Forests play a significant role in the mitigation of climate change through carbon storage and sequestration. However, a forest’s capacity to absorb carbon is influenced by a number of factors, such as soil characteristics, the selection of tree species, and the application of silvicultural practices. A study in Latvia was conducted to evaluate the carbon stock and sequestration potential of birch, common aspen, black alder and grey alder growing on periodically waterlogged and drained organic soils. Empirical data of forest resources were obtained from the National Forest Inventory (NFI) from 2016 to 2020. The findings indicate that black alder may thrive in both soil types, as it showed the best increase in carbon stock in periodically waterlogged soils, reaching a maximum of 129 t C haE−1 at the age of 61–70 years. Greater carbon sequestration in tree biomass occurs on drained soils compared to periodically waterlogged. Birch, aspen, and black alder stands may store between 106 and 119 t C haE−1 at age of 61 and 70 years, which is similar to grey alder stands at ages of 31–40 (114 ± 0.73 t C haE−1). Therefore, a short rotation for grey alder growing on drained organic soils could maximize carbon accumulation and add substitution value. These results suggest that different types of deciduous trees have varying capacities for carbon storage and sequestration, and that it’s important to consider site-specific factors, rotation age and silvicultural practices when aiming to maximize carbon sequestration in tree biomass.

The use of the smoke released during the wood burning process to prepare food products is a centuries-long tradition, practically all over the world. However, during the combustion process, a group of compounds called polyaromatic hydrocarbons (PAHs) are formed in the flue gases, which are carcinogenic and condense during the smoking process and diffuse into the smoked food product. Therefore, permissible PAH norms have been set for food producers, which significantly complicate the use of wood. In the study, using a gas analyser, we measured the flue gases released during the burning of specially made, apple and grey alder wood pellets, with and without enrichment of the supplied air with ozone. The use of ozone does not ensure a higher burning temperature of pellets, but it stabilizes it – temperature fluctuations are significantly wider using non-ozonised air (697 to 817 and 611 to 817 ℃, respectively). The content of CO2, CO, as well as CH4 and N2O increases significantly in apple wood flue gases using ozonised air, while CH4 increases and N2O decreases in grey alder smoke. Which generally indicates specific reactions with ozone during combustion. Comparing the flue gases released during the burning of apple and grey alder wood pellets, grey alder smoke contains significantly more N2O and CO2 than apple wood pellet flue gases. On the other hand, using ozonised air in the combustion process increases N2O significantly in the flue gas of apple tree pellets compared to white alder.

Meat products play an important role in the human diet. They are one of the main sources of proteins, trace elements, structural components, as well as vitamins that stimulate human growth and physical activity. Raw meat refers to perishable food. There are many methods of preserving the quality and shelf-life of meat products, however, in recent years, freeze-drying is becoming more and more popular, and it combines two technological steps — freezing and vacuum drying. During the process, the product undergoes dehydration by removing water to a humidity level of 2–5%. The principle of the process involves transforming the product from a frozen phase to a gaseous phase, bypassing the liquid phase. The purpose of the article is to study the possibility and relevance of the freeze-drying process in the meat industry and to examine its advantages and disadvantages, as well as the probability of growth. During this research it was revealed that in the use of freeze-drying in the meat industry for certain purposes, it is still necessary to study and adjust in order to introduce it into a particular production. However, with regard to large enterprises where various production problems often arise this technology would not only help solve these problems, but also increase the range of innovative products and expand sales markets.

Nowadays, different sun protective creams are available in the market, but most of them contain harmful synthetic chemicals and minerals which can induce skin allergies and premature ageing. Usage of sunscreens and photoprotectors of natural origin and natural antioxidants can reduce skin damage caused by excessive sun exposure. The effectiveness of the use of β-carotene — vitamin’s A precursor against excessive irradiation caused by oxidative stress cell damages has been proven of its very good antioxidative properties and leading to sooner regeneration of the skin after several environmental damages. Carotenoids and high value oil can be extracted from pumpkin (Cucurbitta spp.) by-products — peel and seeds with SC CO2. The objective of this study was to incorporate pumpkin seed oil (PSO) and carotenoid extract (CE) from pumpkin by-products in to facial creams for UV protection. Two types of creams with PSO and CE were prepared emulsion o/w and w/o. A cream without extracts and natural ingredients was used as control sample. The sun protection factor values in vitro (SPF = 0.92 to 1.18), total content of carotenoids (TCC = 1.08–17.95 µg mLE−1), β-carotene content (0.64–0.72 µg mLE−1), total phenolic content (TPC = 62.64–95.82 mg GAE gE−1), antiradical scavenging activity (11.26–43.66 %) and rheological behaviour of facial creams were determined. Although creams with CE and PSO show comparatively low SPF values, ß-carotene and phenolic compounds found in samples demonstrated very high antioxidant abilities valuable for skin protection.

Social benefits are essential in providing support to families with children, especially in the first years of the child’s life as well as to families at risk of poverty (large families, parents raising a child alone). Social insurance benefits ensure parents with income while taking care of a child. Latvia’s strategic planning documents have defined social protection for families with children as one of the priority areas for several planning periods simultaneously emphasising the need to increase social security and promote the birth rate in the country. The research aim is to assess the social benefits system for families with children in Latvia. The research results allow concluding that the expenditure for social support for families with children as percentage of GDP in Latvia is lower than the average EU Member States indicator as well as it is the lowest one among the Baltic States. Support for families with children in Latvia is gradually growing; however, it is necessary to regularly increase the childbirth allowance taking into account inflation in order not to worsen the financial situation of these families as well as to allocate a larger proportion of GDP to support families with children in Latvia.

Late-life suicide is a significant public health concern that has been associated with a range of social and individual factors. Social factors, such as social isolation, lack of social support, and financial stress, regional differences can contribute to the risk of suicide in older adults. Individual factors, such as depression, anxiety, and other mental health disorders, as well as physical health problems and chronic pain, have also been associated with an increased risk of suicide in older adults. Understanding the social and individual factors that contribute to late-life suicide in both Latvia and Norway is essential for developing effective prevention and intervention strategies to address this issue. The novelty and aim of research on social and individual factors of suicide among older people lie in understanding the unique risk factors that contribute to late-life suicide both in urban and rural areas. While there is existing research on suicide in general, there are various factors that contribute to suicide risk in older adults. Regional differences are often different from those that affect younger populations. Therefore, research on social and individual factors of suicide among the older persons aims to identify these unique risk factors and develop tailored prevention and intervention strategies that address the needs of older adults. There is still a need for further research to understand the specific social and individual factors that contribute to this issue in rural and urban areas.

In August 2021, we carried out a study of the needs of socially isolated people in the Preiļi and Līvāni districts of Latvia. The aim was to identify the real situation of social exclusion in rural areas of Latvia in order to provide a more complete picture of the needs of socially excluded groups and thus contribute to regional development policy, especially from the perspective of social inclusion. The qualitative research approach was chosen to acquire information: interviews with representatives of socially excluded groups and semi-structured interviews with professionals working with different categories of socially excluded people. Social exclusion is a sensitive topic for those who are socially disadvantaged, so the basic principles of research ethics were strictly observed: personal autonomy, non-harm, confidentiality and fairness. The study found that the most pronounced form of social isolation is exclusion from the labour market. People who are unemployed, are trapped in a ‘poverty cycle’ from which they cannot escape without the help of social institutions. The information obtained does not confirm the long-standing assumption that long-term unemployed are mere ‘consumers of the system’, nor does it confirm the assumption that socially isolated people have high expectations of a high salary. Sometimes existing attempts to improve the situation of socially isolated people are not in line with their real needs, thus failing to achieve the intended goal. In general, the specificity of the region is such that there are no mass one-size-fits-all solutions, but each situation and problem has to be tailored individually.

Developed transport and storage sector has up-most importance for production capacities in regions, especially in rural areas, ensuring supplies and deliveries, including well-developed and maintained infrastructure, transport vehicles, IT systems and human capital. Till 2040 demand for highly-educated and qualified logistics specialists will increase in Latvia due to growing labour costs, introduction of new technologies and digital solutions. The aim of the study is to identify the recent trends that give valuable findings for education and regional development policy elaboration and implementation in order to achieve balanced regional development promoting also rural development. The findings reveal that the higher the share of population with higher education the higher the wages. The regions with the larger share of population with higher education are mainly urban and pre-dominantly urban regions. However, transport and logistics sector is in all regions as well as demand for logistics specialists. Balanced regional development is crucial for sustainable development in national and the European Union level.

It is generally estimated that gas, which generates more than half of the greenhouse gas (GHG) emission from waste industries in landfills, is seen as a serious environmental problem worldwide. It is therefore essential to promote management methods to reduce GHG emissions from landfills as well as other sources. One way of achieving this is the usage of different types of biocover applied to them. The aim of this study is to clarify the impact of the biocover created on GHG emissions. An experiment was conducted in laboratory conditions that studied the effectiveness of biocover developed in the laboratory. Three experimental columns with a diameter of 160 mm and a height of 1500 mm were created. Active compost saturated with water at a thickness of 500 mm was used as a source of methane, a permeable layer of sand at a thickness of 300 mm was further formed and finally covered with biocover. Biocover represented 60% of fine-fraction waste, 20% of soil and 20% of compost. The experiment was launched on June 6, 2022, and the first measurements were made two weeks later. All measurements were performed with the CRDS gas measurement device Picarro G2508 (Picarro Inc., USA California). All data analysis was carried out using Descriptive statistics methods. The largest reduction in emissions is projected directly for methane emissions, as biocover technology is appropriate to reduce methane emissions. Other GHG emissions are also expected to be reduced. NH3 emission measurements were also carried out to investigate the impact of the biocover on it. This experiment shows that the biocover created is effective and can be composed of material that has already been served. The experiment is intended to continue to obtain long-term data on the development of biotransformation and to develop more promising approaches in the future to reduce GHG emissions from landfills.

The transformation from a linear to a circular economy model is a political priority of the European Union to develop sustainable and more efficient raw materials and waste management. The wastewater sector is an important element in the circular economy with a great potential for resource recovery such as phosphorus recovery from waste streams. With this in view, the present study’s aim was to analyse data on municipal wastewater treatment plants (>2,000 p.e.) in Latvia and the present situation with newly developed circularity indicators on waste reduction, pollutants removal, resource recovery and water reuse; thus, enabling evaluation of the level of transformation towards circularity in Latvia’s wastewater treatment plants and their future perspectives. The results showed that the wastewater sector in the country complies with legal obligations, but on the other hand, only a few solutions are practised in compliance with the principles of circular economy, i.e., reduction of wastewater discharge and increasing sewage sludge utilization as fertilizer in agriculture.