General Official Joe Biden - The Peoples Prez! **Appreciation Thread**

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Freeloading Rusty

Came out my mama's pussy, I'm on welfare.
Jan 11, 2016
20,271
20,474
Displacement.

It's a dumb comment assuming it's a slight dig at climate change, but he's not wrong.
Someone else’s response…



As good as no rise at all. Still for the sake of finding out why, lets work it out;

As of 2009 estimate, the world merchant fleet capacity was about 1.192 trillion mt dwt. Thanks to recession in the industry, there has been considerable scrapping so the fleet expansion has not been significant since then.
Still lets calculate the displacement for 1.2 trillion mt

For average sea water density 1025kg/m^3, this works out to be 1.17 trillion cubic meters of water. The surface area covered by ocean is around 3.6E14 squaremeters. (a very rough estimate, from Wikipedia).

Based on above data, the rise in sea level assuming uniform rise over the entire surface comes to just a fraction of a millimeter.

The effect of other ships (warships, private/fishing boats etc) are negligible compared to the merchant fleet size.

Now, some considerations:
With each millimeter rise in sea level, the surface area increases making it difficult to predict.

Sea level rise is not uniform across the earth's surface. Blame ocean currents, Coriolis force and the way oceans are connected. Another reason sea level rises is that oceans are warming up, and this heating is not uniform. Warmer ocean surface is at a higher level than colder ones.

Sea level from warming and melting glaciers comes to barely a millimeter to more than a centimeter in different locations around the world. So effect of ship's displacement is negligible.
 

Hauler

It takes twice as long to build bridges you burn.
Feb 3, 2016
34,426
46,063
Based on above data, the rise in sea level assuming uniform rise over the entire surface comes to just a fraction of a millimeter.
I love that someone broke it down. And as I said, he's not wrong. A fraction of a millimeter is negligible, but it is something.

Loaded ship vs empty ship would displace a different amount of water as well, so this dude's math is probably off a bit unless he looked at every floating ship's freight documents.
 

Freeloading Rusty

Came out my mama's pussy, I'm on welfare.
Jan 11, 2016
20,271
20,474
I love that someone broke it down. And as I said, he's not wrong. A fraction of a millimeter is negligible, but it is something.

Loaded ship vs empty ship would displace a different amount of water as well, so this dude's math is probably off a bit unless he looked at every floating ship's freight documents.
Yeah those 2mm are going to solve all our sea level problems.

Now just to figure out how to ship massive amounts of product internationally without boats?
 

Hauler

It takes twice as long to build bridges you burn.
Feb 3, 2016
34,426
46,063
Removing all the ships to fight climate change/ raising levels… only to ship all that cargo by air sounds counter intuitive.

No wonder so many thought it was such a dumb thing for him to say.
I never said it was a smart comment.
 

John Lee Pettimore

Further south than you
May 18, 2021
3,550
3,451
Talking about ships, here's a vid from a channel I fucking love. They have all sorts of videos of size comparisons, usually from fiction - movie monsters scale in relation to each other, fictive buildings, robots, starships etc. This one is fictional ships.

View: https://youtu.be/ykCMsLPMca0



🇦🇺