Just pure pleasantry from me it was.
Take ping pong balls, for example, to make a semi floating structure that over a large enough surface area should be able to hold the distributed weight of a few polar bears.
Melted summer Arctic ice = 4,000,000 km2 = 4,000,000,000,000 m²
Number of 40mm ping-pong balls in 1 square metre with hex packing
= pi/6 * sqrt(3);
= (1000/40)² * pi/6 * sqrt(3) = 567 ping pong balls per square meter.
567 * 4,000,000,000,000
= 2,268,000,000,000,000 ping-pong balls...
22 million ping-pong balls / 1 jumbo jet:
= 2,268,000,000,000,000 / 22,000,000
= 103,090,909 jumbo jets.
Ignoring the environmental carnage that this would create, such as ingestion, transpiration interference and wind making mountains of them all around the coasts, the logistics of making that many balls would be astronomical in raw materials extraction, processing and manufacture, storage, transportation and deployment, and the carbon footprint involved to make that happen, so forget it!