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Freeloading Rusty

Here comes Rover, sniffin’ at your ass
Jan 11, 2016
26,916
26,743
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

Been fallin so long it's like gravitys gone
Feb 3, 2016
45,414
57,814
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

Here comes Rover, sniffin’ at your ass
Jan 11, 2016
26,916
26,743
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

Been fallin so long it's like gravitys gone
Feb 3, 2016
45,414
57,814
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.
 

Zeph

TMMAC Addict
Jan 22, 2015
24,355
32,126
When you have a 50% pull back, the gains afterwards aren't really gains. It's recovery.

The crash wasn't Obama's fault. Just like the Covid collapse wasn't Trumps. Both have tooted their own horn on the market "gains" under their watch but it's mostly spin-doctor bullshit when it's following a huge sell off.
A politicians policies can accelerate or dampen a recovery.