Scorching temperatures and a long, dry summer have given locals and tourists alike a rare opportunity to see the remains of a 2,000-year-old bridge that once spanned the Tiber river that weaves through the center of Rome.
The flow of the Tiber, which is fed from tributaries from the northern Apennine Mountains, has fallen below 80 cubic meters a second, half the national average for this time of year, according to Rome's civil protection coordinator, Giovanni Giganti. "We are facing a major water crisis. And it is a crisis that is also due to the fact that this winter we did have quite abundant rainfall, but then the dry periods … were quite long," Giganti told the Associated Press.
Nero's Bridge (Pons Neronianus) was thought to have been built as a triumphal monument by the Emperor Caligula around 39 AD. But it is referred to as Nero's Bridge because Nero, Caligula's nephew, renamed a number of ancient structures after himself during his rule from 54 to 68 AD, according to historical accounts.
The bridge originally connected the ancient Campus Martius area, which now houses the Spanish Steps, the Piazza del Popolo and the posh shopping streets around Via Condotti, to the Circus of Nero stadium where St. Peter was martyred and upon which St. Peter's Basilica and the Vatican City now stand.
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📸: Andreas Solaro/AFP/Getty Images
Sustainable construction is shifting beyond carbon accounting towards resilience, circular economy delivery and measurable building lifecycle performance. UN warnings on displacement across South Asia from sea-level rise, drought and flooding reinforce the urgency of sustainable building design that treats adaptation as a core requirement, not a specialist add-on. UK fire services reporting escalating wildfire and flood risks point to the same imperative for energy-efficient buildings, low carbon design and sustainable urban development that can withstand climate volatility while reducing the carbon footprint of construction.
Material innovation is gaining momentum where waste streams become assets. Plans for a wind-turbine recycling facility in Inverness signal progress in circular economy in construction, giving physical capacity to end-of-life reuse in construction and resource efficiency in construction. Research converting plastic waste, including old CDs and packaging, into polymer networks able to absorb water from air shows how green building materials and low carbon construction materials could support moisture management, water harvesting and eco-design for buildings. The science remains early stage, but it strengthens the case for sustainable material specification, low embodied carbon materials and circular construction strategies.
Policy is becoming the decisive constraint. UK recycling rules that limit the repurposing of difficult plastic films expose a gap between environmental sustainability in construction and waste regulation designed around disposal rather than innovation.
For developers, contractors and product manufacturers, whole life carbon, embodied carbon and life cycle cost are now strategic measures of resilience, not compliance exercises.
Whole life carbon assessment, lifecycle assessment, environmental product declarations (EPDs), BREEAM and BREEAM v7 are set to shape procurement decisions as clients demand evidence of net zero carbon buildings, net zero whole life carbon and credible carbon footprint reduction.
The competitive edge in green construction will come from proving that buildings use fewer virgin resources, reduce embodied carbon in materials, perform under climate stress and deliver lower whole-life risk. Sustainable building practices, renewable building materials, green infrastructure and low-impact construction are moving from aspiration to commercial necessity as the weather, regulation and investment markets put greater pressure on decarbonising the built environment.
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