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Total Displacement of all shipping.


bobegubu
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Interesting question. The answer is not obvious.

The best information that i could find that may be relevant is statistics on ship production since 1964 (see http://www.coltoncompany.com/shipbldg/statistics/world.htm ). If we assume that they are all still operative and full of cargo this would add up to 9x10^8 tons (note that GT in the reference means gross tons and not gigaton). This would displace 9x10^8 m^3 of water. If we assume that the area of the oceans is 3.35x10^14 m^2 then these ships raise the level of the oceans by 2.7x10^-6 m or just 2.7 microns.

Not much of an effect.

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