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In 1990, the US Navy predicted that the Earth would warm by as much as 4 degrees Celsius by 2040
(documents.theblackvault.com)
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this post was submitted on 01 Sep 2023
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You've converted the absolute value, not the delta.
The quickest in your head conversion of a delta °C --> delta °F is to simply multiply by 2. +4°C --> +8°F
To be accurate, remove 1/10^th^ of the °C value before the multiplication. +4°C --> (4 - 0.4) = 3.6 ---> +7.2 °F
For absolute values, I personally do, for a quick 'in your head' approximation the other way round (°F --> °C) :
Excellent.
Thank you very much! I never could keep this straight in my head.