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Received yesterday — 25 June 2026 Ars Technica - All content

The "sad inevitability" of Europe's heat wave

Europe is in the midst of its second big heat wave of the year, and it’s breaking more records. France just recorded its hottest day ever, with temperatures exceeding 44° Celsius in some places. Around 40 people have drowned in local water bodies, likely attempting to escape the heat, and thousands more are without electricity.

As temperatures hit a sweltering 36° in some regions of the United Kingdom, schools canceled classes and train delays abounded. United Nations Secretary-General Antonio Guterres described London as “cooking.” As the city hosts its annual Climate Action Week, the UK meteorological service has issued a red alert for multiple regions, signaling that exceptionally hot and humid weather is forecasted and likely to impact the general public. Switzerland and Spain have also issued warnings to residents.

Emma Howard Boyd, the former chair of the London Climate Resilience Review who now chairs the National Heat Risk Commission in the UK, said that when it comes to heat resilience in the country, the problem is not just homes—which are usually not air-conditioned.

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© Anadolu via Getty

Received — 21 June 2026 Ars Technica - All content

Trump admin’s coal investments assist plants with repeated violations

In 2023, after years of pollution, equipment failures, and health concerns, the Cumberland Fossil Plant in Tennessee was slated to close within the decade.

The coal-fired plant had been part of a multibillion-dollar settlement in 2011 after its operator, the Tennessee Valley Authority, failed to install pollution control technology a decade earlier. Regulators cited the plant for more air-pollution violations in 2017 and 2023. TVA said it would shutter Cumberland’s units in 2026 and 2028.

Then the Trump administration replaced four of TVA’s board members, and the agency reneged on its retirement plan in February. Now, TVA has a federal pledge for $46 million to extend Cumberland’s lifespan—part of a nationwide push by President Donald Trump to keep older coal plants running.

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© Stephen A. Smith/Southern Alliance for Clean Energy

Received — 19 June 2026 Ars Technica - All content

As global warming threatens corals, scientists search for reefs that can take the heat

MAJURO, Marshall Islands—Perched on the bow of an aluminum landing craft, Anne Cohen gazed a few yards ahead of the vessel toward a yellow robot gliding across the emerald Majuro lagoon.

The unmanned surface vehicle, called Yellowfin, was quickly becoming one of the coral researcher’s most dependable guides in these Central Pacific waters.

“She’s the best dive buddy,” said Cohen, a tenured scientist at the Woods Hole Oceanographic Institution in Cape Cod. Programmed to navigate to a precise set of coordinates, the robot cut through small swells like a tiny sailboat without a mast, directing Cohen toward a destination she had traveled thousands of miles to revisit.

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© Lukasz Larsson Warzecha/Getty Images

Received — 16 June 2026 Ars Technica - All content

Trump admin abandons fight against wind energy as clean energy output surges

The Trump administration has abandoned its effort to halt wind energy projects across the United States and dropped its challenge to the court ruling that tossed President Donald Trump’s order freezing federal permitting and leasing for wind projects. States that challenged the order hailed the development as one of the most significant legal victories against the Trump White House’s campaign against the energy transition.

On Monday, the US Court of Appeals for the First Circuit dismissed the appeal after the Justice Department filed a motion for its voluntary dismissal on June 10.

The case against Trump’s executive order was filed in May 2025 by a coalition of attorneys general from 17 states and Washington, DC, led by New York Attorney General Letitia James.

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© glegorly

Received — 13 June 2026 Ars Technica - All content

Threads of underground fungal networks are long enough to reach beyond the Solar System

Hidden underground around the world lie 110 quadrillion kilometers of arbuscular mycorrhizal fungal networks—webs of ultra-thin threads that, if connected in a single line, would stretch almost a billion times the distance between the Earth and the sun, according to new research published in Science on Thursday.

These fungal communities form intimate relationships with the roots of plants, which they provide with nutrients like phosphorus and nitrogen in exchange for carbon, 1 billion tons of which the networks sequester underground annually, previous research has found. If the fungal network wasn’t storing it, that carbon would be warming the atmosphere.

But those networks have never been mapped globally until now. The new study led by Society for the Protection of Underground Networks, or SPUN, an organization founded to map mycorrhizal fungi networks, used a combination of literature review, soil samples from around the globe, machine learning and laboratory testing to estimate the distribution and mass of these systems and map where they are densest.

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© HHelene via Getty Images

Received — 11 June 2026 Ars Technica - All content

Alaskans will be flying blind after NSF decommissions ocean monitoring network

The upcoming loss of a deep-ocean monitoring system is triggering deep anxiety in Alaska, the nation’s top fish-producing state, where temperatures are warming twice as quickly as the global average.

The National Science Foundation announced plans in May to decommission the Ocean Observatories Initiative, a nearly $368 million network of scientific instruments that tracks ocean chemistry, wave action, water temperature, salinity, and a host of other metrics.

The real-time information from these ocean observatories helps scientists, fishery managers, coastal hazard planners, and even the military plan and prepare for the future. Whether that’s calculating how much fish can be harvested or when a marine heatwave or giant wave action may be occurring, the data is used by a plethora of sources.

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© Laura Dwyer/NOAA

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