Assessing timber trade networks and supply chains in Brazil
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Global hake production and trade: Insights for food security and supply chain resilience
Hake, a key species in global seafood trade, substantially influences market dynamics and consumption patterns. This study delves into the global hake trade network (HGTN), spotlighting the roles and connections of key countries such as Spain, Namibia, Argentina, South Africa, the USA, and Italy, with Spain being the primary importer and countries like Namibia and South Africa notable exporters. Our findings unveil a multifaceted trade network, with Spain and Namibia as central nodes, and reveal growth in trade volume and value, signifying an evolving marketplace. The network’s susceptibility to economic, political, and ecological shifts underscores the necessity for resilient, adaptable trading practices to sustainably manage hake trade. Our findings emphasise the importance of managing resources and maintaining market balance to support global food security and reflect the dynamic seafood industry.
Rising greenhouse gas emissions embodied in the global bioeconomy supply chain
The bioeconomy is key to meeting climate targets. Here, we examine greenhouse gas emissions in the global bioeconomy supply chain (1995–2022) using advanced multi-regional input-output analysis and a global land-use change model. Considering agriculture, forestry, land use, and energy, we assess the carbon footprint of biomass production and examine its end-use by provisioning systems. The footprint increased by 3.3 Gt CO2-eq, with 80% driven by international trade, mainly beef and biochemicals (biofuels, bioplastics, rubber). Biochemicals showed the largest relative increase, doubling due to tropical land-use change (feedstock cultivation) and China’s energy-intensive processing. Food from retail contributes most to the total biomass carbon footprint, while food from restaurants and canteens account for >50% of carbon-footprint growth, with three times higher carbon intensity than retail. Our findings emphasize the need for sustainable sourcing strategies and that adopting renewables and halting land-use change could reduce the bioeconomy carbon footprint by almost 60%.
Low-carbon ammonia production is essential for resilient and sustainable agriculture
Ammonia-based synthetic nitrogen fertilizers (N fertilizers) are critical for global food security. However, their production, primarily dependent on fossil fuels, is energy- and carbon-intensive and vulnerable to supply chain disruptions, affecting 1.8 billion people reliant on either imported fertilizers or natural gas. Here we examine the global N-fertilizer supply chain and analyse context-specific trade-offs of low-carbon ammonia production pathways. Carbon capture and storage can reduce overall emissions by up to 70%, but still relies on natural gas. Electrolytic and biochemical processes minimize emissions but are 2–3 times more expensive and require 100–300 times more land and water than the business-as-usual production. Decentralized production has the potential to reduce transportation costs, emissions, reliance on imports and price volatility, increasing agricultural productivity in the global south, but requires policy support. Interdisciplinary approaches are essential to understand these trade-offs and find resilient ways to feed a growing population while minimizing climate impacts.
Navigating trade-offs on conservation: the use of participatory mapping in maritime spatial planning
Maritime spatial planning (MSP) has evolved to incorporate features like authoritative, participatory, ecosystem-based, integrated, future-oriented, and adaptive approaches. MSP seeks a balance between maritime activities and sustainable development within ecological limits, an ecosystem-based approach (EBA). A trade-off in the context of MSP refers to the compromise or exchange between different objectives, interests, or uses of marine resources and space. The aim of this paper is to provide methodological guidelines for applying a trade-off methodology for marine protected areas (MPAs) design within the MSP context. The guidelines have developed participatory-based trade-off scenarios to weigh the impacts of the multi-objective spatial and strategic management measures, using participatory mapping, providing a valuable framework for design of MSP and MPAs. The lessons learned and recommendations provided aim to guide future MSP endeavours, emphasising the importance of continuous improvement, innovation, and adaptation in the dynamic field of MSP for sustainable marine management and conservation.
Full recovery of brines at normal temperature with process-heat-supplied coupled air-carried evaporating separation (ACES) cycle
Conventional air-carried evaporating separation (ACES) technology, to achieve complete separation and recovery of water and salt in brine, tends to necessitate heating air above a critical temperature (typically>90 °C). In this paper, a novel concept of process-heat-supplied and an ACES cycle with this technique is proposed. A comprehensive thermodynamic analytical investigation is conducted. The results indicate that at heat source supply temperature Tsupply of only 45.17 °C, this novel unit is capable of achieving complete separation of water and salt from 5 wt% concentration brine. Meanwhile, thermodynamic mechanism analysis reveals that sufficient process-heat-supplied affords the fluid self-adaptive regulation on the driving potential of heat and mass transfer, thus circumventing traditional heat and mass transfer limitation. Additionally, a solar ACES system with process-heat-supplied incorporating heat pump is further proposed. For this system, theoretical evaporation rate for unit area of solar irradiation me-solar = 2.23 kg/(m2·h), integrated solar utilization efficiency ηi = 188%; while considering overall losses me-solar = 1.41 kg/(m2·h), ηi = 95.2%.
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