Your World Tonight Another planetary boundary crossed, ostrich cull put off, Zelenskyy warning at UNGA, and more
Sep 24, 2025
Scientists reveal that rising greenhouse gas emissions have pushed ocean acidity beyond a crucial threshold, threatening marine ecosystems. In a surprising twist, Canada’s Supreme Court halts the culling of 400 ostriches amid avian flu worries. President Zelenskyy passionately implores the UN not to forsake Ukraine, warning of Russia's ambitions. Tensions spike with a deadly sniper attack on an ICE facility, while debates continue over grade six students' transition to middle school affecting academic performance. Plus, NASA gears up for Artemis II with Canada’s first astronaut in deep space.
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Oceans Crossing A Safe Acidification Threshold
- Oceans have absorbed vast CO2 but reached a chemical tipping point reducing shell-building minerals for sea life.
- Scientists warn acidification will worsen for decades unless emissions drop drastically.
Acidification Threatens Shellfish And Fisheries
- Ocean acidification reduces carbonate available for corals, oysters, mussels and crabs to build shells.
- That can shrink fisheries and lower seafood yields important to economies like British Columbia's.
Cut Emissions Immediately To Protect Oceans
- Reduce greenhouse gas emissions drastically to slow ocean chemistry deterioration.
- Immediate, large emission cuts are urgent to preserve ocean health for decades.