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Hotel certifications have become increasingly vital in promoting sustainability within the hospitality industry, providing frameworks that guide hotels toward reducing their environmental footprint, enhancing operational efficiency, and gaining a competitive edge in the marketplace. This review explores the development, types, and impact of hotel certifications, with a focus on prominent schemes, such as LEED, Green Key, and EarthCheck. Through an analysis of case studies from globally recognized hotels, we highlight how certifications contribute to significant reductions in energy and water use, improved waste management, and enhanced biodiversity protection, while also delivering economic benefits through cost savings and increased guest loyalty. Our paper also examines consumer perceptions of certifications and their willingness to pay (WTP) for certified hotels. The findings suggest that eco-conscious travelers, particularly younger generations, are willing to pay a premium for hotels that demonstrate a commitment to sustainability; however, consumer awareness of certification schemes remains limited. The barriers to adopting certifications, such as high initial costs, resource limitations, and management resistance, are also discussed, along with the challenges posed by greenwashing and the proliferation of certification schemes. Looking to the future, this review identifies key trends that will shape the evolution of hotel certifications, including increased transparency, the integration of smart technologies, the expanding role of social responsibility, and their alignment with global sustainability goals, such as the United Nations Sustainable Development Goals (SDGs). Hotel certifications are not only crucial for environmental sustainability, but also serve as a powerful tool for enhancing the economic viability of hotels in an increasingly competitive and sustainability-driven market. Full article

With the global advancement of sustainable development concepts, the logistics industry is confronting significant environmental challenges, making green innovation a critical driver for industrial transformation and upgrading. However, during the green innovation process in logistics service supply chains, the differing roles of logistics service integrators and logistics service providers, combined with high costs and uncertain returns, hinder coordination efficiency. Therefore, it is imperative to enhance the coordination of supply chain contracts. Nevertheless, existing literature provides limited insights into the coordination capacities and impacts of different contracts on green innovation in logistics service supply chains. This study develops a Stackelberg game model where the logistics service integrator acts as the leader and logistics service providers serve as followers, examining the effects of cost-sharing contracts, revenue-sharing contracts, and hybrid cost-sharing and revenue-sharing contracts on supply chain coordination. Numerical simulations are employed to validate the findings. The results indicate that hybrid contracts provide the strongest incentives for green innovation among supply chain participants, whereas cost-sharing contracts offer relatively weaker incentives for integrators’ green design innovation. In addition, revenue-sharing contracts and hybrid contracts were effective in reducing the wholesale price of green logistics services, although all three contract types resulted in higher market prices. Finally, all three contract types achieve Pareto improvements in the supply chain, with hybrid contracts maximizing the total profit of the supply chain. This study not only elucidates the incentive mechanisms and relative advantages of different contracts in supply chain collaboration, but also offers critical theoretical and practical insights for designing contracts to foster green innovation in the logistics sector. Full article

Concerns about environmental protection and sustainable consumption increased among Generation Z, as a consequence of more perceived risks emerging in the context of climate change and depletion of natural resources. The aim of the present research was to identify the main factors that influence the intention to purchase eco-products among the young generation. Quantitative marketing research was carried out on a sample of 269 Gen Z. The research results proved that purchasing intention for eco-products is strongly influenced by the perceived quality of environmentally friendly products, consumer consciousness about eco-products, perceived value of green products, and consumer trust in ecological products. Lower influences were recorded in terms of perceived price and perceived availability of eco-products, with improved total effects when considering the mediating role of eco-trust. Consequently, the provision of eco-products could lead to image benefits for organizations. Full article

The carbon emissions trading (CET) policy is a crucial market-based environmental regulatory policy for managing corporate carbon emissions, thereby assisting China in achieving its carbon peak and carbon neutrality goals. This study examines whether such a policy can boost corporate environmental performance. Based on China’s CET pilot as a quasi-natural experiment, this paper employs the difference-in-differences method and difference-in-difference-in-differences method to analyze the data of listed companies in the pilot regions from 2010 to 2020. Findings show that the policy of CET has a significant positive influence on firms’ environmental performance. Notably, while high-pollution companies benefit substantially, the effect is relatively weaker compared to others. Mechanism analysis shows that the policy drives improvements through enhanced environmental management and green innovation, and government environmental subsidies promote the effect of CET on environmental performance. In addition, the impact is more pronounced in state-owned, large-scale, and power industry companies; companies in regions with strong environmental regulations; and with high executive green awareness. These findings provide some insights for refining China’s CET framework and enhancing environmental outcomes. Full article

Using eye-tracking technology, the proposed study investigates how customers visually evaluate apples varieties and apple defects and how these evaluations affect their purchasing decisions. Three aspects were examined in this study: apple variety, defect severity, and cultural background. Idared, Golden Delicious Yellow, and Golden Delicious Green apple varieties with increasing degrees of bruising were shown to Chinese and Hungarian participants. The findings show that apple variety had no significant effect on gaze patterns, whereas cultural background had a considerable impact on visual attention measures. The most important element in grabbing and retaining customer attention was the severity of the defect, which was measured by area. The “Threshold of Rejection”, which characterizes consumer tolerance for Apple defects, is introduced in the study. Furthermore, a polynomial regression model was created to predict the probability of repurchasing an apple depending on its visual quality (level of bruising). These results provide useful information for marketing plans, quality assurance, and comprehending customer behavior in the fresh produce sector. Full article

The formation and development of new quality productivity of agriculture can effectively promote agricultural sustainability and modernization. In order to explore the multiple paths of the formation of new quality productivity of agriculture, using the panel data of 30 provincial levels in China from 2012 to 2021, based on the “technology-organization-environment” framework and dynamic QCA method, this paper explores how seven factors such as agricultural technology innovation, digital infrastructure, innovation policy support, the formation of e-commerce industry, marketization level, green finance, and rural culture modernization interact to promote the formation of new quality productivity of agriculture. The findings reveal that none of the above seven factors can promote the formation of new quality productivity of agriculture, and agricultural technological innovation and digital infrastructure are becoming more and more important to the formation of new quality productivity of agriculture over time. The high new quality productivity of agriculture formation models can be categorized into four types: TOE empowers new business model development-driven, government–market–culture triple-driven, market-oriented efficient transformation of technological achievements-driven, and deep integration of agricultural technological innovation and emerging agricultural business models-driven. The configurational results exhibit significant regional effects, with diverse pathways for the formation of new quality productivity of agriculture across different provinces. Full article

Using data from 188 traditional energy companies listed on China’s A-share market from 2012 to 2023, this study adopts the double-difference method to assess the changes in the green investment of traditional energy companies before and after the implementation of environmental regulation policies in depth and further explores the actual effects and potential risks of green investment on the green transformation of traditional energy companies. This study shows that the environmental regulation policies significantly increased the green investment of traditional energy enterprises, but this increase did not effectively promote the overall green transformation of the enterprises; rather, they became more focused on meeting the current compliance requirements while ignoring the fundamental green technological innovation and production mode change. Further analysis reveals that, as environmental standards continue to rise, the increasing green investment expenditure of traditional energy companies for meeting the standards will continue to outpace the growth in capital inflows of traditional energy companies, resulting in a threat to the financial soundness of the companies in the short term and a significant increase in financial pressure. In the long run, the lack of sustained and stable external financial support for a long period of time will not only constrain the green transformation process of enterprises but may also pose a serious threat to the survival foundation of enterprises and even lead to the elimination of enterprises in fierce market competition. Full article

This paper examines the influence of green innovation on the sustainable development performance of Chinese companies listed on the Shanghai and Shenzhen A-shares market between 2010 and 2021. Utilizing manually collected green innovation patent data from the National Intellectual Property Administration, this paper finds that green innovation can enhance corporate sustainable development performance by improving the corporation’s reputation and increasing resource utilization efficiency within metropolitan areas. Heterogeneity analyses show that the impact of green innovation on sustainable development performance is more pronounced when the urban commercial credit environment is better, following the enactment of the new Environmental Protection Law, and during the implementation of digital transformation processes in cities. This paper enriches the research related to the economic consequences of green innovation and the influencing factors of sustainable development performance, offering theoretical support for policy refinement by regulatory authorities and the optimization of investment decisions by investors. Full article

Pigment production has a substantial negative impact on the environment, since mining for natural pigments causes ecosystem degradation, while synthetic pigments, derived from petrochemicals, generate toxic by-products that accumulate and persist in aquatic systems due to their resistance to biodegradation. Despite these challenges, pigments remain essential across numerous industries, including the cosmetic, textile, food, automotive, paints and coatings, plastics, and packaging industries. In response to growing consumer demand for sustainable options, there is increasing interest in eco-friendly alternatives, particularly bio-based pigments derived from algae, fungi, and actinomycetes. This shift is largely driven by consumer demand for sustainable options. For bio-pigments, actinomycetes, particularly from the Streptomyces genus, have emerged as a promising green source, aligning with global sustainability goals due to their renewability and biodegradability. Scale-up of production and yield optimization challenges have been circumvented with the aid of biotechnology advancements, including genetic engineering and innovative fermentation and extraction methods, which have enhanced these bio-pigments’ viability and cost-competitiveness. Actinomycete-derived pigments have successfully transitioned from laboratory research to commercialization, showcasing their potential as sustainable and eco-friendly alternatives to synthetic dyes. With the global pigment market valued at approximately USD 24.28 billion in 2023, which is projected to reach USD 36.58 billion by 2030, the economic potential for actinomycete pigments is extensive. This review explores the environmental advantages of actinomycete pigments, their role in modern industry, and the regulatory and commercialization challenges they face, highlighting the importance of these pigments as promising solutions to reduce our reliance on conventional toxic pigments. The successful commercialization of actinomycete pigments can drive an industry-wide transition to environmentally responsible alternatives, offering substantial benefits for human health, safety, and environmental sustainability. Full article

Venture capital is vital for developing capital markets and the low-carbon transformation of the economy. We used panel data from 27 cities in the Yangtze River Delta urban agglomeration from 2011 to 2022 to investigate how the scale and structure of venture capital influence the intensity of urban carbon emissions using spatial econometric models. We show that an increase in the scale of venture capital can inhibit the increase in the intensity of urban carbon emissions, and the effect is more pronounced in cities with higher pollution and better geographical location. Heterogeneity exists in the carbon-reduction effects of venture capital across industries. The direct carbon reduction effect of venture capital flowing to mid- and low-end industries is stronger and more prominent in cities with higher pollution and less favourable geographical locations. The long-term carbon reduction effect of venture capital flowing to high-end industries is stronger. The mediating effect of technological innovation is prominent, while the effect of industrial structure upgrade is not prominent. The enterprises’ willingness and ability to engage in green transformation acts as a positive moderator, whereas the positive moderating effect of the government in that respect is insufficient. This study clarifies the mechanism of venture capital on urban carbon emissions and offers valuable insights for optimising the structure and system of venture capital. Full article

As an important indicator of the level of urban economic development and the quality of the residents’ lives, housing prices are affected by various factors, such as the spatial distribution of the housing market, the housing characteristics of neighborhoods, and the location conditions. This paper summarizes the spatial distribution of housing prices in Qingdao using GIS, analyzing spatial distribution characteristics, and combines these with the Geographically Weighted Regression (GWR) model to explore the influence of various factors, such as community attributes, location, transportation, and peripheral facilities on residential prices. The results show that from 2003 to 2023, residential housing prices in Qingdao exhibited a significant, continuous upward trend, with rapid growth in the early period and more stable growth in the later period; the spatial structure of residential prices evolved from a “single core” in Shinan District to a “double core + fan” structure involving both Shinan and Laoshan Districts, eventually forming a “double core + fan + mosaic” spatial layout; the green environment, congestion, leisure facilities, service management, and other community factors not only reflect the economic strengths and lifestyles of the residents, but also serve as key drivers of residential price differentiation. Full article

Hydrogen (H2) offers a green medium for storing the excess from renewables production instead of dumping it, thus being crucial to decarbonisation efforts. Hydrogen also offers a storage medium for the grid’s cheap electricity to be used during grid peak demand or grid power cutoffs. Funded by the Scottish Government’s Emerging Energy Technologies, this paper presents the design and performance analysis of a hydrogen uninterruptible power supply (H2GEN) for Cygnas Solutions Ltd., which is intended to enable continuity of supply in the residential sector while eradicating the need for environmentally and health risky lead–acid batteries and diesel generator backup. This paper presents the design, optimal sizing and analysis of two H2Gen architectures, one powered by the grid alone and the other powered by both the grid and a renewable (PV) source. By developing a model of each architecture in the HOMER space and using residential location weather data, the home yearly load–demand profile, and the grid yearly power outages profile in the developed models, the optimal sizing of each H2Gen design was realised by minimising the costs while ensuring the H2Gen meets the home power demand during grid outages To enable HOMER to optimise its selection, the sizes, technical specifications and costs of all the market-available H2GEN components were added in the HOMER search space. Moreover, the developed models were also used in assessing the sensitivity of the simulation outputs to several changes in the modelled system design and settings. Using a residential home with frequent power outages in New Delhi, India as a case study, it was found that the optimal sizing of H2Gen Architecture 1 is comprised of a 2 kW electrolyser, a 0.2 kg type-I tank, and a 2 kW water-cooled fuel cell directly connected to the AC bus, offering an operational lifetime of 14.3 years. It was also found that the optimal sizing of Architecture 2 is comprised of a 1 kV PV utilised with the same 2 kW electrolyser, 0.2 kg type-I tank and 2 kW water-cooled fuel cell connected to the AC bus. While the second design was found to have a higher capital cost due to the added PV, it offered a more cost-effective and environmentally friendly architecture, which contributes to the ongoing energy transition. This paper further investigated the capacity expansion of each H2GEN architecture to meet higher load demands or increased grid power outages. From the analysis of the simulation results, it has been concluded that the most feasible and cost-effective H2GEN system expansion for meeting increased power demands or increased grid outages can be realised by using the developed models for optimally sizing the expanded H2Gen on a case-by-case basis because the increase in these profiles is highly time-dependent (for example, an increased load demand or increased grid outage in the morning can be met by the PV, while in the evening, it must be met by the H2GEN). Finally, this paper investigated the impact of other environmental variables, such as the temperature and relative humidity, on the H2GEN’s performance and provided further insights into increasing the overall system efficiency and cost benefit through utilising the H2GEN’s exhaust heat in the home space for heating/cooling and selling the electrolyser exhaust’s O₂ as a commodity. Full article

Cross-region and cross-industry cooperation has become a key driver of industrial transformation. Advanced manufacturing is boosting the modern service industry and fostering innovation and development, while the modern service industry is promoting advanced manufacturing and stimulating the market demand. The convergence of advanced manufacturing and modern services (CAMMS) is a key driver of environmental innovation in China’s modern economy. This study explores the impact of CAMMS on green innovation efficiency and its spatial correlations. Employing a two-way fixed-effect model, along with the mediating-effect model and the spatial Durbin model (SDM), we analyze Chinese provincial panel data from 2006 to 2021 to explore the effects of CAMMS on green innovation efficiency and its spatial spillover effects. Our findings reveal the following: (1) CAMMS significantly enhances green innovation efficiency. (2) Optimizing industrial structure and improving factor allocation are the primary mechanisms through which CAMMS promotes green innovation efficiency. (3) The CAMMS mechanism positively influences spatial spillover effects on green innovation efficiency, with these effects becoming more pronounced in the eastern region and after 2011. (4) Finally, due to increasing information transmission costs and local protectionism, the “spillover effect” of CAMMS on green innovation efficiency has geographical boundaries. This study contributes to the literature by providing valuable insights for future practices in CAMMS and green innovation strategies in China. This also provides strong support for the local economy to achieve green transformation and sustainable development. Full article

The present work demonstrates a comparative study of hydrogen fuel cells and combustion aircraft to investigate the potential of fuel cells as a visionary propulsion system for radically more sustainable medium- to long-range commercial aircraft. The study, which considered future airframe and propulsion technologies under the Se2A project, was conducted to quantify potential emissions and costs associated with such aircraft and to determine the benefits and drawbacks of each energy system option for different market segments. Future technologies considered in the present work include laminar flow control, active load alleviation, new materials and structures, ultra-high bypass ratio turbofan engines, more efficient thermal management systems, and superconducting electric motors. A multi-fidelity initial sizing framework with coupled constraint and mission analysis blocks was used for parametric airplane sizing and calculations of all necessary characteristics. Analyses performed for three reference aircraft of different sizes and ranges concluded that fuel-cell aircraft could have operating cost increases in the order of 30% compared to hydrogen combustion configurations and were caused by substantial weight and fuel burn increases. In-flight changes in emissions of fuel cell configurations at high altitudes were progressively reduced from medium-range to long-range segments from being similar to hydrogen combustion for medium-range to 24% for large long-range aircraft, although fuel cell aircraft consume 22–30% more fuel than combustion aircraft. Results demonstrate a positive environmental impact of fuel cell propulsion for long-range applications, the possibilities of being a more emission-universal solution, if desired optimistic technology performance metrics are satisfied. The study also demonstrates progressively increasing technology requirements for larger aircraft, making the long-range application’s feasibility more challenging. Therefore, substantial development of fuel cell technologies for long-range aircraft is imperative. The article also emphasizes the importance of airframe and propulsion technologies and the necessity of green hydrogen production to achieve desired emissions. Full article

Market-based environmental regulations play a crucial role in promoting local carbon emissions reduction under the context of achieving “carbon peaking and carbon neutrality goals” goals. Previous studies have mainly focused on the emission reduction effects of single policy instruments, lacking systematic measurement of market-based environmental regulation. Based on panel data from Chinese prefecture-level cities during 2011–2020, this study constructs a market-based environmental regulation index using a policy text analysis method to empirically examine its impact on carbon emission intensity and the underlying mechanisms. The research findings are as follows: (1) The impact of market-based environmental regulations on carbon emission intensity shows an inverted U-shaped relationship, indicating increased carbon emissions in the short term but favorable carbon reduction in the long term. (2) Mechanism tests reveal that market-based environmental regulations primarily influence carbon emission intensity through enterprise green innovation, showing an inverted U-shaped relationship, suggesting that such regulations may suppress enterprise innovation vitality in the short term but effectively promote green innovation in the long term. (3) The carbon reduction effect of market-based environmental regulations varies significantly across regions with different official characteristics. This study provides an important theoretical basis and policy implications for improving market-based environmental regulation policy design and enhancing carbon reduction effectiveness. Full article