July 25, 2025

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Deadly US Heat Wave Puts 100M Under Warning

A massive heat wave has thrust nearly 100 million Americans into heat advisories, stretching from the Plains to the Northeast and Gulf Coast. On Friday, the National Weather Service issued warnings across major metros—including Dallas, St. Louis, Boston, New York and Philadelphia—where heat-index readings could top 107 °F.

Fatalities highlight growing risks: a Dallas man in his 60s became the first confirmed heat-related death of the season, and a 61-year-old Chicagoan died in Peoria after his body temperature soared to 110 °F. Public health officials urge residents—especially older adults, children and those with chronic conditions—to stay hydrated, seek shade and minimize outdoor activity during peak heat hours.

Great Lakes Climate Report Warns of Whitefish Collapse and Widening Economic Toll

A new report by the Environmental Law and Policy Center warns that Lake whitefish — a Great Lakes staple — could vanish from some regions of Lake Michigan within five years due to warming winters and invasive species. Reduced ice cover, essential for protecting shoreline eggs, combines with zebra and quagga mussel predation to push this prized fish toward local extinction even if commercial fishing halts.

The analysis also highlights broad economic damages across tourism, shipping, winter sports and public health. Key findings include:

Trout habitat losses of 68% for brook trout and 32% for brown trout in Wisconsin streams by mid-century.

Disrupted ice-dependent recreation and altered shipping schedules.

Rising heat- and flood-related health risks and impacts on fisheries revenue.

Climate-driven changes to ice cover, water temperature and ecosystem balance are reshaping both biology and local economies in the Great Lakes region.

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Caribbean Leaders Laud ICJ Advisory Opinion as Landmark Climate Justice Win

Caribbean leaders have welcomed the International Court of Justice’s (ICJ) landmark advisory opinion on climate change as a historic legal victory for small island states. Delivered this week, the opinion underscores that treaties like the Paris Agreement impose substantive legal obligations, not merely procedural commitments, and recognizes a clean, healthy, and sustainable environment as a human right.

Prime Minister Ralph Gonsalves of St. Vincent and the Grenadines and Bahamas Attorney General Ryan Pinder hailed the ruling’s potential to strengthen their negotiating power and unlock avenues for reparations. With recent hurricanes wreaking havoc across the region, they say the ICJ opinion provides small nations a new platform to hold major polluters accountable and pursue climate justice.

AMOC Collapse Could Freeze Ireland by 2050, Warns Science Expert

Science communicator Hank Green warns that a collapse of the Atlantic meridional overturning circulation (AMOC) could plunge Ireland into near–Siberia conditions by 2050. In a recent YouTube video following his trip to Dublin, Green emphasized that the AMOC’s ocean-scale “heat pump” is what makes Ireland’s mild winters possible, noting that Dublin sits at a latitude comparable to southern Alaska.

While a 2025 Woods Hole study found no clear weakening of the AMOC over the last 60 years, other research from 2021 and 2023 identified early warning signs and projected a shutdown could occur within decades. Such a shutdown could slash Irish mean temperatures by 5–10°C, wreak havoc on agriculture, infrastructure, and water systems, and bring colder, drier summers and stormier winters to Ireland and the UK.

Australia’s Worst Algae Bloom Kills Over 14,000 Marine Animals

Australia is facing its worst harmful algal bloom in decades. Since March 2025, a toxic Karenia mikimotoi bloom has spread over an estimated 5,000 km² of South Australia’s coast, killing at least 14,000 marine animals, from finfish and turtles to rare leafy and weedy seadragons.

Experts warn that elevated sea surface temperatures (+2.5 °C above normal), nutrient runoff from 2022 River Murray floods, and calm conditions have fueled the hypoxic, gill-and neurological-damaging event. The South Australian government has declared a natural disaster and pledged AUD 14 million in relief, while scientists urge cuts to greenhouse emissions and agricultural runoff to prevent recurrence.

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Deadly US Heat Wave: 100M Under Warning as Heat Index Soars Past 107°F