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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)
submitted 1 year ago by throws_lemy@lemmy.nz to c/collapse@lemmy.ml
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[-] DerPlouk@lemm.ee 14 points 1 year ago* (last edited 1 year ago)

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) :

  1. remove 32 °F (78°F --> 46)
  2. divide by 2 (46 --> 23°C; I may stop there for a very rough approximation)
  3. add 1°C per decade (if you got 23°C, add 2°C --> 25°C; I usually stop there)
  4. add 0.1°C per unit (25 --> 25.5°C; it's not the exact result but not too far)
[-] drwho@beehaw.org 3 points 1 year ago

Thank you very much! I never could keep this straight in my head.

[-] Crackhappy@lemmy.world 3 points 1 year ago

Excellent.

this post was submitted on 01 Sep 2023
159 points (98.2% liked)

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