The aim of the article is to analyze the level of the knowledge-based economy (KBE) in the European Union countries in terms of sustainable development. The added value of the work is the presentation of research results at different levels of data aggregation (EU countries, EU macro-regions, EU regions). This type of approach was used for the first time in this study. The research assumes that knowledge and skills are one of the basic factors in implementing the concept of sustainable development. Currently, there are very large disproportions at the level of KBE in the countries, macro-regions, and regions of the EU. It also translates into their socio-economic situation and thus into competitiveness and innovation. The highest level of KBE is in north-western and central Europe countries, while the lowest is in the countries of eastern and south-eastern Europe. This regularity also applies to macro-regions and regions located in these countries.

Farms in Poland come in a wide variety of sizes, and the effect of farm size on the profitability of labor has not been sufficiently investigated. This paper takes a fresh look at the model for labor profitability determinants of family farms in Poland in relation to their economic size. The purpose of this paper is to analyze the factors that determine the labor profitability index in farms of various economic size classes (classes ES1–ES5). In the analysis of factors shaping the profitability of labor in family farms, a panel analysis was applied. Family farm income expressed per family labor unit was adopted as the dependent variable. The following variables were used as explanatory variables: (1) macroeconomic index of price relations (“price gap”); unemployment; average monthly gross wages and salaries; inflation; (2) technical-agricultural production efficiency index; (3) microeconomic ratio of total assets to agricultural land; technical equipment for work; land-to-labor ratio; debt ratio, subsidy ratio, and investment effort. A diversified influence of selected factors determining the level of profitability of labor in agriculture in particular groups of farms was found. The econometric models developed also indicate different strategies that are adopted by farmers on various farms. There is no single solution here; strategies for improving the profitability of work must take into account the specificity of a given entity. The models estimated indicate the necessity of using other mechanisms and tools of agricultural policy for farms of various economic sizes. It should be expected that, in the future, there will be a dichotomous development of farms. Medium-sized farms will become larger and economically effective, and smaller farms will perform residential functions, with the disappearing function of agricultural production.

The share of renewable energy sources (RES) in the global energy system is systematically increasing, making them the most important element of the energy transformation. Their use enables rational management of limited resources, reduction of environmental pollution, and has a significant inhibitory effect on energy poverty by improving energy efficiency. The aim of this article is to assess the impact of the use of renewable energy on the level of energy poverty in the European Union countries in 2010, 2015, and 2022. A taxonomic measure of development based on the Weber median was used to examine the relationship between the results achieved by individual EU member states in terms of the impact of the use of renewable energy on the level of energy poverty. The research results clearly indicate the existence of disproportions between the countries of the “old” EU and the countries that joined it in 2004 and later. These disproportions concern both the use of energy obtained from renewable sources and energy poverty. In the countries of the “old” Union, a positive moderate relationship was identified between the use of renewable energy and energy poverty, which means that a higher share of the use of energy from renewable sources in these countries reduces energy poverty. In the countries of the “new” Union, however, this relationship was very weak (2010) or non-existent. Since the renewable energy sector is subject to government policy and regulations, the results presented in this paper should be of interest to decision-makers. A stable, long-term policy should provide an appropriate investment climate that provides support for renewable energy projects and reduces the level of energy poverty.

This study aims to present the current status and forecasts related to the generation of energy from renewable sources, as well as the challenges and barriers resulting from the development of this energy in the European Union countries. The research procedure consists of three stages: bibliometric analysis of scientific publications conducted based on the Web of Science database, visualization of results using VOSViewer software (version 1.6.20), and in-depth analysis of the content of the publications. The study covered two periods. The first one covered the years 1990–2024, in which publications on sustainable development and renewable energy sources began to appear around the world. The second one included publications from 2002, because the first works on European Union countries were identified in that year. The final sample included 96 articles that identified key links between sustainable development and renewable energy. These topics accounted for 50% of all issues discussed in these articles. It turned out that one of the most important challenges of modern economies (21.9% of the articles examined) is finding a balance between sustainable economic growth and limiting environmental degradation. The literature review also shows that the renewable energy sector in the EU and its Member States is developing dynamically. This was confirmed by Eurostat data on both renewable energy production and consumption.

The main goal of the paper was to analyze the level of energy poverty in EU countries, with particular emphasis on three years: 2010, 2015 and 2022. The basic definition of energy poverty assumes a situation in which a household is unable to provide for an adequate level of energy services at home. Choice of the time period for the analysis was dictated by the availability of statistical data and, on the other hand, by the desire to analyze the impact of the time factor on the phenomenon under study. The application of the modified TOPSIS method for the construction of synthetic measures, in which common coordinates of the Positive Ideal Solution and Negative Ideal Solution were calculated for all analyzed periods, made it possible to assess the dynamics of the analyzed phenomenon between these periods. The carried out analyses show that EU countries remain differentiated in terms of energy poverty levels, but that this variation has been decreasing over time. This clearly indicates that the level of the examined phenomenon is equalizing in the analyzed group of countries. Particularly important was the improvement in the positions of the member states, whose accession took place after 2004. An in-depth comparative analysis of changes in energy poverty levels between the “new” and “old” member states is the essential added value of this work. Due to the changing geopolitical conditions in Europe and around the world, it should be borne in mind that not only developing countries will face energy shortages. Therefore, the authors believe that it is crucial to commit to political actions and to conduct scientific research on the widest possible use of various types of energy in order to reduce energy poverty.

The aim of the article is to show that in rural areas, with particular emphasis on former state-owned farms, which were created as a result of changes in the forms of land ownership, mainly in Central and Eastern European countries, the economic situation of households is still worse than in the areas where there were no State Agricultural Enterprises (PGR). Research in Poland served as a case study. Selected methods of descriptive statistics and multivariate comparative analysis were used in the analyses. The results presented in the study at different levels of aggregation (voivodeships, poviats, and communes) allowed the identification of the regularities in the situation of rural areas. Among the beneficiaries of social assistance, most of the people live in rural areas and have a high unemployment rate; the problem of unemployment especially concerns those areas where the rural population with lower education levels predominates. Moreover, in former state-owned farms, the total disposable income per person is lower than in other areas, and the funds from the government program “Rodzina 500+” constitute a significant contribution to household budgets.