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1 INTRODUCTION
The hotel industry is important to the world economy as it contributes to economic and social development. However, to develop their activities, processes and services the hotels generate environmental impacts that may contribute to global warming and the depletion of natural resources.
The awareness and social pressure led the hotels to start managing the environmental impacts of their activities and to become accountable to society for this management. In this sense Oliveira et al. (2016) warn that the interest of society in sustainability becomes a decisive factor for selecting a given tourism enterprise, representing also a guarantee of comfort and hospitality.
According to Buosi et al. (2014) the relational view of sustainable development of the place and the perceived image by tourists brings an interesting perspective to the strategic planning of marketing actions aiming at the success of the tourism destination, enabling the performance improvement of the enterprises.
The importance of the subject and its multidisciplinary scope prompted the motivation of the authors of this study to broaden their understanding of the topic, making the following research question: "How to conduct a mapping of Sustainability Environmental Management in Hotels, within the framework defined by the researchers?"
Thus, it was established as a general objective of this work to conduct a mapping on the topic Sustainability Management in Hotels, according to the framework set forth by the researchers.
To achieve the above-mentioned objective, we adopted the Knowledge Development Process - Constructivist (ProKnow-C) proposed by Ensslin et al. (2010) as an instrument of intervention.
In addition to this introduction, this paper features four more sections. In section two, we present a review of literature on environmental sustainability in hotels. Section three, in addition to the methodological framework, presents the assumptions of the research, as well as the instrument of intervention. Section four presents the results of the survey, and, finally, in section five we present the conclusions of the work.
2 THEORETICAL FRAMEWORK
This section presents some issues related to the theme in order to a better understanding of it and to search the international theoretical framework.
The theme of environmental sustainability management in hotels has been developing aiming to contribute to the debate on the environmental problems of the global ecosystem experienced over the last few decades.
Within the hotel industry, according to Erdogan and Baris (2007) the hotels are a key element of the organized chain of activity in the hospitality industry, and are central to the concerns on the environmental protection related to travel and tourism.
Lunkes and Rosa's (2012) study points out that for hotel companies to promote sustainable development, it is necessary to have structures to meet the demands of the guests (facilities and services quality), efficient economic performance (environmental revenues, cost savings), and at the same time develop responsible environmental practices (measures to increase the energy efficiency of facilities, reduce water consumption , reduce greenhouse gas emissions, wastewater and residues, i.e., to develop actions to solve or minimize environmental problems).
In this context, the environmental management of the hotel is composed of a set of policies, programs, and management and operational practices that will entail the understanding of factors, such as: (i) the environment is an exhaustible resource; (ii) the managers have professional responsibilities; (iii) the hotels need to respond to social demands; (iv) the existence of international standards; (vi) the need to be in legal compliance; among others.
According to Erdogan and Baris (2017) in the hotel industry worldwide the key forces are: Government regulations, consumer demands, professional ethics, and the initiatives of professional associations, international organizations, and non-governmental organizations.
Besides this, Chan and Hawkins (2010) indicate that the motivation of employees also contributes to the implementation of an environmental management system, emphasizing the importance of employees for the efficiency of environmental sustainability in hotels.
Therefore, in accordance to Lunkes and Rosa (2012) the main purpose of environmental planning and control is to provide normal hotel operations. As a reflex of the a priori control, the hotel can meet the demands, respond to legal requirements and achieve its strategic objectives.
The authors Lunkes and Rosa (2012) complement this discussion showing that the stakeholders' interests can be different and sometimes conflicting, the management systems must be planned from these diversities, as presented in Table 1.
Table 1 Stakeholders' interest on the environmental information provided by hotels
| Stakeholders | Interests in the environmental information |
|---|---|
| Suppliers and Customers | Environmental efficiency of the services provided (use of water and energy, wastewater, emissions and waste management, existence of material recycling programs, among others), Furthermore the hotel should note that customers and suppliers have other objectives that may be greater than the concerns with the environment, such as: price, quality and functionality of the services. |
| Employees and Unions | Environmental policies; on-job qualification and environmental trainning. |
| Funders and Investors | Economic and financial results obtained with an increase in environmental efficiency (such as: new revenues, cost reduction, reduction of liabilities from fines and penalties); monitoring and environmental responsibilities management; enhancement of the image of the hotel, correlation between financial and environmental performances. |
| Civil society | Environmental aspects and impacts; social interferences; sustainable development. |
| Government | Legal compliance of environmental responsibility; taxes; incentives. |
| Top Management | Strategic objectives; influence of environmental performance on economic and financial performances; legal requirements; legitimacy. |
Source: Lunkes and Rosa (2012, p. 233 )
In addition to meeting stakeholders' demands, the hotel should follow the environmental standards, and meet their strategic objectives. Therefore, in this research the management of environmental sustainability is considered a complex activity that requires planning and control, efficient information, and indicators. Based on this understanding, we seek the theoretical framework elements to understand how the scientific literature has treated aspects related to the Environmental Sustainability theme.
3 METHODOLOGY
This research is exploratory and descriptive in nature, and it aims to identify in the literature the aspects related to the topic and to describe the profile of the publications. Following we present the methodological procedures, the assumptions and the research instrument.
For a better understanding of the procedures adopted we used the instrument of intervention Knowledge Development Process - Constructivist (Proknow-C), since this method specifies the stages of the research.
The Proknow-C has its origin in 2009, in the Multicriteria Decision Aid Laboratory (LABMCDA) of the Department of Production Engineering at the Federal University of Santa Catarina, consolidating from 2010, when the first publications in the current format appeared. The ProKnow-C is composed of four macro-steps. The first step, the review stage, consists of entering a portfolio of articles to be reviewed in a structured and justified way, then we proceed to step two: Bibliometrics; step three: Systemic Analysis; and step four: Research Question.
In the current study, we searched the database Web of Science from 1996 to 2016 for collection of items, and using the keywords: "sustainability"; "hotel".
In order to meet the objective of this research, i.e. to conduct a mapping of the theme of sustainability management in hotels we began with the first step of ProKnow-C. The process of selection of the Bibliographic Portfolio (BP) in the ProKnow-C is briefly exposed in Figure 1.
Source: Chaves et al. (2012, p. 9)
Figure 1 Selection Process of the Articles of the Bibliographic Portfolio (BP)
After the process set out in Figure 1, the researcher has a set of scientific material that represents the subject, according to their own criteria.
The beginning of the process shown in Figure 1 started with the identification of 214 articles, and following the whole process in which are taken into account mainly the relevance of the articles and authors, and adherence to the theme, a bibliographic portfolio of 36 articles was obtained: McElroy and Albuquerque (1998); Becken et al. (2001); Alho et al. (2002); Mbaiwa (2003); Grangsjo (2005); Trung (2005); Kumar (2005); Erdogan and Baris (2007); Schanetz et al (2007); Ferreira et al. (2007); Mak (2008); Lei and Wang (2008); Bohdanowic and Zientar (2008); Chan; Hawkins (2010); Darcy (2010); Tortella and Tirado (2011); Filimonau et al. (2011); Chan (2011); Grosbois (2012); Antón et al. (2012); Hsieh (2012); Zhang et al. (2012); Chan et al. (2014); Pérez and Bosque (2014); Barber and Deale (2014); Kim and Kim (2014); Zhang et al. (2014); Susskind (2014); Signes et al. (2014); Kasim et al. (2014); Michailidou et al. (2015); Kang et al. (2015); Pieri et al. (2015); Chen (2015); Stylos and Vassiliadis (2015); Styles et al. (2015); Michailidou et al. (2016), according to Table 2.
Table 2 Research Bibliographic Portfolio
| Title | Author(s) | Journal | Year of Publication |
| Tourism penetration index in small Caribbean Islands | McElroy and Albuquerque | Annals of Tourism Research | 1998 |
| Energy consumption patterns in the accommodation sector-the New Zealand case | Becken et al. | Ecological Economics | 2001 |
| Degree of threat to the biological diversity in the Ilha Grande state park (rj) and guidelines for conservation | Alho et al. | Braz. J. Biol. | 2002 |
| The socio-economic and environmental impacts of tourism development on the Okavango Delta, north-western Botswana | Mbaiwa | Journal of Arid Environments | 2003 |
| Hotel networks and social capital in destination marketing | Grangsjo | IJSIM | 2005 |
| Resource use and waste management in Vietnam hotel industry | Trung and Kumar | Journal of Cleaner Production | 2005 |
| Environmental protection programs and conservation practices of hotels in Ankara, Turkey | Erdogan and Baris | Tourism Management | 2007 |
| Aquifer development planning to supply a seaside resort: a case study in Goa, India | Ferreira et al. | Hydrogeology Journal | 2007 |
| The learning tourism destination: the potential of a learning organisation approach for improving the sustainability of tourism destinations | Schanetz et al. | Tourism Management | 2007 |
| Corporate Social Responsibility in Hospitality: Issues and Implications. A Case Study of Scandic | Bohdanowic and Zientar | Scandinavian Journal of Hospitality and Tourism | 2008 |
| Energy synthesis of tourism-based urban ecosystem | Lei and Wang | Journal of Environmental Management | 2008 |
| The future of the State-owned hotels in China: Stay or go? | Mak | International Journal of Hospitality Management | 2008 |
| Attitude towards EMSs in an international hotel: an exploratory case study | Chan and Hawkins | International Journal of Hospitality Management | 2010 |
| Inherent complexity: Disability, accessible tourism and accommodation information preferences. | Darcy | Tourism Management | 2010 |
| Implementing environmental management systems in small- and medium-sized hotels: obstacles | Chan | Journal of Hospitality & Tourism Research | 2011 |
| Reviewing the carbon footprint analysis of hotels: Life Cycle Energy Analysis (LCEA) as a holistic method for carbon impact appraisal of tourist accommodation | Filimonau et al. | Journal of Cleaner Production | 2011 |
| Hotel water consumption at a seasonal mass tourist destination. The case of the island of Mallorca B36 | Tortella and Tirado | Journal of Environmental Management | 2011 |
| Use of different sustainability management systems in the hospitality industry. The case of Spanish hotel | Antón et al. | Journal of Cleaner Production | 2012 |
| Corporate Social responsibility reporting by the global hotel industry: Commitment, initiatives and performance | Grosbois | International Journal of Hospitality Management | 2012 |
| Hotel companies' environmental policies and practices: a content analysis of their web pages | Hsieh | International Journal of Contemporary Hospitality Management | 2012 |
| Exploring Resource Efficiency Benchmarks for Environmental Sustainability in Hotels | Zhang et al. | Cornell Hospitality Quarterly | 2012 |
| Tapping Mindfulness to Shape Hotel Guests' Sustainable Behavior | Barber and Deale | Cornell Hospitality Quarterly | 2014 |
| What drives employees' intentions to implement green practices in hotels? The role of knowledge, awareness, concern and ecological behaviour | Chan et al. | International Journal of Hospitality Management | 2014 |
| The importance of water management in hotels: a framework for sustainability through innovation | Kasim et al. | Journal of Sustainable Tourism | 2014 |
| The Effects of Message Framing and Source Credibility on Green Messages in Hotels | Kim and Kim | Cornell Hospitality Quarterly | 2014 |
| Sustainable development and stakeholder relations management: exploring sustainability reporting in the hospitality industry from a SD-SRM approach | Pérez and Bosque | International Journal of Hospitality Management | 2014 |
| The Impact of Environmental Certification on Hotel Guest Ratings | Signes et al. | Cornell Hospitality Quarterly | 2014 |
| Guests' Reactions to In-Room Sustainability Initiatives: An Experimental Look at Product Performance and Guest Satisfaction | Susskind | Cornell Hospitality Quarterly | 2014 |
| Eco-efficiency of Service Co-production: Connecting Eco-certifications and Resource Efficiency in U.S. Hotels | Zhang et al. | Cornell Hospitality Quarterly | 2014 |
| From sustainability to customer loyalty: A case of full service hotels' guests | Chen | Journal of Retailing and Consumer Services | 2015 |
| Corporate Social responsibility and sustainability balanced scorecard: The case study of family-owned hotels | Kang et al. | International Journal of Hospitality Management | 2015 |
| A methodology to assess the overall environmental pressure attributed to tourism areas: A combined approach for typical all-sized hotels in Chalkidiki, Greece | Michailidou et al. | Ecological Indicators | 2015 |
| Identifying energy consumption patterns in the Attica hotel sector using cluster analysis techniques with the aim of reducing hotels´ CO2 footprint | Pieri et al. | Energy and Buildings | 2015 |
| Water management in the European hospitality sector: Best practice, performance benchmarks and improvement potential | Styles et al. | Tourism Management | 2015 |
| Differences in Sustainable Management Between Four- and Five-star Hotels Regarding the Perceptions of Three-Pillar Sustainability | Stylos and Vassiliadis | Journal of Hospitality Marketing e Management | 2015 |
| Life Cycle Thinking used for assessing the environmental impacts of tourism activity for a Greek tourism destination | Michailidou et al. | Journal of Cleaner Production | 2016 |
Source: Research data
For the classification of the Bibliometric analysis the following elements were taken into consideration: period, journals, authors and featured articles. For the analysis of the objectives and the results the articles were sorted by researched subject. For the analysis of the indicators it was verified in the content analysis the criteria used to put up methods and evaluation methodologies. Finally, to identify the research methodologies used, the classification of Birnberg et al. (1990) and Hesford et al. (2007) was adopted as depicted in Table 3.
Table 3 Classification of the research methodologies
| Métodos de pesquisa | Definição |
|---|---|
| Analítica | Envolve o estudo e avaliação aprofundados de informações disponíveis na tentativa de explicar o contexto de um fenômeno. |
| Arquivo/documental | Envolve a utilização de informações que ainda não tiveram um tratamento cientifico. |
| Caso | Envolve a investigação de fenômenos, inclusive pessoas, procedimentos e estruturas em uma única organização. |
| Experimental | Envolve a manipulação e tratamentos na tentativa de estabelecer relações de causa-efeito nas variáveis investigadas. |
| Campo | Envolve a investigação de fenômenos, inclusive pessoas, procedimentos e estruturas em duas ou mais organizações. |
| Framework | Envolve o desenvolvimento de um novo conceito, de novas perspectivas. |
| Revisão | Enolve basicamente síntese e revisão de literatura já conhecida. |
| Levantamento | Envolve a investigação de um grupo de pessoas, geralmente realizado via a aplicação de questionário. |
| Outros | Não se enquadra em nenhum dos outros métodos |
Source: Adapted Birnberg et al. (1990); Hesford et al. (2007); Lunkes et al. (2012)
Based on the above-mentioned propositions we present next the results of the analysis of 36 articles which compose the bibliographic portfolio of this research.
3 ANALYSIS OF THE RESULTS
The analysis of the results is performed on five topics, with the aim of analyzing the theoretical and methodological contributions of the articles of the BP. The following five aspects of each of the 36 articles were examined: (a) Bibliometric analysis, (b) desired objectives and results achieved (c) research methodologies, (d) environmental indicators pointed to by the literature reviewed as relevant to the management of environmental sustainability in hotels.
3.1 Bibliometric analysis
Within the concept of a BP the next step of Proknow-C process is Bibliometrics, which can be understood as a process to depict the quantitative data relating to a Bibliographic Portfolio aiming to manage information (Ensslin et al., 2010a). In this sense, the Proknow-C is intended to perform a Bibliometric analysis on: period, journals, authors and featured articles. According to Figure 2 we verify that the publication of the articles on environmental management in hotels are concentrated in 2014 and 2015.
Regarding the analyzed journals the following stood out: Cornell Hospitality Quarterly and International Journal of Hospitality Management, Journal Cleaner Production and Tourism Management, as presented in Figure 3.
The continuation of the bibliometric analysis reveals that one of the authors, Eric S. W. Chan stands out with 3 articles in the bibliographic portfolio, as presented in Figure 4.
Finally, looking at the amount of citations, the articles "The socio-economic and environmental impacts of tourism development on the Okavango Delta, north-western Botswana" authored by Mbaiwa and "Energy consumption patterns in the accommodation sector - the New Zealand case" authored by Susanne Becken, Chris Frampton and David Simmons clearly stand out, with 253 and 187 citations, respectively.
The bibliometric analysis is just a short account of the quantitative aspects that stand out in the analyzed sample, however, the scientific merit goes beyond the number of citations, insertion of authors, and journals, therefore, the theoretical and methodological aspects that contribute to the topic searched are also analyzed.
Analysis of the desired goals and achieved results
Initially, we identified the central themes related to the objectives of the proposals made in articles that make up the Bibliographic Portfolio presented in Figure 5.
According to the Figure 5 the topics which stand out are: Environmental Management (12), Sustainability (7), Performance evaluation (5), and Environmental disclosure (4).
The topic "Environmental Management" was addressed by the authors of the articles analyzed in order to observe and propose improvements to the environmental management practices (total or partial) of hotels in different parts of the world. Trung and Kumar (2005) analyzed the environmental management aiming to assess the use of resources in the hotel industry of Viet Nam. Tortella and Mak (2008) examined the critical issues that cause these problems faced by hotels; the factors that affect the development of hotels, and issues related to property, structure, and bureaucratic control. Tirado (2011) developed a model to analyze water consumption. Chan (2011) identified the barriers to the adoption and implementation of a formal environmental management system. Antón et al. (2012) acknowledged the existence of management systems in the hotel industry in Spain. Hsieh (2012) has examined the environmental management policies and practices of major companies of 50 hotels as disclosed in their corporate websites. Barber and Deale (2014) analyzed the interaction of clients with sustainability practices in hotels. Chen (2015) examined how the technologies, innovations and sustainable effort factors have an impact on customers' perceptions, decisions, experience, and post-experience. Stylos and Vassiliadis (2015) looked at the perceptions and practices of environmental management. And Styles et al. (2015) presented a summary of best practices, key performance indicators and performance benchmarks for water management in hotels.
The topic "Environmental sustainability" is used in literature to deal with issues related to the interaction between hospitality industry and environment. With this perception Bohdanowicz and Zientar (2008) found that social responsibility in the context of the hospitality industry, has had implications for human resources management, for the support of the local community, and the promotion of environmental sustainability in the surroundings of the hotels. Mbaiwa (2003) identified the environmental impact of the hotel industry of the town of Okavango Delta. Alho et al. (2002) identified the dominant landscape units (natural habitats) of the State Park of Ilha Grande and applied threat analysis in order to interpret and to propose guidelines for the conservation of the local biodiversity through the sustainable use of tourism potential. Erdogan and Baris (2007) analyzed the empirical aspects related to environmental protection, waste management, purchasing, energy use, and practices of hotels in Ankara, Turkey. Schanetz et al. (2007) argued, based on a review of six case studies, the potential of environmental sustainability of hotels. Ferreira et al. (2007) examined the methods of analysis of water resources of the coastal zone of Bardez in Goa, India. And, finally, Kasim et al. (2014) analyzed how tourism in general, and specifically hotels, may have contributed to the crisis in the quality and quantity of water resources.
The "Performance evaluation" has been used to assess by means of indicators and methodologies the environmental performance of companies in the tourism sector. Thus, McElroy and Albuquerque (1998) built an index of tourism to identify spending per capita/visitor, daily visitor density per 1,000 resident population, and the number of hotel rooms per square kilometer. Lei and Wang (2008) examined the flow of emergy to investigate and characterize the urban evolution and city development that have occurred in Macao from 1983 to 2003. Filimonau et al. (2011) discussed the potential of the Life Cycle Assessment for the environmental assessment of tourism accommodation facilities, and its contribution to the global carbon footprint. Pieri et al. (2015) presented the results of an energy audit that was conducted on a sample of 35 hotels focusing on their energy and environmental performance. Michailidou et al. (2016) identified the environmental load in areas of tourism activities by means of Life Cycle Assessment (LCA).
On its part, the "Environmental disclosure" is a topic used to assess the legitimacy of the dissemination of environmental information provided by companies in the sector of tourism and hospitality. Thus, Grosbois (2012) assessed the practice of corporate communications held (on websites and published reports) by the largest hotel companies in the world. Pérez and Bosque (2014) explored the sustainability reports of 170 hotels to identify sustainability practices in the hotel industry. Kim and Kim (2014) used an experimental approach to analyze the influence of source credibility and message framing on the attitudes of potential hotel clients, behavioral intentions in relation to messages about environmental protection. Kang et al. (2015) analyzed the benefits of Corporate Social Responsibility (CSR) to family-owned hotels.
The terms "Economy and politics" are used by Grangsjo (2005) to identify economic and political-institutional aspects that interfere in environmental sustainability of hotels. Darcy (2010) in turn, takes into account external aspects such as economy, politics, and planning to study sustainability in hotel activity. And finally, Michailidou et al. (2015) promote a methodological scheme to combine the main environmental pressures that can be attributed to tourism activity, in order to characterize the environmental sustainability, and the study is conducted in 511 hotels in Greece.
The analysis of "Efficiency" is used by Becken et al. (2001) to analyze energy consumption within New Zealand accommodation sector. The main objective is to verify the differences in energy consumption according to the different hotel classifications and business sizes. Zhang et al. (2012) constructed a cost-based resource efficiency measure for environmental sustainability from reported financial data. This approach links the environmental and economic performance outcomes, extracting information from expenses related with resources normalized by RevPAR (revenue per available room ). And, finally, Susskind (2014) studied the effects of equipment replacement on the reduction of energy consumption.
Finally, "Certification" issues are used to verify how the certification helps with efficiency and environmental management in the hotel industry. In this way, Zhang et al. (2014) explored the relationship between eco-certifications and resource efficiency in the hotel industry of the United States, examining hotels which have become eco-certified. Signes et al. (2014) analyse the impact on hotels of the environmental certification system ISO 14001 from the customers' perspective. The study was based on a comparison of ratings of customers of 6,850 hotels in Spain, with and without ISO 14001 certification.
The results analyzed from over 20 years demonstrate that the subject of environmental sustainability in hotels is relevant, and it is directly related to the global concerns with the survival of the planet itself.
The studies were developed in different countries, such as: United States, China, Brazil, Spain, New Zealand, Greece, Botswana, India, among others.
In addition, studies seem to corroborate each other's findings that the factors such as: size, classification of hotels, focus (Beach, business, field, etc.), governance, standards, and types of customers, can influence managerial decisions and environmental sustainability.
It was also verified that over time aspects such as: operational, legal, political, institutional, organizational learning, and stakeholders, have broadened the debate on sustainability in the hotel sector, also they have been incorporated in the systems of environmental management of hotels, thus improving the environmental performance management systems, employee training, and customer service.
Furthermore, some studies point out certifications as an ally to environmental sustainability and a way of legitimizing hotel activities with their customers.
Thus, the studies have contributed to the improvement of environmental management of hospitality, especially hotels, regarding aspects of sustainability of the tourism and hotel sector with note to the environmental and social impact of the activity, for customer management, employee training, operational efficiency and definitions of public policy, and economic analysis.
In this way, the studies show that the environmental sustainability theme is relevant and current, which can be observed both in the organizational scope and within the political and economic context. In this sense, academia has been exploring the various topics related to the environment and society within the hotel context, in order to observe economic, social, and environmental impacts of the activity, as well as to contribute to a matter of global concern: the environment.
After the identification of objectives and results, we sought to identify and describe the methodologies used, the main findings and research contributions to the topic of environmental sustainability in hotels.
3.2 Research Methodologies
To examine how the methodologies adopted by the researchers contributed to the research topic we present Figure 6.
As shown in Table 6, the Analytical methodology is predominant, and it is possible to notice that this methodology was used in articles which explored topics related to performance evaluation (5 articles), environmental management (3 articles), sustainability (2 articles), environmental disclosure (2 articles), certifications (1 article), economy and politics (1 article) and efficiency (1 article). Demonstrating the relevance of empirical studies for in-depth evaluation of the available information, in an attempt to explain the environmental sustainability in the hotel industry within the organizational and the economic and political contexts.
The surveys come next, with the application of questionnaires to customers, employees, and society to investigate issues related to environmental management (5 articles), economy and politics (2 articles), environmental disclosure (article 1) and certifications (1 article).
The six (6) articles which developed framework methodology explored concepts and methods related to sustainability and environmental management aimed at theoretical and methodological innovation.
Two articles used experimental methodology, handling and treating data in order to establish cause and effect in the variables investigated about efficiency and environmental disclosure. Susskind (2014) sought to study efficiency by analyzing the effects of equipment replacement on the reduction of energy consumption. Kim and Kim (2014) used an experimental approach to analyze the influence of source credibility and message framing on the attitudes of potential clients, behavioral intentions in relation to messages about environmental protection.
Antón et al. (2012) conducted a study using Documentary/ archival methodologies on environmental management to analyze the existence of management systems in the hotel industry in Spain. Chan (2011) developed a case study on environmental management to identify the barriers to the adoption and implementation of a formal environmental management system, for a hotel in Hong Kong. Alho et al. (2002) developed a field study on sustainability whose main objective was to identify the dominant landscape units (natural habitats) of the State Park of Ilha Grande and applying a threat analysis, in order to interpret and propose guidelines for the conservation of local biodiversity through the sustainable use of high tourism potential. Finally, Schanetz et al. (2007) conducted a review of sustainability to present the concept of Learning Tourism Destinations (LTD) and discuss, based on a review of six case studies, the potential of the environmental sustainability of hotels as a tool for the implementation and improvement of collective learning processes.
3.3 Used indicators
The studies also reveal indicators required to compose models or tools for assessing the environmental sustainability of hotels, see Table 4.
Table 4 Indicators of environmental sustainability
| Indicators/ Authors | McElroy; Albuquerque (1998) | Becken et al. (2001) | Alho et al. (2002) | Mbaiwa (2003) | Grangsjo (2005) | Trung; Kumar (2005) | Erdogan; Baris (2007) | Schanetz et al. (2007) | Ferreira et al. (2007) | Mak (2008) | Lei; Wang (2008) | Bohdanowicz; Zientar (2008) | Chan; Hawkins (2010) | Darcy (2010) | Tortella; Tirado (2011) | Filimonau et al. (2011) | Chan (2011) | Grosbois (2012) | Antón et al. (2012) | Hsieh (2012) | Zhang e al. (2012) | Chan et al. (2014) | Pérez; Bosque (2014) | Barber; Deale (2014) | Kasim et al. (2014) | Kim; Kim (2014) | Zhang et al. (2014) | Susskind (2014) | Signes et al. (2014) | Chen (2015) | Kang et al. (2015) | Michailidou et al. (2015) | Pieri et al. (2015) | Stylos; Vassiliadis (2015) | Styles et al. (2015) | Michailidou et al. (2016) | Total |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Internal Strategic Management | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 11 | |||||||||||||||||||||||||
| Organizational learning | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 7 | |||||||||||||||||||||||||||||
| Water | 1 | 1 | 1 | 1 | 1 | 1 | 6 | ||||||||||||||||||||||||||||||
| Energy | 1 | 1 | 1 | 1 | 1 | 1 | 6 | ||||||||||||||||||||||||||||||
| External aspects (economy, politics and planning) | 1 | 1 | 1 | 1 | 1 | 1 | 6 | ||||||||||||||||||||||||||||||
| Waste (plastics, glass, batteries, ink cartridges) | 1 | 1 | 1 | 3 | |||||||||||||||||||||||||||||||||
| Food waste | 1 | 1 | 1 | 3 | |||||||||||||||||||||||||||||||||
| Certification | 1 | 1 | 1 | 3 | |||||||||||||||||||||||||||||||||
| Environmental politics | 1 | 1 | 1 | 3 | |||||||||||||||||||||||||||||||||
| Emissions | 1 | 1 | 2 | ||||||||||||||||||||||||||||||||||
| Protected áreas | 1 | 1 | 2 | ||||||||||||||||||||||||||||||||||
| Noise | 1 | 1 | |||||||||||||||||||||||||||||||||||
| Total | 53 |
Source: Research data
As shown in Table 4, the studies indicate that for assessing the environmental sustainability of hotels the following elements are important: aspects related to the consumption of natural resources such as water and energy; the impacts generated in the hotel sector activities, such as noise, emissions, waste and impact in the areas of preservation; the interests of the different stakeholders; the influence of the Government and specific policies in support of sustainability; as well as aspects of management and strategy.
4 CONCLUSION
In face of the decision-making process, its multidisciplinary nature and importance of the theme of environmental management in hotels, the research question has arisen: "How to conduct a mapping of Sustainability Environmental Management in Hotels, within the framework defined by the researchers?" which established the general objective of this work.
In this way, to perform the mapping of the environmental sustainability theme, a Bibliographic Portfolio (PB) was identified, according to the delimitations made by researchers, the keywords ("Sustainability" and "hotel") were used as filters on titles, abstracts and full articles. Later, the following aspects were surveyed: aim, results achieved, and environmental indicators highlighted as relevant to environmental sustainability.
Besides the importance for the decision-making process management and its presence in different areas of knowledge, this research contributes to the development of a Bibliographic Portfolio concerning the theme of the environmental sustainability in hotels, enabling the generation of knowledge on related variables and concepts that guide environmental management in this type of environment.
This study carried out a survey on the available portals of Web of Science database from 1996 to 2016, and it is recommended, also, for future research an analysis of information about the BP, based on a theoretical affiliation.
The research revealed that the topic has gained importance recently, specifically in 2014 and 2015, the prominent journals are Cornell Hospitality Quarterly and International Journal of Hospitality Management, Journal Cleaner Production and Tourism Management. The author Eric S. W. Chan stands out with 3 articles on the analyzed bibliographic portfolio.
The articles that stand out are: " The socio-economic and environmental impacts of tourism development on the Okavango Delta, north-western Botswana " authored by Mbaiwa with 253 citations; and " Energy consumption patterns in the accommodation sector - the New Zealand case " authored by Susanne Becken, Chris Frampton and David Simmons with 187 citations.
The results of the analysis of the articles of the BP demonstrate that the most recurrent themes are: Environmental management (12), Sustainability (7), Performance evaluation (5), and Environmental disclosure (4).
The theme "Environmental management" was addressed by the authors of the articles analyzed in order to observe and propose improvements to environmental management practices (total or partial) in hotels of different parts of the world. "Environmental sustainability" is used in literature to deal with issues related to the interaction of the hospitality industry with the environment. "Performance evaluation" has been used to assess by means of indicators and methodologies the environmental performance of companies in the tourism sector. "Environmental disclosure" is a topic that assesses the legitimacy of the dissemination of environmental information provided by companies in the sector of tourism and hotel industry. "Economy and politics" is used to identify economic and political-institutional aspects that influence the environmental sustainability. "Efficiency" is a topic that analyzes how the use and consumption of energy and resources, and the replacement of equipment assist in environmental efficiency. "Certifications" are analyzed to verify managers and customers' perception and about their impacts on environmental management of hotels.
Therefore, it is concluded that the subject of environmental sustainability in hotels is relevant, and it is directly related to the global concerns with the survival of the planet itself. The themes and methods presented in the 36 articles analyzed have contributed to the environmental management of the hotel industry, the sustainability of the tourism and hospitality sector and can even assist in the definition of public policy and economic analysis.
The studies also show that the environmental sustainability theme is relevant and current. Environmental sustainability, therefore, can be observed within the organizational scope and in the political and economic context. In this sense the academia has been exploring various topics related to the environment and society within the hotel context, in order to observe economic, social and environmental impacts of the activity, as well as to contribute to a matter of global concern: the environment.
For future research, the paper recommends that further empirical research is carried out, based on a worldview in which the criteria for environmental sustainability management in hotels is presented, as well as the observation of how managers take their decisions on the criteria or elements needed to provide sustainability of the hotel sector.
