5.1. Bibliographic Sample Analysis
From a sector perspective, SR has been explored within the education sector [
79,
80], the water sector [
81], the oil and gas sector [
82,
83,
84,
85,
86], the logistics sector [
87], and the health sector [
88]. [
89] highlights the usefulness of the industry-specific framework provided by the Sustainability Accounting Standards Board for corporate SR. This framework has demonstrated the ability to link sustainability with financial performance, thereby improving returns for shareholders while considering risks and opportunities. The growing interest of shareholders in ESG issues and data allows for better analysis of company performance and allocation of economic capital. Investor-focused ESG reporting can benefit corporations, shareholders, and society as a whole, encouraging companies to be more responsible global citizens and fostering sustainable economic growth. Ultimately, businesses have the potential to drive the transition to a stronger and more resilient global economy [
89]. [
88] offer perspective from the Sustainable Development Unit. This unit is responsible for implementing and monitoring sustainable policies in the National Health Service, a large and complex healthcare system. They work to integrate sustainability practices throughout the organization. Sustainability reporting is essential for oil and gas companies. It allows them to outline how they address crucial matters like climate change and energy through their long-term plans and ongoing initiatives. In addition to enhancing external trust and confidence, the reporting process, which involves engagement with stakeholders, data collection, analysis, communication, and results, offers extensive opportunities for enhancing performance [
84]. [
86] concluded that oil companies are increasingly embracing Carbon Management practices. This involves addressing various challenges such as estimating greenhouse gas (GHG) emissions, taking into account external factors, future allocations, and limits, promoting low-carbon development, and implementing mitigation measures. Globally, there are new developments in energy, fuel consumption, and emissions taxes. Nations are implementing controls on emission inventories and forecasts for national planning purposes. This paper covers the development of GHG inventory and prediction, GHG accounting and information systems, climate protection policies, protocols, scientific assessments, sustainability reporting, and the potential benefits to stakeholders and the industry. It also addresses new regulatory requirements, sustainability, economic development, climate change, carbon management opportunities for service providers, and other climate change-related issues including scientific complexity, government policies, international debates, and competitive pressures. Carbon Management is becoming a reality for oil companies, and it is advantageous for organizations to adopt a proactive approach to be competitive, effective, and credible. This approach will yield first-mover benefits, foster innovation, and technology development, and influence global financial systems. The paper [
86] aimed to share experiences and address actions for tomorrow. After sixteen years we are still debating sustainability issues, which are becoming more and more important nowadays.
Globally, the disclosure of greenhouse gas emissions and energy usage has significantly increased. This is largely due to a rise in sustainability reporting, growing concerns about climate change, and the implementation of new legislation and taxes. Various stakeholders such as audit committees, management, and internal and external auditors, all have a potential role concerning these disclosures. [
90]'s research specifically focuses on the role of internal auditors. Through 29 interviews with senior audit committee members, senior accountants, in-house internal auditors, and partners specializing in internal audit, the authors aimed to understand the current and future roles of internal auditors in greenhouse gas and energy reporting. They also examined the level of involvement of audit committee members in such reporting. Findings align with certain corporate governance theories, but no single theory can fully explain the results obtained.
Climate change is discussed in [
91]’s chapter from the perspective of socially responsible investing. Many analysts increasingly analyze the financial risks and benefits connected with climate change when analyzing a firm, as well as the corporate response to climate change at various levels of governance. Because such evaluation is dependent on accurate information, three initiatives to promote climate change openness are discussed. Furthermore, social investment experts have impressed on firm management their concern for climate change as a corporate duty through dialogue and shareholder resolutions. Because of increased sensitivity to the interaction of social, environmental, and financial aspects, socially responsible investment analysts have been able to better appreciate the potential risk implications of climate change. Indeed, GRI standards are discussed already for a long time. Companies may face direct consequences from extreme weather events and climate change, such as damage to physical assets, higher insurance claims, or loss of core business. firms that make a point of qualifying reductions for trading credit, as well as firms that focus on cost savings connected to excellent energy management, may profit financially. The GRI aims to encourage businesses all around the globe to utilize a consistent framework for reporting on sustainability concerns. The GRI publishes Sustainability Reporting Guidelines, which comprise basic reporting concepts and essential indicators. Social investment analysts use their connections to corporations to raise a variety of corporate responsibility concerns [
91].
[
73] infer, by analyzing three companies' (2 from Mexico and 1 from the US) sustainability reports, to which degree they address economic, ecological, and social issues. From the intra-linkages found they recommend the time dimension to be analyzed to ensure sustainable development. Thus, the analysis through time by using panel data becomes imperative with the need for deeper sector, country, and region assessment of sustainability reporting. [
92] proposed a measurement of the materiality of ESG reported by Latin American listed companies (65 in 2017 and 67 in 2018) from different economic activity sectors. Their article opens the debate as to whether disclosed information responds to the stakeholder's needs or if it just serves the company's interests, suggesting complementing their qualitative study with the analysis of stakeholders’ engagement processes in the context.
[
93] applied content, ratio, statistical data, and regression analysis methods using data from 49 Czech Republic and 40 Slovak Republic companies' annual financial reports for the year 2014. Results indicate that few companies report environmental and social issues comprehensively. Company size drives upward the relative share of environmental and social disclosure in the total disclosure, whereas company affiliation to a high-profile industry increases the relative share of environmental disclosure. Moreover, the total amount of information disclosed increases economic, environmental, and social disclosure, and the authors found that reporting considering IFRS increases social disclosure practices. Previously, [
94]'s conceptual paper creates a sustainability index for manufactured products. This index could allow businesses to better measure, manage and use their available resources, while also allowing a better firm performance. More recently, [
95] analyze the responses of Canadian residents to a survey to find that respondents globalized sustainability reporting standards and the creation of Sustainability Standards Boards, aligned with worldwide citizen’s responses. These are meant to help for a better sustainable future world and thus should be pursued.
[
96] present a literature review of SR and ESG disclosure, and their effects on firm performance. Conclusions point to an increased trend in publishing from 2010 and that most studies are applied to developed economies such as Italy, England, the USA, and China. Sustainability and sustainability reporting are pointed as prominent research themes, whereas greenwashing and climate change were found to be less focused by the existing research. The focus of the existent research has been placed on ESG disclosure, SR, and firm performance considering firm value and leverage, with a considerable amount of studies including board and gender diversity, with inconclusive results but the majority linking SR and firm performance negatively. [
97] surveyed top management teams of firms listed in the Stockholm stock exchange, They found that the management of climate-change risks seems to be a residual issue for most firms, with low active engagement of both managers and boards of directors. Thus, companies are advised to revise theoretical and empirical thoughts of climate-risk management and climate risks' role in the newer policy setting. Previously, [
98] study reviewed the definition and identification of materiality. Four screening methods were proposed, being that of GRI’s Sustainability Disclosure database the one recommended considering its balanced disclosure of topics like management, economic, environmental, and social sustainability.
[
99] finds that accountants are giving a more significant role in climate change risk disclosure, but still, there is a lack of appropriate care for climate change issues. [
100] presents a report on the primary drivers of corporate action on sustainability. Conclusions enforce the idea that peer pressure is more effective than treaties, laws, or regulations for companies' involvement. The author highlights that the term climate change remains a contentious issue and that companies would be wise if they would refer to and report all sustainability-related actions. [
101] inclusively outlines the basis in the EU treaties for the reform of EU company law, pointing to the risks of continued unsustainability. It highlights the need to change legislation in Europe to force SR by companies, showing them also how to conform to the requirements. Indeed, at the beginning of 2023, these sustainability reports for European companies started being mandatory. [
83] point out that firms in environmentally sensitive industries, such as the oil and gas sector, are more scrutinized for ESG performance, mainly if related to climate change. They collected a sample of 30 oil and gas sustainability reports and ESG reports for 19 financial institutions in Alberta and performed a content analysis. Conclusions point to a lack of standardization regarding ESG investor demands and company disclosure. [
102] tried to infer if financial and ESG practices affect European energy equipment and services industry companies. No causality was found between market capitalization and ESG performance. The authors conclude that the investment decisions of stakeholders are done based on the information provided by financial reports, the early phase of regulation regarding sustainability reporting. Thus, companies are advised to increase the quality and availability of CSR for investors.
5.2. The Role of Governance
[
82] placed their attention on the risk disclosure of companies in the energy sector. For that they used manual content analysis and regressions to explore the features of the board of directors and audit committee on risk disclosure in SR, concluding a positive effect of their size, and that of the independence of the board of directors. The authors used a sample of 65 international companies in the energy sector. In the same year, [
103] explored the determinants influencing the voluntary Italian public interest entities adoption of the Task Force on climate change disclosure using logistic regressions. Results point out that board size, ESG risks integration, and company size influence managers' decisions to adopt the guidelines. Also applying logistic regression models, [
104] analyzed the effects of sustainability reporting and gender diversity on ASEAN-listed companies between 2010 and 2019. They used seven key performance indices from the GRI standards, to indicate a positive impact of energy used, water management, work safety, and gender diversity, but a negative effect of carbon emissions and waste management on corporate performance. With a similar methodology, [
21] considered a random sample of 500 emerging Chinese enterprises to examine disparities in environmental, social, and governance reporting during 2018-2019. They adopted binary logistic regressions and Chi-square tests to find that international institutional ownership increases the disclosure of climate change. Also, independent non-executive directors are found to improve reporting quality and commitment to sustainable development goals, suggesting to Asian companies to increase independent directors and gender diversity. The presence of female directors is found to significantly influence disclosure emphasis on energy-saving initiatives.
Indeed, we may find already several different literature reviews surrounding the theme of SR and management team or board roles. [
105] explore quality science and management roles to solve CSR challenges. Results point out that CSR measurement frameworks are limited and not appropriate to measure the company’s ecological footprint. The main pointed problem is the lack of primary data for this assessment. They include CSR stakeholders, sustainability managers, company leadership, and boards in their literature review. [
106] examine the relationship between board governance mechanisms and sustainability reporting quality in Malaysia presenting a literature review and concluding for a positive effect of governance attributes. Even so, important empirical research ideas have also been presented in this regard. [
87] explore the relationship between green logistics performance and sustainability reporting using the corporate governance moderating role, with a sample from 177 countries between 2007 and 2016. Results suggest that ineffective boards of directors ensure a stronger link between logistics performance and sustainability reporting. Results should be validated for other industries, whereas other institutional factors and regulatory frameworks of nations should also be included. Country-level research should also be enhanced. [
107] study if the audit committee effectiveness influences reporting practices of GHG emissions of publicly listed Malaysian companies (43 companies GHG disclosures between 2016 and 2019). Regression results indicate that audit committee effectiveness is vital, leading to a better corporate disclosure practice. [
108] used a sample of Turkish companies from 2010-2019 to conclude that the presence of women on boards increases the likelihood of voluntary climate change disclosures. However, they do not find a positive relationship between climate change reporting and women’s board representation. The authors suggest board reforms, with an increased percentage of women on board committees to ensure greater management of sustainability risks and increased responses to stakeholders' demands in economic contexts where legislators continue finding irrelevant the introduction of climate change reforms.
As clearly stated previously, there is already a vast amount of research dealing with board or corporate governance members' characteristics and effects on SR, especially the effects of gender. For [
109], it will be critical to understand how gender is portrayed in sustainability communication when ESG is developing as a popular reporting framework for sustainability by capturing extra-financial disclosures. Through an examination of the visual imagery used to support sustainability claims, this article attempts to examine how gender is represented in these textual genres of a sample of Indian companies that are among the top Nifty 100 Enhanced ESG Index participants. Their qualitative research shows that despite increased exposure and evidence that they are rejecting gender norms, women nonetheless exhibit the tradition and modernity dilemma that feminist theorists have identified. In the author's conclusion, they demonstrate how the portrayal of women might be improved by adopting the principles of equality and inclusion: developing feminine strengths, preserving the good qualities of girls and women, emphasizing female bonding, and inclusiveness for all. They suggest practices and training to enable such a progressive mindset, which will eventually show in communication.
[
110] found an absolute imbalance in terms of gender diversity on the boards considering 25 Indian IT companies. Among the explored reasons the authors point 6 which was the most relevant, namely 1. Due to the difficulties and risks associated with this industry, women who have excelled in technological education are reluctant to accept leadership roles in IT businesses, 2. Due to health difficulties and family obligations, women are unable to devote the necessary time to managing corporate boards of IT companies. 3. Women's employment opportunities are constrained by joint families and the patriarchal Indian system, 4. Because men never want to be led by women in IT firms, women with liberal outlooks and merit are not considered candidates, 5. The upskilling programs offered by IT organizations to their female employees lack the necessary focus to advance women into leadership roles. 6. The excess share requirement for directorship set forth by listed public firms prevents women from being considered for executive roles. Thus, the country's culture exerts an interesting impact that should be considered in future empirical studies, both in comparative terms and individually.
[
111] purpose is to look at the important company traits that affect the adoption of sustainability reporting practices. A Logit model is used in the study, which is based on a sample of 366 significant Asian and African businesses that have addressed the SDGs in their sustainability reports that were released in 2017. According to the findings, large businesses in low- and middle-income nations that used SDGs tend to have traits including a greater market-to-book value (Tobin's q) and a larger use of external assurance for their reports. The findings also demonstrate a favorable correlation between the adoption of SDG reporting and the presence of female and younger directors in the company's management structure. In contrast to other studies, the use of sustainability reporting is not strongly influenced by the industry sector. To ensure that they are working in the best interests of the company and its stakeholders while growing their engagement in sustainability projects, the boards of directors of significant Asian and African corporations face problems, which are supported in this article. Similar conclusions have been reached by [
112] while using the same sample (Table 3). As well, [
21] emphasize the need for policymakers and practitioners in Asian nations to take into consideration raising the number of independent non-executive directors (INEDs) and gender diversity in emerging Chinese enterprises (ECEs). For the authors, ESG reporting should be improved, supporting the conclusions of earlier international research that suggested such governance methods. As opposed to [
111] results, [
113] findings evidence that companies in the chemical, pharmaceutical, and technology sectors are more likely to publish a sustainability report. These results imply that governance traits, business characteristics, and industry sectors can predict whether companies will provide standalone sustainability reports in a disclosure environment with little to no regulation, at least in Pakistan. Previously, [
114] stated that SDG reporting has an impact on performance in contentious businesses as well as environmentally delicate ones. Thus, addressing SDGs is a value-enhancing tool for businesses in contentious and environmentally sensitive industries in Europe. With the same sample, [
115] state that the adoption of SDG practices and external assurance of sustainability reporting is strengthened by an increase in the proportion of female directors on the Board of Directors. Furthermore, their research shows that businesses in environmentally sensitive and highly consumer-focused industries are more likely to implement SDG reporting and external assurance to boost their reputation and lessen public awareness of the overall environmental impact of their operations.
According to [
14], female CEOs who play a dual function have little influence over whether integrated reporting or stand-alone sustainability reporting is preferable. The study also demonstrates the lack of significance of females on boards with two or fewer members and gender board diversity (% of women over total board size). However, stand-alone sustainability reporting is considerably and favorably impacted when there are three or more female board members. Female independent directors are also more likely to favor stand-alone reporting over integrated reporting. Because female CEOs are more likely to implement stand-alone sustainability reporting, policymakers must encourage sensitive environmental enterprises to hire more female CEOs than male CEOs. Moreover, [
116]'s results, it is advised that women's presence on corporate boards of directors is one of the most important aspects of corporate governance since they may be more conscious of environmental issues and more concerned with lowering perceived risks.
According to [
117] companies' disclosure of sustainability reports is influenced by their low leverage, high-profile traits, and whether they have a growing variety of female directors. Occasionally, decisions made by women tend to be more socially conscious and will benefit stakeholders and sustainable practices more than those made by men. Consequently, it is anticipated that a higher proportion of women serving on boards of directors will be able to assist with the difficulties faced by senior management. The favorable impact of gender diversity on sustainability reports disclosure demonstrates that organizations can gain from gender diversity in terms of SDG reporting as well as corporate performance. As a result, it is assumed that the government can lessen inequity in the proportion of female directors on corporate boards. This is so because it has been shown that having more women on boards of directors increases commitment to sustainability policies, particularly in developing nations like Indonesia.
Companies that adhere to the Global Reporting Initiative's (GRI) sustainability reporting guidelines and whose sustainability performance disclosures (SPD) do so are more profitable [
118]. The result that gender diversity has no impact on GRI-based sustainability reporting in Uganda was explained by [
119] by the fact that there are more males (about 77%) employed in manufacturing firms as compared to 33% of females employed in such firms, justifying the lack of females positions on these boards as well. Besides, [
119] report that human resources with knowledge, experience, and skills in sustainability-related issues improve SPD. But also, the importance of a Sustainability Committee (SC) has been highlighted in the literature [
26]. [
26] study's findings are pertinent, by explaining how a SC plays a crucial role in shaping SDG disclosure and regulating its relationship with board gender diversity. The SC's creation encourages the dissemination of more information to stakeholders on the efforts companies are making to integrate the SDGs into their corporate agenda. The creation of an SC also provides women with the opportunity to strategically coordinate their efforts to encourage the board to better serve stakeholders' requirements through increased openness about SDG commitment. The study of [
120] demonstrates how Indonesian businesses frequently work to promote justice, peace, equality for women, and the attainment of excellent health. Companies disclose more CSR actions in line with the SDGs of decent health, quality education, access to clean water and sanitation, economic growth, and cooperation in their sustainability reports from 2017 to 2019. The findings of this analysis can be utilized to persuade businesses to pay more attention to SDG indicators that have not been met and work to implement CSR in a way that supports the SDGs and connects them to their daily operations.
[
121] findings suggest that the presence of women on the board of directors (BoD) positively impacts the extent of disclosure of social information, with a critical mass (the smallest number of women needed to affect the decision-making process about the extent of disclosure of social information) of 4 women or more (with an increase of 9.95%). The similarity between male and female board members, which can be explained by the functional training and sector experience being measured based on the similarity/homogeneity between them, made it so that the functional training and director's experience in the company's sector of activity were not significant. Additionally, the functional training and councilwomen's experience in the company's sector of activity based on critical mass was also not significant.
The stakeholder approach is supported by empirical studies, which show that companies are more likely to publish sustainability reports if their audit committees are bigger, their boards are made up of more women, and their institutional ownership is higher. The findings show that audit committee independence, foreign ownership, concentrated ownership, and management ownership have a negative impact on the decision of the corporations to report on sustainability. Overall, the influence of board composition on the choice of SR is marginal, but the influence of ownership structure and audit committee characteristics is considerable and inconsistent. The decision to voluntarily disclose is also influenced by the firm's age, size, financial capability, and growth potential [
113]. However, [
122], in the investigated mining businesses, declare that effective operations are considered as being fundamentally driven by compliance with regulations and permissions, as well as additional considerable pressure in the form of community acceptability, or the social license to operate.
Considering a different output, although associated with SR, [
123] findings prove that the choice to disclose carbon emissions is closely tied to the CSR report's assurance and release. Firms’ high-quality sustainability reports help to increase their credibility and influence stakeholders' perceptions of their company. Results also indicate that the presence of a CSR committee is significantly related to carbon disclosures, and they emphasize the significance of the CSR committee as the only driver for better environmental behavior (or carbon management) by significantly affecting the reduction of emissions. Reported findings in the literature also show that board independence and nationality play a key role in enhancing carbon disclosure [
124].
[
125] have selected the following from a list of probable determinants of required CSR disclosure in business annual reports: corporate ownership, financial performance, board size, corporate visibility, and gender diversity. Regression models have been used to evaluate the connections between independent variables and mandated CSR disclosure (environment, human resource, product, consumer, and community involvement). The empirical evidence from this study supports the notion that CSR disclosure is required in developing nations. This study backs up the assertion that businesses in emerging nations seem to favor giving. The findings of the study suggest that the stakeholder theory is the most pertinent one to explain the requirements for CSR disclosure. At the expense of shareholders, obligatory CSR disclosure modifies corporate behavior and creates positive externalities for society. [
125]'s data also indicate that the effect of research factors on the requirement for CSR disclosure is minimal. As a result, the requirement for CSR disclosure is significantly impacted by government ownership.
With a few exceptions [
126], deep diversity components at all organizational levels do not get much attention. [
126] findings show that having more women serve on organizational boards benefits the organization's overall gender diversity and other diversity-related factors. For boards of directors, corporate management, and regulators interested in enhancing corporate governance and diversity policies in New Zealand organizations, the outcomes of a focus on complete diversity have significant ramifications.
As may be shown, there is currently no established association in the literature between women serving on boards of directors and voluntary information disclosure, and there is conflicting empirical evidence. It is advised that the evidence in other publicly traded companies, as well as medium- and small-sized businesses, be investigated to generalize the findings. Most studies include publicly traded companies that are registered in specific financial markets and that voluntarily disclosed the sustainability report. It would be useful if in the future, with the ongoing mandatorily release of SR by companies a specific database gathering this data would become available.
It should be remembered that various CSR metrics or dimensions may be more important to some directors than others. Cultural and legal distinctions have not been specifically considered in previous studies, and therefore the findings should not be extrapolated to businesses with different legal and cultural traditions from the sample, as highlighted by [
121]. Additionally, [
113] findings for Pakistan point to the need for its authorities to rethink their approach and call for completely independent audit committees because of the unfavorable correlation between audit committee independence and sustainability reporting decisions. Thus, other BoD characteristics should be included in the analysis of the effectiveness of SR, and it can be as mediating role exerted into the relationship between gender and SR practices.
According to research, older and larger companies are more likely to publish sustainability reports (e.g., [
113]). Regulators ought to support small, medium-sized, and emerging businesses to adopt sustainable business practices. The empirical findings also show that companies in the chemical, pharmaceutical, and technology sectors are actively involved in sustainability reporting [
113], but others find no sector influence [
31,
111]. If in the [
113] study it appears that companies working in other industries are not under any pressure to provide sustainability information from stakeholders, the business sector can make use of these results to manage sustainability performance, respond to social and environmental hazards, and fulfill the expanding information needs of stakeholders. Comparing different sectors worldwide is still lacking research in the face of these conflicting results.
The results of some country-specific studies might not apply to other emerging, developing, and developed economies because they don't all have the same company structures, capital allocations, or investment climates. A comparable study should also be carried out in the finance industry to generate fresh insights. The use of qualitative research techniques could also aid in conducting a thorough assessment of the efficiency of corporate boards and audit committees in SR.
Regarding the geographical restriction, studies concentrating on other nations can add to the discussions of empirical studies presented in this article and can use previous research findings to compare and contrast their conclusions. When it comes to the usage of document analysis, the sustainability reports that are utilized are public information reports that businesses offer to stakeholders to demonstrate their advancements; as a result, it is required that they are as strong and comprehensive as feasible. However, we feel there is still lacking research exploring if sustainability reporting conforms to the imposed rules. Additionally, it is critical that stakeholders and investors regard this information as reliable and that businesses refrain from viewing this reporting with cynicism to guarantee the value relevance of SDG reporting. Investors, stakeholders, activist groups, and others cannot view SDG reporting as a symbolic gesture; it is only meant to resolve legitimacy concerns and comply with stakeholder pressure [
114]. Additionally, to boost firm transparency activities, the government should assist in providing guidelines that are still not being fully applied by businesses. It might also show appreciation to those businesses that have backed the Sustainable Development Goals [
120].
In some of these countries, individual knowledge might appropriately be generalized for other developing or developed countries that have a similar economic structure. Still, a lack of geographical comparison is identified, both empirically and theoretically. Also, some of these articles do not relate financial theories to the empirical studies developed, and a complete overview of the conformation of each of these authors' results to the existing theories is still needed to be developed. Moreover, sometimes, data from businesses in one or three industries served as the basis for research findings on mandated or voluntary CSR and SR disclosure elements. Therefore, generalizing the results statistically could be deceptive. Also, a document-based source of data is usually preferred because the research aimed to compare the data across firms at the same time. Other media, such as company websites and social networking marketing, are used by businesses to publicize their CSR initiatives, whose examination is still lacking research.
Some of the identified authors' results cannot be generalized because it only includes data from one year of disclosure. Thus, extensive-time databases are needed to analyze the evolution through time. As far as possible, we recommend that future studies again try to update the results presented thus far with at least a cover period of 3 recent years, but preferably with a data span of more than 10 years for us to be able to analyze the evolution through time, as well, of SR and its relationship with gender diversity. Additionally, future studies employing various methodological techniques, such as interviews to specify BoD's thoughts on the firm's features and the level of mandated CSR disclosure, could consider external stakeholders' perceptions, corporate governance, and leverage. In this vein, [
126] were the first to contend that there is a synergistic relationship between gender diversity goals and deep diversity goals (race, age, sexual orientation, disability, and ethnicity) and that neither gender diversity goals nor deep diversity goals can be met without the other. This study does a content analysis of the diversity-related disclosures made by 152 NZX-listed businesses using a 30-item diversity disclosures index. The authors found that when examining diversity-related disclosures in annual and sustainability reports, NZX-listed businesses mostly only discuss board gender diversity. Thus, more studies including other factors besides gender diversity should emerge.
To improve the generalizability of [
124]'s board diversity findings, future studies might consider bigger samples. Second, [
124]'s study developed a board diversity index using the Australian Board Diversity Index methodology. Other aspects of variety, like ethnicity, may be studied by academics. Using a variety of theoretical frameworks that include five dimensions—board nationality, gender, independence, tenure, and age—within enterprises with variable decarbonization performance and industry carbon impact, analyze the relationship between carbon disclosure and board diversity. Future research may also look at how addressing SDGs in sustainability reports affects alternative market outcomes like capital costs, company reputation, stakeholders' views of legitimacy, and other things outside performance [
114].
In the already existent empirical literature, some control variables may have been left out, and due to that the proposed regression models might have certain flaws. Empirical studies on the subject should include more controls as those accounting for business size, leverage, risk, R&D intensity, physical and final resources, and ownership concentration when estimating regressions. Moreover, macroeconomic, and cultural contexts [
117] can also exert influence. Although European nations are innovators and leaders in addressing sustainability strategies, these are still underexplored. Thus, we advise that future research broaden the evidence presented to other regions, looking at, for instance, other continents or regions, as well as the impact of the institutional context (examples include transparency, corruption, and a country's orientation to socially responsible issues, among others).
Finally, the empirical results presented in most of the studied documents cannot be generalized to small and medium-sized organizations (SMEs) because the samples are usually made up of the largest global listed corporations. Future research on this relationship in the context of SMEs would be interesting. Additionally, the context of family firms with their specific characteristics could be explored since from Table 3 we observe that only one study up to this moment has explored this enterprise context of family-owned firms [
127], where usually women have more difficulties to stand out in managing roles.