Solar Radiation Modification: No substitute for real climate action

United Nations 22 days 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 18 hours ago



The centre of gravity in sustainable construction has transitioned from intention to execution. The newly enacted Planning and Infrastructure Act establishes a Nature Restoration Fund to balance ecological impacts from development. This aligns environmental sustainability in construction with legal accountability, driving developers to integrate eco-design for buildings, sustainable building practices, and nature-positive design verified through Whole Life Carbon Assessment and lifecycle assessment. Firms must now quantify embodied carbon and demonstrate measurable reductions in the carbon footprint of construction, embedding life cycle thinking in construction at design stage to secure consent.

Infrastructure financing is reinforcing this shift. The National Wealth Fund’s guarantee for grid upgrades in northern Scotland will enable connection of renewables and electrification of heat and transport. These investments support low carbon design and net zero whole life carbon delivery, where contractors must combine engineering capability with green infrastructure stewardship and community trust. The challenge extends to the life cycle cost of energy networks, which must reflect resource efficiency in construction and alignment with the circular economy.

The Midlands Rail Hub Alliance formalises a model of integrated design and delivery for low-carbon transport infrastructure. Its approach exemplifies how decarbonising the built environment depends on sustainable building design principles applied to large-scale civil assets. Whole Life Carbon and embodied carbon in materials will govern procurement as clients adopt BREEAM v7 and environmental product declarations (EPDs) to measure the environmental impact of construction.

Private demand is converging with public policy. A long-term power purchase between a water utility and an onshore wind developer to supply 132 GWh annually demonstrates how major operators embed renewable building materials, circular construction strategies, and carbon footprint reduction within operations. The result is a maturing market for low carbon building solutions compliant with net zero carbon buildings and consistent building lifecycle performance.

Firms investing in sustainable material specification, low embodied carbon materials, and carbon neutral construction will gain advantage in a sector where carbon, capacity and consent define competitiveness. The transformation of planning, grid resilience and rail delivery represents the practical expression of sustainable design, positioning the UK as a testbed for eco-friendly construction and scalable net zero carbon strategies that underpin sustainable urban development.

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