I think that by controlling export through fram/garlic press/Bering stretch , enough ice could be saved to prolong the demise of the Arctic.
The problem with this idea along with that of trying to pump seawater to the top of the ice to build it up, is both fail to understand the scale of resources and energy necessary to implement them.
While they are presented as "simple" solutions they do not begin to address the work required. Blocking the Fram and the channels in the CAA would without question take more resources and energy than every other major civil enterprise ever attempted, combined.
The pump idea would require the placement (and continuing maintenance...) of literally 10's of millions of pumps, which would themselves require the energy to pump thousands of KM3 of sea water across the ice. To keep that incontext, the City of New York pumps only about 2.0 KM3 of waste water during an entire *year*; we're talking about pumping over five thousand times that.
In short, I consider even the *discussion* of such a solution utterly nonsensical, and a distraction from much more effective and rational discussions about mitigating the proximate cause of the problem we are faced with.
Totally absurd, maybe...but 1.0 KM3 would add 1 meter thickness to 1/4 the area of everything North of 80N. Properly located I imaging that volume of extra ice would help stabilize the pack, reducing mobility. Maybe stop the garlic press or reduce Fram export, who knows. Further, 5000hp operating 200 days can draw said 1km3 20 vertical ft. How much distribution could be coerced from gravity, gives an idea of how many pumps would be required... Sea ice being relatively flat, especially this top-engineered type, lets let a pump flood an area of 200 km^2. So we need 5000 1HP pumps for this exercise.
Or maybe the experts can agree that strategically placed 2m enhancements on 50000 km^2 can help. You are down to 500hp and maybe 250 sites.
Its ridiculous, sure, but not more than an order of magnitude out.