Solar Radiation Modification: No substitute for real climate action

United Nations 1 hour ago

Solar Radiation Modification (SRM) technologies—such as Stratospheric Aerosol Injection (SAI) and Marine Cloud Brightening (MCB) are speculative concepts that aim to temporarily lower global temperatures by reflecting solar radiation back into space. These approaches do not reduce greenhouse gas concentrations—the root cause of climate change—nor do they address its impacts. These technologies also represent different levels of readiness and have been subject to a great deal of political and scientific controversy. Sometimes cast as an emergency tool, SRM remains poorly understood and fraught with uncertainties and risks and is no substitute for mitigation or stronger adaptation. For now, SRM is largely confined to models, simulations and theory. The unintended consequences include disruptions to climate patterns, biodiversity and the ozone layer, with regional hydrological impacts modelled as being uneven. This Issues Note provides a review of the latest literature on specific topics that are of relevance to UNEP’s mandate. It also presents a set of agreed approaches and recommendations regarding UNEP’s communication of the subject matter. It is meant to ensure consistency in messaging across the organization on this topic.
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layersDaily Sustainability Digest

Published about 8 hours ago



The sustainable construction industry has entered a new phase of maturity, defined by its focus on decarbonising key materials and embedding whole life carbon assessment into sustainable building design. A global certification scheme for architectural glass endorsed by major manufacturers such as JLR and Volvo marks a decisive advance in addressing embodied carbon in materials often excluded from formal lifecycle assessment frameworks. By formalising transparent environmental product declarations (EPDs) and requiring full supply-chain traceability, the initiative elevates glass to equal footing with concrete and steel in sustainable material specification. This positions the sector for more rigorous whole life carbon evaluation and enhanced life cycle thinking in construction, supporting the broader goal of decarbonising the built environment.

The UK government-backed GB Energy has launched its first national strategy, aiming to deliver clean power for ten million homes through 15GW of new capacity. Channelled into regions with deep industrial heritage, the plan unites green infrastructure investment with skilled workforce deployment to accelerate a net zero carbon energy transition. The integration of these assets will advance low carbon design principles across future development and construction projects while linking renewable generation to energy-efficient buildings and low-impact construction standards aligned with BREEAM v7.

A landmark power purchase agreement between McDonald’s and a Scottish wind energy project further demonstrates the mainstreaming of renewable building materials and circular economy in construction financing. The ability of large corporate offtakers to secure predictable output from dedicated renewable assets signals increased confidence in carbon neutral construction and stable life cycle cost planning, reinforcing the commercial feasibility of net zero whole life carbon pathways.

Concurrent research into the UK bioeconomy forecasting annual potential exceeding £200 billion highlights the central role of eco-design for buildings and green building materials in advancing environmental sustainability in construction. Expansion of this sector will depend on long-term policy certainty, enabling scalable solutions in low carbon construction materials and resource efficiency in construction that improve building lifecycle performance and extend end-of-life reuse in construction.

Taken together, these developments represent a tangible evolution from ambition to execution, positioning sustainable construction as a foundation for sustainable urban development, resilient investment, and measurable carbon footprint reduction across every stage of the built environment’s value chain.

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