Australia's iconic Great Barrier Reef is the largest living structure on the planet and home to a vast array of species. But in recent years it has been hit by a series of devastating mass bleaching events, turning the vibrant colors of parts of the reef a bright white.
Across the world, corals are suffering a similar fate, with more than 80% of the ocean's reefs hit by an ongoing global bleaching event that began in 2023, due to record high marine temperatures. Bleaching can be deadly, as the corals are depleted of the algae that live inside them and act as a food source.
The effects can be catastrophic; while coral reefs occupy just 0.01% of the ocean floor, they support a quarter of all marine life, as well as providing people with food and livelihoods, and helping to reduce storm surge and protect against erosion.
If coral reefs are to be saved, efforts to curb ocean warming by reducing carbon emissions need to be stepped up, but scientists are also searching for other solutions to keep coral reefs alive in a warming world.
📸: Christine Roper; Tom Booth/CNN; Jake Crosby; John Edmondson
#CalltoEarth
Sustainable construction is moving from exemplar projects to market-wide system design, with clean steel emerging as a critical test for whole life carbon policy. A new study suggests the global shift to low-carbon steel could be achieved without raising consumer costs through a revenue-neutral policy model, strengthening the case for low embodied carbon materials in mainstream procurement.
For contractors, developers and public clients, the issue is no longer whether green building materials can perform, but how governments can de-risk low carbon construction materials, reduce the carbon footprint of construction and support net zero whole life carbon targets without shielding high-emission incumbents.
The UK retrofit agenda is becoming central to environmental sustainability in construction. The National Retrofit Hub’s call for a stronger framework comes as electricity and gas prices begin to decouple, improving the life cycle cost case for heat pumps, energy-efficient buildings and electrified homes.
Retrofit policy now needs consistent standards, skilled delivery capacity and consumer protection, backed by whole life carbon assessment, lifecycle assessment and better evidence on building lifecycle performance. Public support for requiring data centres to share waste heat with nearby homes signals a shift in sustainable urban development, treating rejected heat as green infrastructure rather than waste.
Climate adaptation is also reshaping sustainable building practices. GRAHAM’s appointment to deliver the Oxford Flood Alleviation Scheme highlights rising investment in resilience, while reports of roads melting in eastern England expose the environmental impact of construction decisions based on historic weather assumptions.
The built environment is being asked to cut embodied carbon in materials while improving durability against heat, flooding and infrastructure stress. The strongest response will combine sustainable building design, low carbon design, circular economy in construction, sustainable material specification, environmental product declarations (EPDs) and end-of-life reuse in construction. BREEAM, BREEAM v7 and other performance frameworks are likely to play a growing role as clients demand net zero carbon buildings, resource efficiency in construction and credible carbon footprint reduction across the full asset lifecycle.
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