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.
The built environment is undergoing a structural transformation driven by regulation, resilience and resource efficiency in construction. The UK’s post-Grenfell regulatory regime has intensified accountability across the sector, demanding transparent dutyholder responsibility and measurable performance in sustainable construction. The government’s plan to reform water governance, alongside stricter rules on leakage and pollution, elevates the importance of sustainable building design that prioritises water efficiency, life cycle cost and whole life carbon assessment. Developers face rising expectations to integrate eco-design for buildings that reduce run-off and demand rather than relying on infrastructure resilience alone.
Climate adaptation is now overt reality, with managed retreat shaping policy and finance. The demolition of coastal homes in Thorpeness demonstrates how location risk is being priced into valuations and insurance. This shift underscores the necessity of sustainable urban development based on lifecycle assessment, whole life carbon reduction and low carbon design to mitigate the environmental impact of construction. The resilience transition highlights that net zero whole life carbon and circular economy principles are not theoretical ambitions but essential for long-term asset viability.
Innovation on the supply side is reinforcing circular economy in construction. The University of Birmingham’s new rare-earth magnet recycling plant supports a circular supply chain for renewable building materials essential to low carbon building systems, from heat pumps to vertical transport. Yet progress on decarbonising materials such as cement and steel remains uneven, showing that embodied carbon in materials and process transparency must go beyond artificial intelligence and data analytics to achieve meaningful carbon footprint reduction. Cleaner production depends on applying life cycle thinking in construction and adopting low embodied carbon materials supported by environmental product declarations (EPDs).
Investment in flexible energy infrastructure, including platforms enabling energy-efficient buildings to interact with the grid, signals a future of decentralised, renewable power and carbon neutral construction. Policy signals remain inconsistent, but the imperative for environmental sustainability in construction is clear. Build fabric-first, electrify systems, embed circular construction strategies and specify green building materials validated through whole life carbon reporting. Those priorities define sustainable material specification, improve building lifecycle performance and align with BREEAM and BREEAM v7 standards, strengthening the economic case for decarbonising the built environment.
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