Polar bears have long been seen as a symbol of global warming. You become happy to see and it boost your knowledge

1. Polar bears have long been seen as a symbol of global
warming's damaging impact on the natural world.
The bears rely on Arctic sea ice to hunt seals - so its decline puts the species at risk of
extinction.
Researchers found the animals were using ice that breaks off glaciers.
"They survive in fjords that are sea ice-free more than eight months of the year because
they have access to the glacier - freshwater - ice", said University of Washington polar
scientist Kristin Laidre, the study's lead author.
"One of the big questions is where in the Arctic will polar bears be able to hang on," Dr.
Laidre said. "I think that bears in a place like this can teach us a lot about where those
places might be.
The researcher tagged the bears with satellite tracking devices and collected genetic
samples.
Dr. Beth Shapiro, geneticist and co-author of the study, said they observed "the most
genetically isolated population of polar bears anywhere on the planet".

2. "We know that this population has been living separately from other polar bear
populations for at least several hundred years," she said.
Dr. Shapiro said that these bears "are not thriving" - they reproduce more slowly and
are smaller in size.
She added that it is difficult to know whether this sub-population is surviving because of
genetic adaptations, or "a different response... to a very different climate and habitat".
There are said to be roughly 26,000 polar bears remaining.