Scientists have cracked the code on South Australia’s 2025 Karenia algal bloom — it was no single villain, but a deadly combo of nutrient-laden floodwaters, record coastal upwelling, and a marine heatwave that created the perfect storm for explosive algae growth. The algae itself wasn’t new, but the conditions that let it thrive were unprecedented. The bloom devastated marine life, fisheries, and tourism, leaving communities in the dark for over a year — until now. A major new research initiative, backed by $3.2 million in government funding, is now underway to monitor, predict, and prevent future blooms, turning this crisis into a blueprint for coastal resilience in a warming world.

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