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Key developments
Climate change drove Western snow drought odds
A new Proceedings of the National Academy of Sciences study led by Colorado School of Mines researchers found human-caused climate change made the severe 2026 Western U.S. snow drought about 4.4 times more likely, and about 14 times more likely in the Upper Colorado River Basin. The event left mountain snow-water storage roughly 40 cubic kilometers below a similarly rare preindustrial-climate event, exceeding Lake Mead’s storage capacity. Separately, the Bureau of Reclamation projects Colorado’s Wayne N. Aspinall federal hydropower unit will generate nearly 30% less electricity than its post-1978 average, with Blue Mesa Reservoir expected to end the year at 17% of live storage.
Why it matters
The same warming-driven snowpack losses now threaten Western water supply, wildfire risk, agriculture, hydropower reliability and utility costs.
Sources & driving stories
COLORADO SCHOOL OF MINES NEWSROOM
Colorado School of Mines Newsroom coverageRENEWABLE ENERGY WORLD
Renewable Energy World coverageClimate change intensified deadly West Africa floods
A new World Weather Attribution analysis reported by Climate Home News found human-driven climate change made recent floods across Ghana, Togo, Côte d’Ivoire and Nigeria more likely and intense. Weeks of torrential rain and flash flooding from May killed more than 70 people and displaced thousands; rainfall once considered rare over three days can now be expected every two to four years. In Abidjan, 59 deaths were reported, including around 20 in Mossikro after a hillside collapse, while authorities began demolitions and plan staged relocation of about 5,000 residents.
Why it matters
The findings link climate-amplified rainfall with unmanaged urban expansion, unsafe housing and unresolved questions over climate finance and relocation rights.
Sources & driving stories
CLIMATE HOME NEWS · Vivian Chime
Climate Home News coverageMarine heatwaves now cover vast ocean areas
Mother Jones reported that the world’s oceans had their hottest June on record, with nearly 40% of global ocean area experiencing marine heatwaves. Intense hot patches in the Mediterranean Sea and Pacific Ocean were more than 10°F above normal, coinciding with Northern Hemisphere heat records, heat deaths in New Jersey and Western Europe’s hottest June on record. The report also cited a NOAA forecast giving an emerging El Niño an 81% chance of becoming one of the strongest on record.
Why it matters
Ocean heat is a major driver of extreme weather, sea-level rise, coral damage and potentially prolonged global temperature elevation into next year.
Sources & driving stories
MOTHER JONES · Sachi Kitajima Mulkey
Mother Jones coverageWorth noting
WORTH NOTING
Dairy heat stress cuts milk nutrients
Sentient’s Melina Walling reported on an Environmental Research Letters study of more than 6.5 million U.S. dairy cows showing heat and humidity reduce milk volume as well as fat and protein content, exposing farms to pricing losses tied to milk components.
WORTH NOTING
Attribution science gains operational speed
WSU Insider reported that a National Academies consensus report concludes extreme-event attribution can now be performed for many event types within days to weeks, with growing relevance for emergency planning and climate litigation.
WORTH NOTING
EU carbon-market review draws scrutiny
Carbon Brief’s Orla Dwyer reported that the European Commission proposed slowing the ETS cap decline from 2031 and extending free allowances until 2038, prompting concern that the changes could weaken carbon prices and long-term targets.
Still unclear
OPEN QUESTION
How fast can Colorado River operations adapt?
The snow-drought study projects Western U.S. events as severe as 2026 rising from about a 10% annual chance today to 32% by the 2050s, while hydropower costs are already increasing.
OPEN QUESTION
Will flood relocations reduce vulnerability?
West African flood-risk demolitions may shift rather than solve danger if residents are moved without safe, affordable housing, compensation and access to livelihoods.