Remember when we were enouraged to remake the world's economy because CO2 allegedly killed three polar bear cubs? All three may be alive and well

The evidence:  A very small number of adult bears with cubs went swimming. When the adult bears were next seen, maybe a year (or more?) later, less than half the cubs were missing.  Conclusion:  carbon dioxide caused the cubs to drown.

Long-distance swims associated with loss of sea ice may cause problems for Alaska polar bears - The Washington Post

Eleven were mothers with cubs. In six cases, dependent cubs survived the swim when they were spotted again two months to a year later. But five cases, cubs could not be located after the long-distance swim.

USGS research zoologist George Durner said Tuesday that researchers cannot say for sure that the missing cubs drowned, but the evidence suggests long-distance swimming may be risky.

“For me, it raises my eyebrows to see the differences in mortality rates in cubs,” he said. “I wish we had better information to see when the mortality was actually occurring. That would give us a lot more information, but we don’t have that.”

Cub survival rate was higher for bears that were not recorded taking long-distance swims.

“There were seven of those individuals from which we had a re-sighting, and only two of those had lost their cubs,” Durner said.
...
Not all polar bears attempt long-distance swims...
One female bear tracked by global positioning system collar two years ago left a Beaufort Sea beach near Barrow, Alaska, and swam 426 miles over nine days without a break to pack ice. She walked or swam another 1,118 miles, eventually looping south back to Alaska soil a few miles from the Canada border. When Durner and other researchers recaptured her after two months, her body mass was reduced 22 percent to 389.4 pounds and her internal temperature had dropped. Her yearling cub had disappeared.

The Bear Facts on Polar Bears

some bears in the Hudson Bay area wean their young at age 1 1/2.

Flashback: More global warming propaganda from WWF and Reuters; they find that polar bear cubs can die of hypothermia when hit by storms during long-distance swims

Out of 11 total swimming cubs, the difference between a 45% and 18% "normal" mortality rate is only three total cubs.