My suggestion is to use the waste plastic which is generated at an alarming rate, to manufacture rafts in a hexagonal or octagonal shape, each linked to it's immediate neighbour at the corners with a coupling. This coupling will enable each raft to move slightly independantly to allow for wave movement. The upper surface of each raft would need to be either white or silver to reflect sunlight, much as the ice does. Such rafts should be large enough to support creatures such as sealions and seals. Polar bears might be too much of a stretch. There would therefore need to be an occasional raft left out of the pattern to enable such creatures to enter and leave the sea. If a number of identical moulds were created around the planet each country with hopefully a number of such moulds could produce these rafts before the waste left the country, and conceivably shipping companies could convey them to particularly North polar countries where they could be assembled into large rafts. Already this plastic waste is shipped around the planet, why not have it shipped as an end, and particularly useful, product ? A similar product could be manufactured form this waste to basically be anchored on the ground where the ice has already receeded, and could be made perhaps in reinforced sheet form, to enable it to withstand weather extremes. Whether those countries within the arctic circle would allow such masking of their territory, is another matter.
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