In Poland, there is a growing awareness of the need to change the sources of electricity and heat. An expression of this is the adoption of the document entitled Poland’s Energy Policy until 2040 (PEP 2040) in February 2020 by the Council of Ministers. The goal of the Polish Energy Policy until 2040 is “energy security – ensuring the competitiveness of the economy, energy efficiency and reducing the environmental impact of the energy sector – taking into account the optimal use of own energy resources”. In PEP 2040, the previous assumptions of the state’s long-term energy policy were amended and an increase in the use of low- or non-emission sources was declared. In addition, the energy policy guidelines contain forecasts for the production of steam coal and the demand for this raw material. Based on the provisions of the document, as well as forecasts of the coal-production volume prepared by the authors and the assessments of experts in the fields related to energy and mining, the article contains considerations on the validity of the developed forecasts together with the determination of the production capacity of domestic mining enterprises in terms of covering the demand for steam coal used for the production of electricity and heat. It is planned, inter alia, that blocks of coal-fired power plants will be decommissioned and, in their place, there is to be the expansion of solar and wind energy and the commissioning of the first blocks of a nuclear power plant. Such activities, which cause a decrease in the demand for coal, are also related to the plans of changes in the functioning of mining enterprises – there will be successive closures of individual mines and mining plants.

The study presents results of the internal reliability analysis of structural modules used for the determination of horizontal displacement in incomplete trigonometric network. The influence of such elements as: number of control points, sight line length and arrangement of control points around the instrument station on reliability was analysed. Furthermore the analysis of the influence of diversification of reliability indices calculated for individual observations on the detection efficiency of non-dislocated control points was performed. The presented numerical example illustrates the possibility of incorrect valuation of control point stability because of a large diversification of reliability indices. The summary contains recommendations from the point of view of internal reliability for optimal designing of structural modules in incomplete trigonometric networks.

Occurrences associated with the phenomena of climate change are increasingly visible. Effects of progressive environmental pollution are monitored with growing concern. Still, in the construction sector, the choice of sustainable materials and the knowledge concerning them is insignificant. Studies have shown that single-family residential buildings form the largest share of new buildings in Central European countries. It should be assumed that it is the improvement of this particular section of the construction sector to be the goal of further development of societies. This paper presents a case study of the construction of a house using straw - a material that, on the one hand, is a product associated with local tradition, while significantly reducing carbon footprint of its production and use, on the other. The construction of a prototypical house with the application of composite technology, i.e. timber framing with straw bale infill, was compared with a conventional method (ceramic masonry units) which is currently the most popular choice for building single-family houses in Poland. The study is based on the building’s life cycle assessment (LCA) over its consecutive phases as a tested and reliable method of the verification of a material’s impact on the environment.

The primacy of the Bishop of Rome is the term for the highest office in the Church. It consists in carrying out a mission appointed to St. Peter and his successors by Christ. The truth about the primacy is a theoretical plane, dogmatically defined at the I Vatican Council in 1870. It also has a practical dimension, which depends on the individual popes and the particular historical context. A characteristic feature of the pontificate of John Paul II was the implementation of the reforms of the II Vatican Council and the Church’s preparation for the Great Jubilee of the third millennium. John Paul II realized the primacy function in accordance with the tradition of the Church, on the grounds of the biblical image of Peter the Apostle, and continuing the line of his predecessors – John XXIII and Paul VI. The leading element of his pontificate was the openness to the world, to man and his dignity, or sensitivity to the signs of the times. The priority at the level of ecclesial unity was a concern for the community at all levels, including the ecumenical field. John Paul II realized the primacy ministry as Servus servorum Dei, in the ancient formula – priority in love .