I see what you and 4W are saying, but it doesn't seem to me like anyone's even tried to see if this or anything like it would work. I might be wrong there, but it doesn't look to me like it's even been researched.
Also, it strikes me that there's an outcry when these things which are visible to humans because they're on land have adverse effects on wildlife. But how much destruction do the propellers of all the ships and boats in the world create to wildlife in the sea? Out of sight, out of mind.
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