this post was submitted on 01 Sep 2023
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Collapse

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This is the place for discussing the potential collapse of modern civilization and the environment.

Collapse, in this context, refers to the significant loss of an established level or complexity towards a much simpler state. It can occur differently within many areas, orderly or chaotically, and be willing or unwilling. It does not necessarily imply human extinction or a singular, global event. Although, the longer the duration, the more it resembles a ‘decline’ instead of collapse.

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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) (3 children)

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.