Runners already face a daunting challenge when they line up at the start of a marathon, but they might increasingly find themselves with another obstacle to reckon with: global warming.
A new study claims that rising temperatures around the world will make it harder for elite athletes to break the marathon world record, or for recreational runners to hit their target times.
Of the 221 races analyzed in the report from Climate Central released last week, 86% of them are less likely to have optimal racing conditions for runners by 2045.
That includes last Sunday's New York City Marathon and the other six major marathons around the world — London, Berlin, Tokyo, Chicago, Boston, and Sydney.
For runners, the consequences of running in hot conditions can be extreme.
"We've seen time and time again where athletes are passing out from dehydration and heat exhaustion during races and taking months to recover," Scottish distance runner Mhairi Maclennan told CNN Sports.
Read more at the link in @cnnclimate's bio.
📸: Craig T Fruchtman/Getty Images; Alex Davidson/Getty Images; Annegret Hilse/Reuters
The latest cycle of developments in sustainable construction signals an inflection point for the built environment, driven by financial systems and disclosure norms converging on climate and nature risk. More than 700 organisations are adopting the Taskforce on Nature-related Financial Disclosures framework, placing natural capital at the centre of environmental sustainability in construction. The integration of nature metrics into financial decision-making will transform procurement and sustainable material specification, reshaping how investors evaluate whole life carbon and embodied carbon exposure across projects.
The upcoming International Sustainability Standards Board recommendations are expected to formalise nature-related risk reporting, aligning with existing standards for whole life carbon assessment. This evolution supports greater transparency in lifecycle assessment and life cycle cost analysis, accelerating the transition toward net zero whole life carbon strategies. Through improved building lifecycle performance and resource efficiency in construction, the industry is being pushed toward evidence-based low carbon design rather than carbon offset accounting.
The proposed Tropical Forests Forever Facility, valued at $125 billion, underlines growing links between forest conservation finance and circular economy in construction. Implications stretch into renewable building materials, sustainable timber sourcing, and eco-design for buildings within fast-urbanising tropical regions. Such measures advance green construction principles aligned with sustainable building practices and breeam certification.
Scrutiny of corporate carbon claims is reshaping marketing narratives as airlines abandon false neutrality statements, as seen when European airlines agreed to drop misleading climate claims. By extension, net zero carbon buildings and low carbon building approaches are expected to prioritise intrinsic mitigation, verifying reduced embodied carbon in materials through environmental product declarations (EPDs). The shift underscores life cycle thinking in construction and the growing expectation of quantifiable carbon footprint reduction across supply chains.
With the World Bank warning that climate impacts could cost some nations up to 30% of GDP by mid-century, infrastructure resilience is no longer optional. Decarbonising the built environment demands integration of low embodied carbon materials, circular construction strategies, and adaptive sustainable building design. The sector faces intensifying pressure to balance energy-efficient buildings with end-of-life reuse in construction, achieving measurable results across the full environmental impact of construction. The momentum now lies where climate meets capital, defining the next chapter in eco-friendly construction and credible net zero carbon advancement.
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