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Biogas is a potential renewable energy source to meet energy needs, especially in remote areas that do not have access to electricity. The process of making biogas is carried out through anaerobic fermentation of organic materials such as vegetable waste, livestock manure and agricultural waste. This research aims to design a batch type biodigester that can produce biogas from a mixture of goat manure, chicken manure and vegetable waste. Biodigester is a reactor used to produce biogas. The stirred biodigester aims to mix the substrate evenly in the biodigester and prevent the formation of scum. The biodigester designed has a capacity of 120 liters with a stirring system to increase the efficiency of biogas production. The fermentation process was carried out for 21 days by monitoring parameters such as temperature, pH, Chemical Oxygen Demand (COD), and methane gas concentration (CH4). The results showed that the temperature and pH in the biodigester remained in optimal conditions for the activity of methanogenic microorganisms. The highest CH4 concentration measurement was recorded on day 20 at 60%, which indicates good biogas quality. In addition, the flame test on day 21 produced a blue flame, indicating a high CH4 content. The decrease in CH4 concentration at the end of the study was caused by the exhaustion of organic material. This research contributes to the development of efficient and environmentally friendly biodigester technology to produce biogas as a renewable energy source.

This study aims to analyze the relationship between service quality and customer green satisfaction at Madani Hotel Medan. The service quality in question includes aspects such as reliability, responsiveness, assurance, empathy, and physical evidence, which are integrated with environmentally friendly practices implemented by the hotel. Green satisfaction refers to the level of customer satisfaction that is not only based on conventional services, but also on the hotel's commitment to environmental sustainability. The research method used is a quantitative approach by distributing questionnaires to 100 respondents who are guests of Madani Hotel Medan. Data were analyzed using a linear regression method to determine the effect of service quality on green satisfaction. The results of the study indicate that there is a positive and significant relationship between service quality and customer green satisfaction. This finding indicates that the implementation of high-quality and environmentally friendly services can increase overall customer satisfaction. This study provides implications for hotel management to continue to improve service quality by paying attention to sustainability aspects in order to meet the expectations of increasingly environmentally conscious customers.

This community service activity aims to integrate theory and practice through the construction of simple shelters by the academic community of the Vocational Program at Gorontalo State University. The activity is motivated by the need to improve the technical competence and social skills of building architecture students. The method used is participatory action learning, involving students and faculty members from planning to evaluation. The activities include group division, case studies at brick and block factories, construction of the lower, middle, and upper structures, and final assessment. The results showed that 70% of students mastered construction skills in accordance with simple building standards, with the final product being a functional shelter. The main challenges faced were team coordination and time management. Discussions confirmed that this model is effective in enhancing technical skills, teamwork, and understanding of sustainable construction, and is worth replicating in other vocational programs. The shelter construction also provided an opportunity to reflect on real-world applications of architectural theory, while addressing pressing community needs. Through active participation, students gained firsthand knowledge in applying design concepts and construction techniques that are crucial to the construction industry. Furthermore, the activity demonstrated the potential for developing students' abilities to apply architectural concepts that are not only relevant to academic requirements but also to practical, community-based construction needs. The project also emphasized the importance of sustainable building practices, focusing on materials and methods that minimize environmental impact. The construction of the shelter not only provided practical experience but also enriched students' knowledge in creating environmentally friendly and sustainable construction solutions.

Dead skin cells can occur due to many factors, such as increasing age, sun exposure, and an unhealthy lifestyle. Signs of skin problems due to the buildup of dead skin cells are dull skin, acne, and dry skin.  Body scrub is a type of skin care that can provide many benefits for skin health and beauty. Scrub is the process of exfoliating dead skin cells using a scrub or natural ingredients. Pedada fruit scrub is a natural beauty care innovation originating from the coast of Indonesia, especially from areas rich in pedada fruit plants (Sonneratia spp.). Pedada fruit is known to have high antioxidant content which can provide benefits for the skin, such as brightening it, reducing wrinkles, and fighting the effects of free radicals. This scrub uses pedada fruit extract which is rich in flavonoids, tannins and vitamin C to care for the skin naturally. This body scrub product not only offers beauty benefits but is also environmentally friendly because the raw materials are easy to find in coastal areas and do not require complicated chemical processes. This research aims to examine the benefits of pedada fruit scrub as a natural beauty solution that is rich in antioxidants.

This research aims to see how sharia capital market instruments contribute to green infrastructure funding in Indonesia. This research is library research which analyzes the contribution of the sharia capital market, especially through instruments such as green sukuk, to the acceleration of green infrastructure development in Indonesia. From the research results, it is known that the contribution of the sharia capital market to accelerating green infrastructure development lies in its ability to provide sharia-based financing for environmentally friendly projects. Through instruments such as green sukuk, the Islamic capital market supports renewable energy projects, sustainable transportation and natural resource management. By meeting long-term financing needs, the Islamic capital market helps accelerate the realization of green infrastructure that supports sustainability goals, including Sustainable Development Goals (SDGs), and reduces the impact of climate change.

People's mining activities in Gamey Village, Uwapa District, Nabire Regency, Central Papua Province are carried out to meet daily needs and improve the welfare of the local community. This mining activity is based on alluvial deposit conditions and is applied for mining sediments on the surface and using alcon machines. for high pressure water spray. This community mining activity is divided into several stages starting from preparation of mining land, processing and production processes as well as selling gold products for sale. This research aims to examine the gold processing used by small-scale miners in Uwapa District, Gamey Village, and its impact on the environment and public health. The main focus of this research is on the use of the sluice box method, which is the gold processing technique most commonly used by local communities. This method was chosen for its simplicity and low cost, although the gold recovery efficiency varies between 50-70%. Additionally, this research evaluates alternative technologies such as shake tables and centrifuges that can increase gold recovery efficiency and be more environmentally friendly. The research results show that the implementation of alternative technology requires training, procurement of adequate equipment and infrastructure as well as ongoing monitoring. By adopting better technology, it is hoped that gold mining activities in Gamey Village can run more productively and sustainably, improving community welfare without damaging the environment.

This study examines the impact of green talent management practices on HR performance quality in eco-friendly hotels in Central Java, Indonesia, using a phenomenological approach. Through in-depth interviews with 24 participants across six star-rated hotels, direct observation, document analysis, and focus group discussions, the research explores how green HRM practices influence employee performance and career development opportunities for young talent. The findings reveal that eco-friendly hotels have implemented various green talent management practices including environmentally-conscious recruitment, sustainability training, green performance management, and employee involvement in environmental initiatives. These practices positively impact multiple dimensions of employee performance: task performance through improved resource efficiency; contextual performance through enhanced teamwork; adaptive performance through increased innovation capability; and environmental performance through strengthened pro-environmental behaviors. The effectiveness of these practices is influenced by top management commitment, integration with business strategy, training quality, organizational culture, and resource availability. Young employees perceive involvement in green initiatives as valuable for developing leadership skills, expanding professional networks, and enhancing market competitiveness, although they identify the need for clearer sustainability-focused career paths. The study contributes to GHRM and talent management literature by explicating the mechanisms linking green talent management with performance outcomes in the hospitality industry context, while providing practical implications for hotel managers seeking to enhance both environmental sustainability and human resource performance. The research underscores the importance of a holistic approach to green talent management that aligns environmental priorities with employee development and organizational strategy.

The largest source of energy currently utilized is still predominantly from fossils. Fossil energy sources are non-renewable so over time they will run out. So it is necessary to utilize renewable energy sources. One renewable energy source that is environmentally friendly and easy to obtain is wind energy. Wind is a collection of air that is experiencing movement due to a difference in pressure on the earth's surface. Wind will move from areas of high pressure to areas of lower pressure. Experimental research on wind energy is a useful energy that can be put to good use. Wind energy is a form of energy that comes from utilizing air flow in the atmosphere to produce mechanical or electrical energy. The main technology used to utilize wind energy is a wind turbine, which converts wind kinetic energy into electrical energy through a generator. Which of course also requires sufficient wind speed so that the wind turbine can rotate and produce mechanical movement in the form of rotational torque which can then be converted into electrical energy. Wind energy has great potential as a clean, sustainable and environmentally friendly resource, as it does not produce greenhouse gas emissions or hazardous waste during its operation. However, wind energy development faces challenges such as fluctuations in wind speed, large land requirements, visual impacts, and potential disruption to local ecosystems. With technological innovation and careful planning, wind energy can be a significant solution to meet global energy needs in a sustainable manner.

This study aims to explore the application of turmeric as an acid-base indicator in science learning at Madrasah ibtidaiyah ihya ulumiddin banjarmasin, as well as to understand students' perspectives on the use of turmeric in acid-base reaction experiments. The research method employed is a qualitative approach, utilizing interviews and observations with students at the madrasah. In the experiment, turmeric is used to indicate pH changes in solutions of Sunlight soap as a base and lime juice as an acid. The findings reveal that students have a good understanding of the acid-base concept and recognize the benefits of using turmeric as a natural, easily accessible, and environmentally friendly indicator. Based on interview results, students also expressed that this experiment made science learning more engaging and easier to comprehend. This study is expected to provide new insights into more contextual and applicable science teaching at the madrasah level.

By modifying three traditional canting designs using the House of Quality (HoQ) method, this article discusses the development of a portable electric canting. The main focus of this research is to use electrical technology to improve the convenience and efficiency of the batik-making process. Each new design has a recharging system that allows the user to recharge the power source. User needs and wants were discovered and incorporated into the technical specifications of each design through HoQ analysis. Research shows that these changes not only improve tool performance but also make the batik-making process safer and more environmentally friendly. Therefore, through the development of relevant and sustainable technologies, this project contributes to the preservation of Indonesia's batik culture.    

This study discusses the urgency of green marketing strategies and practices due to changes in consumer behavior trends. Currently, environmental sustainability issues are a major concern for society, not interacting in their product and service consumption activities. This study was conducted using a qualitative method, namely a literature review. Of the 15 article titles described, most of them show that the implementation of environmentally friendly marketing strategies brings positive benefits to businesses. Specifically, what is studied in this study is its influence on environmentally friendly purchasing decisions, customer loyalty and brand image enhancement. These findings can be practical recommendations for business actors and marketing practitioners to develop various environmentally friendly product and service innovations and carry out innovative green marketing practices in the future. So that they are able to gain benefits in the form of increased sales, customer loyalty and positive brand image as well as contributions to environmental sustainability or desires.

Business disputes are increasing in Indonesia along with the growth of economic relationships. Litigation is often perceived as time-consuming and costly, making Alternative Dispute Resolution (ADR) a more efficient and relationship-friendly alternative. This study aims to analyze the obstacles and opportunities in implementing ADR for business dispute resolution in Indonesia, based on the legal framework provided by Law Number 30 of 1999. The research employs a normative legal approach with descriptive analysis. Data were collected through literature reviews of legal regulations, academic literature, and journal articles. The findings reveal that although ADR holds significant potential for resolving business disputes efficiently and cost-effectively, its implementation faces several challenges. The primary obstacles include the lack of awareness among business actors about ADR's benefits, the perception that ADR lacks the legal authority compared to litigation, and the limited quality of mediators and arbitrators. The study also highlights the importance of enhancing the capacity of ADR practitioners through continuous training and educating business actors to build trust in this method. By addressing these challenges, ADR is expected to become the primary choice for resolving business disputes, fostering a conducive business environment, and supporting long-term economic growth in Indonesia.

This community service was conducted at MI Darul Hidayah involving 17 fifth grade students as subjects. Making ecoprints is a creative effort to introduce environmentally friendly concepts to students at Madrasah Ibtidaiyah (MI) Darul Hidayah. Ecoprint is a fabric dyeing technique using natural materials such as leaves, flowers and twigs, which produces unique patterns without using dangerous chemicals. This community service aims to provide innovative environment-based learning to students through ecoprint making activities, while increasing their awareness of the importance of environmental conservation. The methods used in this activity include planning, implementation and evaluation stages. Students are taught to choose natural materials, arrange patterns on fabric, and apply ecoprint techniques using a heating or pounding process. As a result, students were able to create simple ecoprint products such as tote bags with creative designs. Apart from that, this activity succeeded in increasing students' understanding of the concept of recycling, the use of organic waste, and the importance of protecting the environment. The conclusion of this community service shows that ecoprint activities not only strengthen students' fine motor skills, but also foster the values of love for the environment, creativity, and cooperation. It is hoped that this activity can become a sustainable educational program at MI Darul Hidayah to support environment-based learning.

E The integration of Environmental, Social, and Governance (ESG) principles into e-procurement systems offers a pathway to achieving sustainable public procurement in Indonesia. This study explores relevant ESG criteria and formulates strategies to enhance the capacity of procurement personnel in implementing these principles. The findings highlight the importance of incorporating environmental criteria such as energy efficiency, eco-friendly materials, and waste management; social criteria like labor standards compliance, local MSME empowerment, and gender equality; and governance criteria including transparency, anti-corruption, and tax compliance. While e-procurement provides a digital platform to improve efficiency and transparency, challenges such as limited awareness, capacity gaps, and the absence of specific ESG guidelines hinder effective implementation. To address these issues, the study proposes strategic measures, including the development of ESG-based evaluation systems, comprehensive training programs for procurement personnel, and robust monitoring frameworks. These initiatives aim to align procurement practices with the principles of Sustainable Public Procurement (SPP), ensuring that procurement contributes to environmental sustainability, social equity, and better governance. By overcoming existing barriers and fostering collaboration among stakeholders, Indonesia can position itself as a leader in sustainable procurement practices. This research provides practical recommendations to integrate ESG into procurement systems, paving the way for a more accountable, equitable, and sustainable procurement framework.

A collection of shoes that are not neatly arranged often makes you lazy to tidy up and clean them, whereas the condition of scattered shoes can spoil the view and reduce the durability and functionality of the shoes themselves. On the other hand, plastic waste, especially plastic bottles, is increasing and becoming a serious problem for the environment. In an effort to reduce the impact of pollution and utilize unused items, this study proposes a solution in the form of making a shoe rack from used plastic bottle waste. The use of plastic bottles not only reduces the amount of waste but also provides a practical solution for more organized shoe storage, especially for students who need efficient and environmentally friendly shoe storage space. The method used in this study is (R&D), which aims to develop a shoe rack product and test its effectiveness and feasibility. The test results show that this shoe rack can accommodate 12 pairs of shoes with a maximum strength of 5.5 kg per rack consisting of three levels. The use of 69 plastic bottles for the base and 24 bottles for the walls provides a large enough capacity to store shoes. Based on the test results, this shoe rack not only functions as a place to store shoes, but also as an effort to reduce plastic waste and support environmental sustainability. This product can also be used as an example in learning product design, recycling, and entrepreneurship.

This study aims to describe and analyze the implementation of character education in students of Mawar Saron Karangpasar Kindergarten, Tegowanu District, Grobogan Regency in 2020/2021 based on 18 character values, namely religious, honest, tolerant, disciplined, hard working, creative, independent, democratic, curiosity, national spirit, love of the homeland, respect for achievement, friendly/communicative, love of peace, love of reading, care for the environment, care for society, and responsibility. The type of research used in this study is descriptive qualitative. The subjects of this study were the principal, class teachers, Character Education subject teachers, and parents of students. The data collection techniques used were interviews, observation, and documentation. The data analysis technique used was the Miles and Huberman model data analysis technique. The data validity test used was the credibility test, reliability test, and confirmability test. Based on the research results, information was obtained that the implementation of character education for students of Mawar Saron Karangpasar Kindergarten, Tegowanu District, Grobogan Regency in 2020/2021 in learning activities and outside learning activities was carried out in various ways. The implementation of character education in learning activities is implemented through five models, namely habituation, learning methods, conditioning, role models, and providing motivation, advice, understanding and appreciation. The most prominent character values ​​in the implementation of character education in learning activities are religious, disciplined, independent, and curious. Meanwhile, the implementation of character education outside learning activities is implemented through habituation, provision of school facilities, provision of school programs, role models, and provision of motivation and appreciation. The most prominent character values ​​in the implementation of character education outside learning activities are the values ​​of tolerance and caring for the environment.

The population density in Surabaya City makes the needs of the community, one of which is transportation, high. Transportation has an important role in meeting the needs of the community in everyday life in the economic, socio-cultural and political fields. Unfortunately, this has led to traffic congestion. Thus, Surabaya City is trying to improve the public transportation system by launching environmentally friendly public transportation as an effort to implement a green economy, namely Suroboyo Bus. This research uses a qualitative method with a library research approach. Information was obtained from various institutional reports, scientific articles, websites, books, and related regulations. The focus of data acquisition sources is credible journal publishers. The results showed that congestion in Surabaya City was reduced due to the enthusiasm of the community to switch to public transportation compared to private vehicles to reduce greenhouse gas emissions. In addition, the Suroboyo Bus payment innovation by exchanging plastic bottles has succeeded in attracting the interest and awareness of some people in Surabaya City to manage plastic bottle waste, although there are still other complaints in the implementation of the policy. The role of Suroboyo Bus as an effort to improve the green economy can be said to be quite successful, but improvements still need to be made and the involvement of the government and the community so that Suroboyo Bus continues to be an environmentally friendly sustainable transportation.

This study aims to analyze waste management in Indonesia from 2001 to 2022, and identify challenges and solutions that can be implemented to improve the effectiveness of waste management. Waste is a major problem affecting the environment and public health, with around 34.29% of waste in Indonesia not being managed properly. This research uses a descriptive approach by analyzing data related to policies, infrastructure, and community participation in waste management. The results showed that although there are regulations governing waste management, the main challenges faced are low public awareness and limited waste management infrastructure in many regions. The research also found that collaboration between the government, communities and the private sector is crucial in creating sustainable solutions. In addition, the development of environmentally friendly waste management technologies, such as Waste Power Plants (PLTSa), can be an innovative solution to reduce the negative impact of waste on the environment. This research suggests the need to strengthen regulations, increase public awareness, and develop more efficient and environmentally friendly waste management technologies.

  Utilization of new renewable energy is a solution to meet the increasing electricity demand, one of which is solar power generation technology. Solar panels are a renewable power generator that is environmentally friendly. The relatively low and unstable output voltage of PV is affected by solar irradiation, which becomes a constraint. Therefore, by utilizing a boost converter, the solar panel system is able to work 25% more optimally compared to without using a boost converter. The performance of solar panels when using a boost converter is around 83.3% and without using it, the performance is only about 58.3%. The average output power when using the boost converter is 1,521 W, whereas without using the boost converter, the average output power is 1,172 W. This indicates that the output power is more stable when using the boost converter compared to not using it. This research focuses on a boost converter with PID control as a support, optimizer, and voltage stabilizer where the output power on the solar panel is expected to be more optimal and the output from the solar panel is more stable with more optimal results in various conditions. In this study, 12 solar panels of 125 WP with a capacity of 1.5 KW are used in series-parallel to obtain the required power. If the output from the solar panel is insufficient due to weather conditions, the voltage will be increased by the boost converter towards the inverter so that the voltage remains stable into the inverter with the boost converter. This boost converter uses PID control to keep the output voltage stable.  

This research aims to design and test a genset fuel conversion system from gasoline to HHO gas (brown gas) as a more environmentally friendly alternative. Conventional fossil-fueled generators face challenges in theform of limited resources and the impact of environmental pollution. In this study, HHO gas is produced through a water electrolysis process using an HHO generator that separates water molecules into hydrogen and oxygen using electric current. The test results show that increasing the voltage from 2.58 V to 5.12 V significantly increases the volume of gas produced. At a voltage of 2.58 V, the gas volume reached 110 ml, and increased to 750 ml at a voltage of 4.72 V. The generator set was successfully operated for 1 minute 15 seconds with HHO gas using a separate battery power source. These results demonstrate the potential of HHO gas as an efficient alternative fuel for generator sets. This study recommends further testing with voltage and current variations to find the optimal configuration, as well as the use of a larger power source to increase the efficiency of HHO gas electrolysis.