The development of satellite mega-constellations promises substantial benefits but also exacerbates environmental risks, including primarily the proliferation of space debris, interference with astronomy, and effects on the atmosphere. This article explains the critical role of environmental impact assessments (EIAs) in ensuring the sustainable development of mega-constellations and argues that EIAs should be regarded as part of existing international space law. On the one hand, heightened environmental risks from space activities render EIAs increasingly relevant, if not indispensable, for implementing the obligations under Article IX of the Outer Space Treaty. On the other hand, while Article III of the Treaty enables the application of general international law on EIAs to outer space, its scope is constrained to activities that are likely to cause a significant adverse impact. The analysis also addresses the operationalization of EIAs with regard to mega-constellations by identifying the responsible state, assessing the significance of environmental impacts, articulating minimum standards, and developing appropriate mechanisms.

Early design decisions are central to many circular economy approaches and largely determine environmental impacts. Yet LCA practice is often fragmented and difficult to integrate into engineering development processes. This paper proposes an MBSE approach that represents and computes LCA-based (LCIA) impact indicators within SysML models using reusable, configurable model elements and automated import of characterization factors. A proof-of-concept implementation demonstrates technical feasibility, illustrates process integration, and discusses limitations and future work.

This article examines how the identification and assessment (I&A) of adverse environmental impacts (AEI) within corporate value-chain due diligence (VCDD) norms under the Guidelines of the Organisation for Economic Co-operation and Development (OECD) is normatively designed, and how it can be distinguished from similar legal requirements that already bind corporations to perform environmental impact assessments (EIAs). Through a systematic analysis of specific instances of National Contact Points (NCPs), the article investigates how these expectations have been interpreted and applied in practice in environmental disputes raising claims concerning the I&A due diligence stage. The findings highlight inconsistencies in how NCPs handle such claims and showcase the interpretative divergences concerning the ways in which they perceive the interplay between these VCDD expectations and other host-state legal requirements that bind corporations to conduct assessments of environmental impacts. Based on the analysis, the article then reflects on the specificities of I&A expectations, as well as on avenues for future research. The research argues that VCDD requirements for corporations to identify and assess adverse environmental impacts should be interpreted as setting independent normative commands that warrant a specific compliance assessment. The article concludes by issuing recommendations concerning the ways in which I&A expectations should be interpreted in practice to avoid blurring the boundaries between two distinct layers of home- and host-state regulation.

The intersection between climate change, energy transitions and the circular economy highlight the opportunities and contestations between different efforts to mitigate the complex environmental challenges we face. The energy we use to extract, manufacture, remanufacture and dispose of our material world is a major contributor to diverse climate impacts, an issue which is compounded by linear economic models that necessitate eternal extraction. Yet many of the materials we depend upon are exceptionally efficient at enabling functions that facilitate social, economic and environmental sustainability. This dichotomy is arguably most acutely debated in the world of polymers and plastics. While recycling has long been touted as a solution space for plastic sustainability, a plethora of chemists, biologists and engineers have more recently expanded global research in this direction. The resultant proliferation of terms like ‘up-’ or ‘down-’ or ‘re-’cycling that frame these opportunities are often poorly defined as value propositions. The danger lies in directions acting as a barrier to circularity, or even greenwashing transformations. Herein, we explore the value judgements and verifications of this directionality, investigate how we can better define these value judgements from a systems sustainability perspective and evaluate different proposed approaches and their barriers across different supply chains and sectors.

Current scholarship often views international environmental law (IEL) through a crisis or ambition lens. The “crisis lens” apologizes for the limitations of doctrinal methods in resolving disputes. The “ambition lens” seeks to align IEL with a planetary perspective but is criticized for utopianism. We offer a social-systems-theoretical alternative. IEL’s ability to learn and adapt to social change also depends on sustaining law’s function of stabilizing expectations. This constitutes the core of Luhmann’s theory of operative closure. We devise three hypotheses to reconstruct IEL’s operative closure and apply them to the South China Sea. Hypothesis 1: Environmental impact assessment norms address the problem of contingency management. Hypothesis 2: Due diligence norms address the problem of confidence maintenance. Hypothesis 3: Cooperation norms address the problem of trust retention. Our analysis shows that reconstructing IEL’s operative closure reveals its societal responsiveness. This presents a new critical lens for observing IEL’s social phenomena.

This study presents a novel approach using machine learning, specifically Random Forest modelling, to create a sensitivity map that addresses the conflict between offshore wind farms (OWFs) and wintering waterbirds in the southern Baltic Sea. This region is crucial or of great importance for wintering species such as the Long-tailed Duck Clangula hyemalis and Velvet Scoter Melanitta fusca. In 2020, the southern and central Baltic Sea hosted approximately one million wintering birds, including over 560,000 Long-tailed Ducks (35% of the species’ biogeographical population), 230,000 Velvet Scoters (41% of the global population), and 4,500 Black Guillemot Cepphus grylle (8% of the Baltic population). Within the Polish Exclusive Economic Zone (PEEZ), 21 wind farms are planned, totalling a capacity of 17.6 GW with an estimated 1,164 turbines. To assess potential risks, a Normalised Overlap Index (NOI) was calculated for each wind farm, quantifying the level of potential threat to wintering birds. High conflict zones, such as the Southern Middle Bank and Pomeranian Bay, were identified, where wind farms significantly overlap with areas of high bird density. Although the wind farms do not intersect with Natura 2000 sites, partial overlaps with Important Bird Areas (IBAs) were noted. The method developed in this study not only addresses the challenges in the Baltic Sea but also offers potential applications in other marine and terrestrial environments. This framework provides a novel tool for evaluating and mitigating the impacts of renewable energy development on wildlife, contributing to the sustainable expansion of green energy solutions globally.

Reducing plastic pollution of the Antarctic environment is a priority for the Antarctic Treaty Consultative Meeting (ATCM) and Council of Managers of National Antarctic Programs (COMNAP). Polyester flags mounted on bamboo poles are commonly used by governmental and tourism operators as markers of safe travel routes, scientific equipment and depots in snow-covered areas. Polar environmental conditions can rapidly degrade polyester flags, resulting in plastic release into the environment. This study aimed to quantify the degree of polyester flag degradation and investigate alternative, less polluting flag types. Pre-weighed flags of four types - standard polyester, hemmed polyester, organic cotton canvas and Ventile${}^\circledR $ (a tight-weave cotton fabric) - were deployed close to Rothera Research Station, Antarctic Peninsula, from February 2023 to January 2024, after which any changes in weight were recorded. On average, each standard polyester flag lost 25.5% (± standard error (SE) 0.8) of its weight, equating to the release of 8.3 g of plastic into the environment; however, hemming the flag reduced this loss to 13.3% (± SE 3.7). Ventile${}^\circledR $ was almost as durable as unhemmed polyester (loss of 26.9% (± SE 3.8)), whereas cotton canvas was the least durable (loss of 44.1% (± SE 4.3)). Switching from standard polyester to Ventile${}^\circledR $ flags would prevent the annual release of > 8.3 kg of plastic into the environment around Rothera Research Station, and potentially ~300 kg across all Antarctic operator activities. This is a conservative estimate compared to a potential additional 800 kg of plastic that could be lost to the environment due a high proportion of deployed flags not being recovered. Further investigations to identify cost-effective sustainable flag materials are recommended to comply with ATCM and COMNAP recommendations concerning plastic management in Antarctica.

The need to address and reverse global biodiversity decline is imperative across all of society including the practices of mine closure planning. Nature Positive is the latest global biodiversity-focused initiative which calls for at least 30% of biodiversity to be enhanced through effective restoration relative to the 2020 baseline. This paper conceptualizes and explains what is necessary in mine closure planning and implementation to meaningfully contribute to this and other nature-positive goals, with some illustrative examples. Issues considered include application of the mitigation hierarchy, rehabilitation in mining and the time lag challenge for restoring biodiversity, biodiversity offsetting, conserving nature while meeting social needs, consideration of the indirect and induced impacts of mining, managing tradeoffs in decision-making processes and ensuring that nature positive benefits are long-lasting. The implications for mine closure planning are identified for each of these considerations. The paper ends with a conceptual framework that maps the nature positive challenges in relation to mine closure planning undertakings and call for action by practitioners and researchers alike to advance progress and practices.

This article analyzes the application of environmental impact assessment as a tool for climate change mitigation from a global comparative perspective. It firstly confirms that, despite persistent resistance in a few jurisdictions, climate effect assessment is now widely applied on a global scale. Yet the article also shows that this practice has faced recurrent practical and conceptual issues, in particular, concerning the determination of the significance of a project’s climate effect and the assessment of indirect effects. Lastly, this article assesses how states have addressed these issues and identifies good practices. In doing so, the article illustrates the potential of functionalist comparative analysis in advancing our understanding of climate law and suggesting policy-relevant conclusions.