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A comment on The USDA's gardening zones shifted, this map shows you what's changed. Parent comment
* https://www.npr.org/sections/thetwo-way/2017/06/20/533662790...
* https://www.azfamily.com/2023/07/20/how-extreme-heat-can-imp...
Air is no longer dense enough:
* https://en.wikipedia.org/wiki/Density_altitude
* https://skybrary.aero/articles/density-altitude
* PDF: https://www.faasafety.gov/files/events/NM/NM07/2023/NM071202...
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* https://www.npr.org/sections/thetwo-way/2017/06/20/533662790...
* https://www.azfamily.com/2023/07/20/how-extreme-heat-can-imp...
Air is no longer dense enough:
* https://en.wikipedia.org/wiki/Density_altitude
* https://skybrary.aero/articles/density-altitude
* PDF: https://www.faasafety.gov/files/events/NM/NM07/2023/NM071202...