Greening the Blue Annual Report 2025 - The environmental performance of the UN system

United Nations 3 hours ago

The 2025 edition of the Greening the Blue Annual Report presents the environmental performance of the UN system in 2024, covering operations of headquarters and field offices worldwide. 60 UN system entities have submitted performance data for this Report, corresponding to the activities performed by 312,084 members of personnel. The UN system has achieved notable reductions in emissions and environmental impacts in the past years, and since 2019. Notably: total GHG emissions dropped by 7.2% from 1.54 million tonnes of CO2 eq. in 2023 to 1.43 in 2024. A 29.7% reduction in total emissions was achieved in the 2019-2024 period; GHG emissions per capita have dropped by 4.2% from 2023 to 2024; a 29.5% reduction was achieved in the 2019-2024 period; per capita waste dropped by 5.74% from 2023 to 2024, a 36.7% reduction was achieved in the 2019-2024 period; per capita water use decreased by 12.5% from 2023 to 2024, a 19.2% reduction was achieved in the 2019-2024 period. The UN system entities remain committed to strengthening collaboration to adapt their ways of working to further reduce emissions while maintaining the positive impacts and legacy of the UN system to the world.
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layersDaily Sustainability Digest

Published about 1 hour ago



Recent developments signal that sustainable construction is entering a decisive phase where policy, technology and finance align to accelerate the decarbonising of the built environment. In the UK, Heidelberg Materials has initiated a low-carbon concrete trial in Greenwich using CarbonCure’s carbon mineralisation technology. This pilot advances low carbon design and highlights the growing industry focus on embodied carbon in materials and the carbon footprint of construction. Industrial-scale adoption of green construction methods could transform lifecycle assessment practices and strengthen whole life carbon assessment frameworks fundamental to achieving net zero whole life carbon outcomes.

Financing innovation is progressing in tandem with material advances. Barclays and Sustainable Ventures have launched a climate tech accelerator to scale low carbon construction materials and eco-friendly construction technologies. The programme supports sustainable building design and the commercialisation of circular construction strategies, signalling greater institutional interest in resource efficiency in construction and circular economy in construction models that limit waste throughout building lifecycle performance.

Across Europe, policy gaps continue to challenge energy-efficient buildings and the wider circular economy transition, yet progress in embodied carbon measurement tools and environmental product declarations (EPDs) is refining life cycle cost evaluation. These tools underpin sustainable building practices by integrating life cycle thinking in construction into both eco-design for buildings and sustainable material specification.

Institutional frameworks are tightening. The UN’s latest Greening the Blue report demonstrates that environmental sustainability in construction and within broader operations has become a core performance metric. Sustainable architecture aligned with BREEAM and the anticipated BREEAM v7 standards reinforces the shift toward carbon neutral construction, where low embodied carbon materials and green building products define next-generation sustainable design.

The sector’s foundations for environmental impact reduction are in place. The pressing task is converting pilot schemes into standardised models that deliver whole life carbon optimisation and demonstrable carbon footprint reduction across every stage of the sustainable construction process.

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