The key direction of political actions in the field of sustainable development of the energy sector and economy is the process of energy transformation (decarbonization) and increasing the share of renewable energy sources (RES) in the supply of primary energy. Regardless of the indisputable advantages, RES are referred to as unstable energy sources. A possible solution might be the development of the concept of hydrogen supply chains, especially the so-called green hydrogen obtained in the process of electrolysis from electricity produced from RES. The aim of the research undertaken in the article is to identify the scope of research carried out in the area of hydrogen supply chains and to link this research with the issues of the operation of electricity distribution networks powered by RES. As a result of the scoping review, and the application of the text-mining method using the IRaMuTeQ tool, which includes the analysis of the content of 12 review articles presenting the current research achievements in this field over the last three years (2016–2020), it was established that the issues related to hydrogen supply chains, including green hydrogen, are still not significantly associated with the problem of the operation of power grids. The results of the conducted research allow formulating recommendations for further research areas.

One of the trends in consumer behaviour that has been gradually gaining strength since the beginning of the 21st century is minimalism, also defined as anti-consumerism, voluntary simplicity and deconsumption. These notions are not identical, although, according to research, the conceptual scope is very approximate. Minimalism means deliberately limiting consumption to the rational sizes that result from the natural, individual, physical and mental characteristics of consumers, while emphasising responsible decision-making in this area. The most common expression of processes related to minimalism is mainly the limitations in quantitative and structural consumption. The aim of the article is to present the state of knowledge about minimalism in consumption on the basis of the analysis of the Polish literature on the subject and the results of scientific research. In the case of consumption, minimalism is compared with other concepts and described in terms of the various research fields of consumption. In the case of trends in consumer behaviour, the term is contrasted with deconsumption and voluntary simplicity. It is indicated as part of a lifestyle of sustainable consumption, and occurs when discussing food wastage as well as fashion. It should be noted that the given issues are related to each other, and their separation/separate treatment results from the adaptation of individual principles and rules by different groups of consumers depending on their own needs.

‘Word of mouth’ (WOM) as a communication tool has evolved quite significantly over the last few decades. Originally, word-of-mouth communication was limited to local coverage, i.e. it was restricted only to the closest people in the circle of the sender of the message. Technological developments over the past 30 years, particularly in computer and mobile technologies, have brought about significant changes in this form of communication. The information provided has become global; the consumer can communicate directly with the entrepreneur. Examples of bibliographic analyses of only electronic word of mouth (eWOM) without consideration of traditional WOM can be found in the literature. It therefore seems important to try to analyse the literature collection on both WOM and eWOM. The article aims to identify and present the most frequently cited works (along with their authors), as well as the publications most frequently referred to by authors publishing works related to WOM. Citation analysis and co-citation analysis were used to realise the stated aim. The basis for the analyses is a collection of publications from the WoS database. The results obtained made it possible to identify and create a list of the most frequently cited and co-cited publications.

The article aims to identify the most influential authors and publications in the research area of hydrogen supply chains. The analysis of the European Union’s strategic documents and hydrogen strategies announced by individual countries indicate that using hydrogen in the economy is becoming significantly more important. Therefore, scientists exploring the above topics in various research settings and scopes should also expect growing interest. The hydrogen economy, including hydrogen supply chains (HSC) as a tool for its implementation, is still a relatively young and dynamic research area. This applies especially to the so-called green hydrogen supply chains where the hydrogen feedstock is the renewable energy source. This work is intended to facilitate the identification of the most essential items of already published scientific works. The work carried out a bibliometric analysis for the research area “hydrogen supply chains”. As a result of the research, the following were identified: (1) the most frequently cited publications and their authors, (2) the journals and authors that had the most significant impact on research in a given area, (3) the publications to be which are most often referred to by authors writing works in the field of HSC, and (4) changes in the importance of places of publication and authors over time. Due to the complexity of the research issues, it is crucial to determine the most significant scientific achievements to date. This should constitute the basic cognitive base for properly implementing newly undertaken research: the hydrogen supply chain.

Aim: To aim of this paper is to identify similarities and differences in the pro-environmental attitudes of consumers from different countries, as well as being representatives of different age cohorts. Methods: The analyses are based on the results of surveys conducted in four European countries (Germany, Italy, the Czech Republic, and Poland). An international quantitative survey using the author’s survey questionnaire was conducted using the CAWI technique on a sample of a total of 2,566 respondents. Association rules, which are among the data mining tools used to build descriptive models, were used in the data analysis. Results: The results presented in this study allow us to distinguish patterns of behavior in terms of pro-environmental attitudes and actions, as well as similarities and differences by age and place of residence in this respect. Respondents from older age groups (i.e., ‘Baby Boomers’ and ‘Generation X’) are significantly more likely to declare taking pro-environmental actions than respondents from younger age groups (i.e., ‘Generation Y’ and ‘Generation Z’). The opposite situation can be observed in the case of negative answers regarding taking pro-environmental actions. Conclusions: The authors of the study believe that the study should be repeated to check whether the declared attitudes and behaviors are the result of a specific situation that differs from other periods (the study was carried out during a pandemic) or whether they are of a constant nature, allowing us to see differences in consumer behavior between age groups and countries. Another possible direction under considera­tion for further research is to analyze the undecided group in more detail in order to determine the reasons for this.

Market changes in consumer behavior can take a desirable, positive form and be accepted by other market participants, or they can be contrary to accepted social norms. According to Fullerton and Punj [1998] such behavior is the great paradox of modern consumer culture. Dysfunctional consumer behavior has become an inherent part of modern consumer behavior. The purpose of this paper is to review the results of research on dysfunctional consumer behavior based on selected scientific publications. The presentation of research topics and results will be made in two separate parts. The first part concerns the dysfunctional behaviors of customers, i.e. the way they are presented in the literature and the factors determining such behavior. The second part includes a review of research results concerning the broadly understood consequences of dysfunctional customer behavior.