The increase in human activities, such as industrialization, urbanization, and transportation, has led to air pollution, including heavy metal contamination such as lead (Pb). Lead originates from vehicle emissions, industrial activities, and fossil fuel combustion, which have detrimental effects on the environment and human health. One effective method for monitoring air pollution is biomonitoring using bioindicators, such as lichen. Lichen is sensitive to air quality and can absorb pollutants, including heavy metals, through its surface. This study uses a literature review to analyze the role of lichen as a bioindicator of heavy metal pollution, specifically lead. Several lichen species, such as *Xanthoparmelia xanthofarinosa* and *Canoparmelia aptata*, are known to accumulate heavy metals from the environment. The results show that the lead content in lichen varies depending on the pollution level in the location. Areas with high traffic have higher lead concentrations compared to areas with low traffic. The advantages of using lichen as a bioindicator include low cost, practicality, and its ability to provide long-term data on air quality. With this understanding, lichen data can be used for pollution mitigation and evidence-based policies to reduce the impact of air pollution. Further research is recommended to explore the potential of lichen in detecting other heavy metals, such as cadmium (Cd) and copper (Cu).
 

Social conflicts in the oil palm plantation sector have become an increasingly prominent issue in various regions, with impacts that not only affect the relationship between parties, but also threaten and affect the sustainability of the industry, aspects of people's lives and the environment. Conflicts are often rooted in land disputes, dissatisfaction with compensation, and the environmental impacts of unsustainable plantation practices. This study aims to explore the impact of social conflicts on oil palm land expansion. It is hoped that this research can provide clear information about the relationship between social conflicts and oil palm land expansion, so that it can be used to find better solutions in managing and developing oil palm land in a more sustainable and equitable manner. The methods used are literature studies and literature reviews. Literature study is a research design used in collecting data sources related to topics. The collection of data sources for literature studies is carried out with a database search tool that is used as a stage to search for literature sources. The screening results from the journals that are appropriate and needed are 9 national articles. Based on the activities and journals, it was found and analyzed that the impact of social conflicts on the expansion of oil palm plantation land can have environmental, economic, and social impacts.

Public Green Open Space (RTH) is an essential element in urban spatial planning to support environmental sustainability. Through the process of photosynthesis, RTH helps absorb carbon dioxide (CO?) produced by human activities, such as transportation and industry, thus contributing to climate change mitigation. This study aims to explore the role of RTH in absorbing CO? and the challenges faced in its management. The study was conducted using a systematic approach through literature analysis and case studies in several cities in Indonesia and around the world. The research results indicate that vegetation type, area size, and environmental conditions are the main factors affecting the carbon absorption capacity of RTH. Large trees have a significantly higher capacity to absorb CO? compared to shrubs and grass, with the ability to absorb up to 250.63 tons of CO? per year per tree. However, challenges such as limited RTH area, urbanization pressure, and lack of public awareness remain obstacles to optimal RTH management. The recommendations of this study include increasing the area and quality of RTH through data-based strategies, community participation in management, and the development of policies that support sustainability. With proper management, RTH can function as a climate change mitigation tool while improving the quality of life for urban communities.
 

The Paguyaman watershed in Gorontalo is crucial for life, but it faces land degradation and erosion. This study evaluates land conditions using satellite imagery and spatial data. Results indicate that 58.73% of the area is in moderate condition, while 27.4% is in poor or very poor condition. Recommendations include reforestation with local species and integrated farming systems to improve soil fertility. Regular monitoring using remote sensing technology is proposed for the early detection of vegetation changes. Collaboration between the government, community, and researchers is essential to achieving sustainable watershed management.