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by AYBABTME
1289 days ago
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To be fair, there's limited shipbuilding capacity in the world, with a few dozen very large shipyards capable of producing a few dozens ships a year. And they're busy as is. Also given the shear scale of those yards, it's not like you can just build new ones on demand. Those things are huge, they span the size of a medium city, and require an entire economy of skilled people around them. So even if we were to replace all of the world's fleet to be more energy efficient (which would almost by definition mean larger/longer ships, since they benefit from hydrodynamic efficiencies), it would take a lonnng time to replace the world's cargo fleet. |
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The hydrodynamic efficiencies are a small part of the problem, there are many other things that can be done. You don't need to scrap a perfectly good hull, you can simply choose to run slower, burn higher-quality fuels, or strap on an oxidation catalyst (DOC) to cut CO, particulate filter (DPF) to reduce particulate emissions, or add selective catalytic reduction (SCR) to reduce NOx emissions.
But until regulation and the market catch up, old ships will choose to run too fast, to burn whatever's cheapest, and to vent their exhaust directly into the atmosphere.