Just now I did, it says the new plan is:
"building 10 million wind-powered pumps over the Arctic ice cap. In winter, these would be used to pump water to the surface of the ice where it would freeze, thickening the cap."
Wouldn't that be salt water? Would it actually freeze at all?
It freezes just fine, just at a lower temperature of -2C.
A proposal to salt the Arctic in order to lower the melting temperature wouldn't get much support, but it seems like it's also a valid description of the plan.
I wonder why the polar oceans don't freeze solid?
Because ice floats to the top of the water, and insulates the water remaining down below beneath the ice.