Female leatherback turtles are among the world's most intrepid creatures, making journeys as far as 10,000 miles after nesting to find food in far-away seas. They've been known to set off from tropical Southeast Asia up to the cold waters of Alaska, where jellyfish are abundant.
But travelling such a long way means encountering threats that can be fatal: fishing nets intended for other species, poachers, pollution and waters warmed by the climate crisis, which force the turtles to travel even further to find their prey.
These turtles are just one of hundreds of migratory species — those that make remarkable journeys each year across land, rivers and oceans — that are facing extinction because of human interference, according to a landmark UN agency report.
Of the 1,189 creatures listed by the Convention on the Conservation of Migratory Species of Wild Animals, or CMS, more than one in five are threatened.
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📸: Chaideer Mahyuddin/AFP/Getty Images
The strongest signal for sustainable construction is a shift from broad claims of sustainability towards measurable whole life carbon, circular economy delivery and climate resilience. In the UK schools estate, offsite construction is being positioned as a practical route to low carbon design, with standardised components, controlled factory production and buildings designed for disassembly reducing embodied carbon and supporting end-of-life reuse in construction. For public-sector clients under pressure to deliver quickly, whole life carbon assessment, lifecycle assessment and life cycle cost analysis are becoming central to procurement, sustainable building design and building lifecycle performance.
Circular economy in construction is gaining momentum through plans for a wind-turbine recycling facility in the Scottish Highlands. The project reflects a maturing renewable energy supply chain and a growing requirement to address the embodied carbon in materials after first use. Decommissioned blades and composite components could become feedstock for green building products, low carbon construction materials and future green infrastructure, cutting landfill dependence and improving resource efficiency in construction.
Materials research is also moving beyond waste management towards performance-led sustainable material specification. Work converting waste plastics, including packaging and consumer goods, into polymer networks capable of harvesting water from dry air suggests new possibilities for eco-design for buildings in hotter, water-stressed regions. If developed at scale, such innovation could contribute to low-impact construction, carbon footprint reduction and the wider use of green building materials with stronger environmental product declarations (EPDs).
The main constraint is delivery capacity. Labour shortages threaten construction programmes at the same time that net zero carbon buildings, net zero whole life carbon targets and BREEAM v7 requirements demand more precise design, assembly, refurbishment and materials recovery. Environmental sustainability in construction now depends on skills, data and accountability as much as ambition. Decarbonising the built environment will require clients, regulators and contractors to treat sustainable design, circular construction strategies and low embodied carbon materials as core requirements, not optional enhancements.
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