.83. A sample item of intrinsic preference is "How important is your job consistent with your own interests for you?" The Cronbach's α in this study was 0.87. A sample item of interpersonal harmony is "How important is working in a harmonious environment for you?" The Cronbach's α in this study was 0.82. A sample item of innovative orientation is "How important is working in a challenging environment for you?" The Cronbach's α in this study was 0.84. A sample item of long-term orientation is "How important is a desirable career perspective for you?" The Cronbach's α in this study was 0.87.
Felt accountability. We adopted the eight-item scale developed by Hall et al. [43] to measure employees' felt accountability, using a 7-point Likert scale (1= strongly disagree to 5 = strongly agree). A sample item is "I am held very accountable for my actions regarding environmental maintenance and resource recycling at work." The Cronbach's α in this study was 0.74.
Green display rules. We developed a three-item scale of green display rules to measure employees' perceived level of green display rules by adapting Hochschild's [51] display rule demands and Kim et al.'s [1] work group green advocacy measurement, using a 6-point Likert scale (1 = "never" to 6 = "always"). A sample item is "We are required to reduce, reuse, and recycle office supplies in the workplace." Complete scale items can be found in the Appendix A. The Cronbach's α in this study was 0.80.
Voluntary green workplace behavior. We adopted the six-item scale developed by Kim et al. [1] to measure new generation employees' voluntary green workplace behavior, using a 6-point Likert scale (1 = "never" to 6 = "always"). A sample item is "I avoid unnecessary printing to save papers" and "I recycle reusable things in the workplace". The Cronbach's α in this study was 0.78.
Control variables. As individual demographic characteristics, such as gender, age, and tenure, have proved in previous studies [23] to be effective predictors of employee extra-role performance, we controlled for each of these variables. Age and tenure were measured in years, and gender was coded as 1 = male and 2 = female.

Data Analysis
We employed hierarchical regression analysis using SPSS 22.0 and Amos 17.0 to test the main effect of employees' work values on voluntary green behavior, and the moderating effect of green display rules on the relationship between them. The measurement instrument was validated following Boiral & Paillé's suggestions [52]. First, confirmatory factor analyses (CFA) were conducted to validate the factor structure. The baseline measurement model (Model 1 in Table 1), into which all study variables were loaded in their respective categories (i.e., utilitarian orientation, intrinsic preference, interpersonal harmony, innovative orientation, long-term development, felt accountability, green display rules, and green behavior), was formed. Then, utilitarian orientation, intrinsic preference, interpersonal harmony, innovative orientation, and long-term development were combined into one factor (since these five factors are the dimensions of work values); therefore, the four-factor model (Model 2 in Table 1) was also formed, followed by a three-factor model (Model 3 in Table 1) which combined utilitarian orientation, intrinsic preference, interpersonal harmony, innovative orientation, and long-term development into one factor, and felt accountability and green display rules into another. In addition, the other three factors (felt accountability, green display rules, and green behavior) were also combined into one factor, resulting in the two-factor model (Model 4 in Table 1). Finally, all factors were combined into a one-factor model (Model 5 in Table 1). These five models were examined through a series of indices for assessing the construct validity of the measures. The goodness-of-fit indices adopted in the model were χ 2 , the root mean square error of approximation (RMSEA), the standardized root mean square residual (SRMR), the Tucker-Lewis index (TLI), and the comparative fit index (CFI). We evaluated model fit using CFI, RMSEA, and SRMR as suggested by Hu and Bentler [53]. The cutoff for CFI is 0.90 or more, and the cutoff for RMSEA and SRMR is 0.80 or less. Table 2 presents the correlations, means, and standard deviations of the study variables.

Results
Following Aiken and West [54], a hierarchical regression model was employed to verify the proposed hypotheses. Demographic variables such as gender (0 = female and 1 = male), age, job tenure (years), and job position (0 = subordinate, 1 = supervisor), were included in the analysis as controls. The hypothesized model using confirmatory factor analysis exhibited a good fit to the data as shown in Table 1. The hypotheses about the moderating effects of green display rules and the mediating effect of felt accountability were subsequently verified (Tables 3 and 4). In addition, the effect of work values on green behavior under the influence of varying degrees of green displayed rules was illustrated (Figures 2-4).

Common Method Variance Check
Our data collection strategy of measuring constructs at different points in time and the multilevel nature of our model mitigated some concerns that arise in studies that rely on survey data. Besides, according to Harris and Mossholder's [55] perspective, the valid theoretical model in this study could partially exclude common method variance. Overall, our strategy of collecting data at different points in time and the cross-level nature of our model helped minimize the likelihood that common method variance accounts for the substantive findings or the observed relationships among the variables. Note, n = 567, * p < 0.05, *** p < 0.01, *** p < 0.001. UO = utilitarian orientation, IP = intrinsic preference, IH = interpersonal harmony, IO = innovative orientation, LTD = long-term development, FA = felt accountability, GDR = green display rules, GB = green behavior, df = degree of freedom.

Hypothesis Examination
In Hypothesis 1, we proposed that new generation employees' work values would be positively related to their voluntary green workplace behaviors. As illustrated in Table 3, the positive effects of four of the five work values measures were supported (p < 0.01) with the exception of utilitarian orientation.   In Hypothesis 2, we argued that felt accountability would mediate the relationship between new generation employees' work values and voluntary green workplace behaviors. To examine the mediating effect of felt accountability, we followed Baron and Kenny's [56] and Preacher, Rucker, and Hayes' [57] procedures. As shown in Table 4, out of five work values, intrinsic preference, interpersonal harmony, innovative orientation, and long-term development had significant indirect effects on green behavior.
In Hypothesis 3, we assumed that green display rules would positively moderate the relationship between new generation employees' work values and their voluntary green workplace behaviors. Results in Table 3 (Models 4 and 5) show that the effects of new generation employees' work values (i.e., intrinsic preference, interpersonal harmony, and long-term development) on their voluntary green workplace behaviors varied when employees perceived a differing degree of green display rules. A simple slope was used to further examine the moderating effect [54]. As shown in Figure 2, when the level of perceived green display rules was high, the positive relationship between intrinsic preference and green behavior was significant; when the level of green display rules was low, the positive relationship between intrinsic preference and green behavior was also significant. This suggests that employees' intrinsic preferences have a stronger effect on their voluntary green workplace behaviors when they perceived a higher degree of green display rules; when the perceived level of green display rules was low, the effect of intrinsic preference on voluntary green workplace behaviors became weaker. Similarly, as Figure 3 shows, when the level of green display rules was high, the positive relationship between interpersonal harmony and green behavior was strengthened; when the level of green display rules was low, the positive effect of interpersonal harmony on green behavior was lessened. As displayed in Figure 4, when the level of green display rules was high, the work value of long-term development had a stronger effect on green behavior; when the level of green display rules was low, the positive relationship between long-term development and green behavior was also lessened. Thus, Hypothesis 3 was supported except for utilitarian and innovative orientation values.
In addition, to assess the potential issues with multicollinearity, variance inflation factor (VIF) tests were run for all models in Table 3. In all the cases, the mean was below the suggested level (i.e., 2.1) at which problems can occur [58]. Second, the correlations between all variables in the model were relatively small and were well below 0.80 at which multicollinearity may be considered a problem [59]. The correlation matrix can be found in Table 2.

Discussion
The research results showed that except for utilitarian orientation, new generation employees' work values of intrinsic preference, interpersonal harmony, innovative orientation, and long-term development had a significant and positive influence on voluntary green workplace behavior. This is consistent with Hou and Lu's [25] and Swann et al.'s [41] suggestions that the work values of intrinsic preferences, innovative orientation, and interpersonal harmony encourage new generation employees to maintain their positive self-views and work in a manner that is consistent with their positive self-views, which lead to interpersonal altruism in the workplace and in turn promote their prosocial behavior (i.e., green behavior). Moreover, our research finding aligns with the argument that individual employees with long-term development values are likely to engage in green behavior, in order to maintain stable team relations, and strengthen their positive self-views [23]. Nevertheless, our results did not support a significant relationship between utilitarian orientation work value and green behavior. This is probably because millennial-generation employees with a utilitarian orientation work value may focus more on their in-role performance in order to attain material goods or benefits [60], instead of participating in green behavior, which may not generate immediate benefits for them. Specifically, utilitarian orientation has a stronger impact on in-role performance than it does on extra-role performance [16]. Compared to high extra-role performance, which benefits employees' indirect and invisible interests, superior in-role performance increases immediate interests, such as higher salary and bonuses [23]. Therefore, utilitarian employees are highly motivated to focus on in-role performance, rather than prosocial behaviors.

Discussion
The research results showed that except for utilitarian orientation, new generation employees' work values of intrinsic preference, interpersonal harmony, innovative orientation, and long-term development had a significant and positive influence on voluntary green workplace behavior. This is consistent with Hou and Lu's [25] and Swann et al.'s [41] suggestions that the work values of intrinsic preferences, innovative orientation, and interpersonal harmony encourage new generation employees to maintain their positive self-views and work in a manner that is consistent with their positive self-views, which lead to interpersonal altruism in the workplace and in turn promote their prosocial behavior (i.e., green behavior). Moreover, our research finding aligns with the argument that individual employees with long-term development values are likely to engage in green behavior, in order to maintain stable team relations, and strengthen their positive self-views [23]. Nevertheless, our results did not support a significant relationship between utilitarian orientation work value and green behavior. This is probably because millennial-generation employees with a utilitarian orientation work value may focus more on their in-role performance in order to attain material goods or benefits [60], instead of participating in green behavior, which may not generate immediate benefits for them. Specifically, utilitarian orientation has a stronger impact on in-role performance than it does on extra-role performance [16]. Compared to high extra-role performance, which benefits employees' indirect and invisible interests, superior in-role performance increases immediate interests, such as higher salary and bonuses [23]. Therefore, utilitarian employees are highly motivated to focus on in-role performance, rather than prosocial behaviors.
The results of the moderating effect of green display rules on the relationship between new generation employees' work values and their voluntary green workplace behaviors confirmed our argument that display rules play an important role in activating values and strengthening or weakening values-to-behavior relationships [15,49]. The possible reason why the moderating effects of green display rules on the relationships between utilitarian and innovative orientation work values and their voluntary green workplace behaviors were not significant is possibly because of the value inconsistency. As described previously, employees with a utilitarian orientation work value tend to pay more attention to the realization of their own interests and values. The so-called value realization is based on achieving their own internal preferences and interests, rather than gaining recognition and respect from others by helping people or meeting organizational norms and requirements. Similarly, employees with an innovative orientation work value may have the tendency to challenge the tradition [16]. While the Chinese cultures emphasize the value of tradition and harmony, an innovative-oriented employee may find it hard to fit in a working environment that requires employees to follow specific rules in order to regulate their green-related behaviors. As a result, they neglect the social cues from their external environment-organization or group (the emphasis on and requirements for environmental protection and resource recycling, and, hence, they would be less likely to engage in prosocial green behaviors).
Organizations are increasingly being pressured to improve their environmental performance. Evidence from our research suggests that including felt accountability and green display rules may contribute to employees' voluntary green workplace behaviors. For example, when an organization's website or virtual bulletin board publishes the rules and requirements for environmental protection and resource recycling, new generation employees who pay attention to their own preferences and interests can be more aware of their work values and job requirements, and in turn are more likely to comply with the display rules.
The new generation of employees was born in the era of environmental awareness and resource conservation. Enterprises nowadays no longer consider pursuing profits as their primary goals. Instead, they pay attention to issues related to environmental protection and resource recovery. Although the behaviors of new generation employees are more likely to be driven by their own interests and preferences, their values are also deeply influenced by contemporary social, economic, and environmental changes. Therefore, the work values of the new generation employees are rooted in a high degree of environmental awareness, and thus they are more likely to display green behaviors.

Limitations and Directions for Future Research
Of course, this study is only one step forward in the search for knowledge about how to promote environmentally friendly behavior in the workplace. Given the increasing and diverse forms of environmental degradation, additional research is indeed needed. First, the ability to generalize from this research is limited as the subjects in this study came from a single country (i.e., not including a cross-cultural sample), albeit with a strong cultural focus. Our suggestion for future research is to test the generalizability of our research findings. In addition to differences in the cultural, regulatory, and physical environments that differentially affect companies in different countries, research indicates that environmental beliefs, knowledge, and attitudes vary around the world [61]. For example, in Western countries such as the United States, environmental values are linked with altruistic concepts which run counter to traditional values, while in Asian countries such as Japan, environmental values are strongly related to traditional values [61]. Second, our study was limited to investigating the effects of individual factors (i.e., at the micro level) on employee pro-environmental behaviors. Therefore, research also is needed to improve our understanding of how contextual differences at the macro level influence voluntary green workplace behavior. For example, future research in other institutional contexts may yield different results. Third, this research focused on voluntary green behaviors in the workplace related to individual work values and, as such, was dependent on the organizational setting [37]. The findings are, therefore, unable to address questions regarding how individuals engage in different types of pro-environmental behaviors and consistency across different settings [62]. Fourth, our measure of voluntary green behaviors in the workplace was somewhat limited in scope, as acknowledged in Kim et al. [1]. More comprehensive measures of green behavior are needed to further improve the insights. Therefore, we encourage future research that tests the robustness of our findings by using alternative forms of measurement [9]. In addition, it would be worth verifying the cross-cultural applicability of the millennial generation's work values and its impact on individual outcomes. Finally, applying alternative data collection methods (e.g., objective indices of environmental performance metrics) would allow for stronger conclusions to be drawn about our model's robustness.

Conclusions
Drawing on self-verification theory [32,33,41] and social information perspectives [34], this study examined the main effect of new generation employees' work values on their voluntary green workplace behaviors, as well as exploring the mediation effect of felt accountability and the moderating effect of green display rules on the relationship between them. The findings deepened our understanding of the relationship between Chinese millennial employees' work values and their voluntary green workplace behaviors. For example, while organizations are increasingly being pressured to improve their environmental performance, evidence from our research suggests that displaying green rules may contribute to employees' voluntary green workplace behaviors by raising employees' awareness of their work values and social norms. Given the Chinese workforce is the largest in the world and millennials have become an important part of this workforce, this study can provide international human resource managers with valuable information, helping them encourage employees' green behaviors in the workplace.