There's a saying that in a big city you are never more than six feet away...

CNN Climate 2 years ago

There's a saying that in a big city you are never more than six feet away from a rat. It's an urban myth, but scientists are warning cities across the globe are becoming far rattier, and the boom is primarily driven by one factor: climate change. Jonathan Richardson, a biology professor at the University of Richmond, decided to research urban rat trends after seeing media reports of rats taking over cities. These tended to focus on single locations and "usually without a lot of hard data," he told CNN. He and his team decided to change that. They requested rat stats from the 200 biggest US cities by population, but found only 13 had the quality long-term data they needed. To give more geographical range, the researchers also included three international cities: Toronto, Tokyo and Amsterdam. The data collected spanned an average of 12 years and comprised rat sightings, trappings and inspection reports. It revealed "significant increasing trends" in rat numbers in 11 of the 16 cities, according to their study, published Friday in the journal Science Advances. The study linked rat increases to several factors, including high population densities and low amounts of urban vegetation, but the predominant influence was warmer average temperatures. Read more at the link in our bio. 📸: Nick Lachance/Toronto Star/Getty Images

layersDaily Sustainability Digest

Published about 4 hours ago



Europe’s transition accountants set the bar: BloombergNEF estimates the EU, UK and Norway must mobilise about $1.3 trillion per year to stay on track for net zero by mid‑century. Capital is pivoting to projects that prove demand reduction, resilience and audited performance, raising the premium on whole life carbon, whole life carbon assessment, lifecycle assessment and life cycle cost embedded in delivery, supported by environmental product declarations (EPDs) and verifiable data.

Portfolios aligned to net zero whole life carbon and decarbonising the built environment will clear investment committees faster, especially where sustainable building design reflects life cycle thinking in construction and aligns with breeam and anticipated breeam v7 requirements. Expect stronger scrutiny of embodied carbon and the carbon footprint of construction, with tighter performance guarantees and less tolerance for optimistic modelling.

Physical risk is now a design determinant. Severe floods in Nepal removed more than a tenth of national hydropower capacity in a week, underlining the limits of single‑technology strategies and historic baselines. Credible, sustainable design calls for diversified energy systems, including renewable generation, debris‑ and sediment‑tolerant assets, green infrastructure and watershed‑scale nature‑based measures, paired with specifications that reduce embodied carbon in materials while improving building lifecycle performance, carbon footprint reduction, the environmental impact of construction and low‑impact construction. Lenders and insurers are steering towards teams demonstrating sustainable building practices and sustainable architecture with bankable pathways to carbon neutral construction.

Digital waste tracking in the UK will impose radical transparency across construction supply chains. With end‑to‑end data, waste becomes both a liability and a tradable asset, accelerating the circular economy and circular economy in construction through design for disassembly, end‑of‑life reuse in construction, circular construction strategies and product passports. Expect rapid uptake of eco‑design for buildings, resource efficiency in construction and sustainable material specification, with greater use of low embodied carbon materials, renewable building materials, green building materials and green building products to reduce embodied carbon across retrofit and new build. The regulatory shift will reward firms that can evidence environmental sustainability in construction with robust datasets that unlock prequalification.

Early regulatory clearance for an underground micro‑reactor in the United States signals the coming of site‑adjacent, 24/7 low‑carbon heat and power for energy‑intensive materials plants and district energy. If proven at scale, such clean energy can enable low carbon construction materials, low carbon design for energy‑efficient buildings and low carbon building operations, supporting net zero carbon buildings across sustainable urban development and speeding net zero carbon delivery.

The direction of travel is unmistakable: sustainable construction grounded in whole life carbon, embodied carbon accountability and the circular economy is now the baseline for green construction, eco‑friendly construction and sustainability across every building and infrastructure programme.

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