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It's difficult to get an exact figure for all polar bear numbers but some bears are almost definitely dying because of global warming.

Rising temperatures cause Arctic sea ice to melt earlier in the year, so the bears are driven to go ashore without sufficient fat reserves to survive late summer and early autumn. Reduction of sea ice means they have to swim more, making them weaker. Some drown. Thinner sea ice makes it harder for them to catch seals. Poorly nourished female bears don't build suitable dens, don't produce as many cubs, and cubs that are born have a lower survival rate.

The Western Hudson Bay subpopulation of polar bears are one of the best studied. Warming temperatures mean that ice-floe breakup in western Hudson Bay now happens three weeks earlier than it did 30 years ago, so the bears' feeding season is similarly shortened. The average weight of single female bears was about 290 kg in 1980. In 2004 the average weight was 230 kg. Bear population in Western Hudson Bay declined 22% between 1987 and 2004.

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Related Questions

What are some things about polar bears?

they live in the arctic and are dying out because of global warming!


How do polar bears cause global warming?

Polar bears do not cause global warming. In fact, polar bears are affected by global warming due to the shrinking of their sea ice habitat. The loss of sea ice reduces their hunting grounds and threatens their survival.


Does global warming affect the survival rate of polar bears?

Global Warming does affect the survival rate of Polar Bears because Global Warming Melts the ice.


Can you stop global warming from killing polar bears?

Probably not. We have only begun to act to stop global warming, and what the world has done so far is nowhere nearly enough. Polar bears are probably dying already. See the related question below.


On what do polar bears depend?

Right now, polar bears depend on humans. The habitat of the polar bear is decreasing. Because of global warming, the ice is melting. Polar bears are dying off because they have to swim long distances to get to ice.


Why do polar bears die of?

people and global warming


What is a polar bears threats to its survival?

Global Warming.


Why are polar bears a cause of global warming?

Polar bears are not a cause of global warming. They are being affected by climate change in that their habitat is decreasing in size (as the sea ice is melting).


Why is the polar bear's habitat dying?

Arctic ice is melting from global warming. Bears need the ice to catch seals which they rely on for food.


What is being done to protect polar bears from global warming?

Countries and their citizens are trying to slow and maybe even stop global warming. This is the only thing that will help polar bears.


How many polar bears are killed due to hunting?

Because of global warming, you can't hunt polar bears


How are polar bears classed on the endangered species list?

Global warming