Older adults are far more vulnerable to heat than we thought—hit dangerous temps 4.7 to 7.5 degrees Celsius lower than younger folks. As global warming accelerates, even a 1.5°C rise could make deadly heat waves far more common for seniors, whose bodies struggle to cool down due to reduced sweating, weaker hearts, and chronic conditions. Current heat warnings and safety systems? Not cutting it. Australia’s hotter regions are especially at risk. The fix? Rethink heat alerts to be age-specific—and tackle the root cause: slashing emissions to slow climate change.

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