Heat Planning and Water Stress Move Center Stage
The clearest climate developments were about heat becoming a direct planning problem. A new U.S. analysis found average summer temperatures have risen in 97% of 243 major cities since 1970, with human-caused climate change the main driver in 221 of them. In the UK, the Climate Change Committee said hospitals and care homes should be cooled within 10 years, and schools within 25, after an estimated 3,000 excess deaths during the 2022 heatwave.
Another update slightly changed the long-range outlook without making it comfortable. Researchers are replacing the older most-extreme emissions pathway with new scenarios that reflect slower coal growth and cheaper renewables, trimming the top-end century outcome to roughly 3.5C rather than about 4.5C. But the world still looks much closer to around 3C warming than to the Paris 1.5C goal. Forecasters were also watching a developing El Niño, which could suppress some Atlantic hurricane activity while increasing coastal flooding risks in places like South Florida.
Implementation pressures showed up in water and infrastructure. In Texas, a judge allowed Sinton's challenge to Corpus Christi's emergency groundwater project to move into a longer court fight, turning a drought-era supply measure into a test case for how fast-growing metros, data centers, and smaller communities compete for water. India also reported a record 6.1 GW of new wind additions in 2025/26, a reminder that clean-energy buildout is still moving, even as delivery increasingly depends on grids, land, water, and local permitting.
Key Points
- Summer temperatures have warmed in 97% of 243 major U.S. cities since 1970, with human-caused climate change the main driver in 221.
- The UK Climate Change Committee called for cooling in hospitals and care homes within a decade and stronger heat protections for workers.
- Updated emissions scenarios lower the old worst-case endpoint, but current trajectories still imply roughly 3C warming and keep 1.5C out of reach.
- A strengthening El Niño could reduce Atlantic storm counts while worsening high-tide flooding and other coastal disruptions.
- A Texas court fight over Corpus Christi groundwater highlights water scarcity as a growing constraint on development, including data-center expansion.
Implications
Heat adaptation is moving from awareness campaigns to capital spending, building standards, and workplace rules.
A lower top-end emissions scenario does not materially ease planning assumptions; the central problem remains sustained, policy-relevant warming.
Water availability is becoming a binding governance issue alongside grid capacity for new digital and industrial growth.
Things to watch
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Whether El Niño strengthens into the upper forecast range by late summer and changes hurricane-season expectations.
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Whether UK ministers turn the adaptation committee's recommendations into binding requirements and funding commitments.
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Whether the Texas groundwater case delays supply expansion or prompts wider scrutiny of data-center water demand.