Geothermal energy is an attractive alternative to fossil fuels because it is sustainable, supplied continuously, and has a minimal carbon footprint. Where subsurface temperatures are significantly warmer than surface temperatures, heat from the subsurface can be extracted for use on the earth's surface. In some areas, water carries heat to the surface in the form of thermal springs that support recreation and tourism. An unanswered question is whether larger scale geothermal development will lead to cooling of the recreational thermal springs or a reduction in flow rate, negatively impacting the industry. This work uses groundwater flow and heat transport modeling to evaluate the potential impact of geothermal energy production on hot springs. The modeled system is loosely based on the geologic and thermal regimes near Mt. Princeton in central Colorado, USA. The results show that the extraction of deep thermal water for geothermal energy production and the subsequent reinjection of cooled water has the potential to reduce the water temperature of surface springs.

Electrochemical cathodic reductions offer promising approaches for the green synthesis of value-added chemicals, including hydrogen peroxide (H2O2) and ammonia (NH3). Compared with traditional processes, the decentralized electro-synthesis enables on-site production with minimal carbon footprint. In these systems, cathodic catalysts critically govern the overall activity and selectivity of these multi-step reactions. Among the various reported catalysts, carbon-based metal-free electrocatalysts (C-MFECs) have attracted extensive attention, owing to their high conductivity, structural tunability, chemical stability, and eco-friendliness. Given the shared principles in material design and synthesis, this review systematically summarizes recent advances in C-MFECs for H2O2 and NH3 electro-synthesis via oxygen, nitrogen, and nitrate reduction reactions. Special focus is placed on the design strategies for C-MFECs, demonstrating universal understandings of non-metal doping and defect construction in these important reactions. In addition, innovations in electrode architecture and reactor configuration are highlighted to address challenges in achieving high current densities and efficient product separation. Finally, major challenges and perspectives specific to C-MFECs in oxygen, nitrogen, and nitrate electroreductions are highlighted to inform future advances in H2O2 and NH3 electro-synthesis.

The rapid transition toward cleaner energy requires microgrid models that are not only technically feasible but also economically and environmentally compelling for local contexts. This work develops and evaluates a hybrid renewable microgrid tailored for a residential building in Nazipur, Patnitala Thana, Naogaon District, Bangladesh. Using HOMER Pro (v3.14.2), the system integrates solar photovoltaic (PV), wind turbines (WT), an electrolyzer-hydrogen tank-fuel cell chain ("power-to-gas-to-power"), and a grid connection. The optimized design achieves a remarkably low cost of energy (COE) $0.0396/kWh and a net present cost (NPC) of $145,664 with minimal annual operating expenses ($1,100). The total carbon footprint is limited to 11,158kg/yr, reflecting a 95.8% reduction compared with conventional supply, while hydrogen is generated at $3.32/kg, reinforcing its role as a viable long-term storage medium. Beyond techno-economics, the study examines system stability through dynamic voltage and frequency response modelling in MATLAB, and explores resilience under uncertainty via sensitivity analysis of solar radiation, wind speed, hub height, temperature, and financial variables. The findings highlight that integrating hydrogen into renewable-based microgrids offers a scalable pathway for decarbonizing residential sectors in Bangladesh and similar developing regions. This research thus advances the discourse on hydrogen-augmented microgrids, underscoring their potential to bridge the gap between sustainability targets and local energy security. This study uniquely integrates a correlation-based sensitivity analysis with MATLAB dynamic validation to establish the reliability and feasibility of a hydrogen-augmented hybrid microgrid for residential applications.

Carbon costs on the Menu: The environmental and nutritional impact of Chinese dishes.

Quantifying the carbon footprint of canine breed-specific surgical care in a veterinary referral setting.

Comparing two Integrated Fixed-film Activated Sludge (IFAS) systems in view of the updated European Urban Wastewater Treatment Directive.

Eco-design of cellulose nanocrystals through ESCAPE method at lab-scale.

Recycling of calcareous shield tunnel muck and industrial solid waste for preparation of self-consolidating backfill slurry: Perspectives on fluidity, mechanical properties, and carbon footprints

Sustainability of PCM-lime mortars for heritage retrofitting: Carbon footprint and impact on energy demand across climates

Modeling livestock ecosystem services through carbon footprint

Assessing the environmental impact of wastewater leakage: A case study on grey water and carbon footprints in wastewater collection networks

Achieving SDGs in developing economies: A CS-ARDL analysis of the effects of industrial growth and foreign investment on carbon and ecological footprints

Carbon footprint calculation for power transmission and distribution equipment: A comprehensive review of methodologies, standards, and applications

Evaluation of carbon footprint effect in land consolidation for sustainable agricultural planning: A research on transportation and intra-parcel tractor maneuvers

Ensuring excellent indoor environments and ultra-low carbon footprint in a single-family house from design to operation

Accounting for commodity carbon footprints at the sub-national level: A case study of soybean exports from Brazil to China

Blockchain-enabled carbon footprint traceability in Thailand’s organic food sector: A quintuple helix innovation approach

Revisiting the carbon footprint of cryptocurrency trading: A granger causality approach

Life cycle carbon footprint and cost assessment of modern coal chemical industry coupled with carbon capture utilization and storage technology

Reducing carbon footprint in hydrothermal liquefaction through AI-optimized thermal recovery