polar bears
Polar bears are under threat of starvation from climate change due to melting sea ice, a new study from scientists with the Canadian Wildlife Service concludes. The study, by Canadian polar bear scientists Ian Stirling, Nicholas J. Lunn and John Iacozza, found that the bears' main food source, ringed seals which live on the ice of Hudson Bay, are becoming less accessible because of a shorter ice season.
"We're wrong if we think that climate change is something that will happen far off in the future. Polar bears are starving now and we need to act now to stop climate change," said Kevin Jardine, Greenpeace climate impacts specialist.
Building on a past NASA study which found a 2.9 percent decline
per decade in total Arctic sea ice extent over the last 20 years, the
new Canadian study further concludes that the sea ice season in
western Hudson Bay has been reduced by about three weeks over
the same period.
The study says that, as a result of the reduction in sea ice, polar
bears have less time to hunt and are returning to land in poorer
condition. Weight for both male and female polar bears is declining
and female bears are having fewer cubs. Although significant
population decline has not yet begun, this is inevitable if the trends
continue.
Hudson Bay polar bears are unique in the Arctic because of their
tendency to fast for six to eight months each year, depending
heavily on hunting during the sea ice season for survival. Since the
sea ice season is the shortest in Hudson Bay of all the regions of the
Arctic Ocean, these bears are on the edge of survival, and are likely
to be among the first to be affected by sea ice decline.
The Canadian study also draws attention to an increase in bear-human
altercations as hungry polar bears wander into the northern
Canadian community of Churchill, Manitoba.
Executive Director of the Churchill Northern Study Center, Harvey
Lemelin, said:
"What we consider encounters now are not only bear
sightings but bears that have to be moved away from the property
using everything from dogs to vehicles to cracker shells. From the
last three years we've gone from 20 encounters to 36 and we're not
done with the season yet."
"Starving polar bears, Asian floods and dying coral reefs are all
major climate danger signals," said Jardine. "World governments
must begin urgent negotiations to cut global greenhouse gas emissions by more than 50 percent and begin the phase-out of
fossil fuels such as coal, oil and natural gas," he said.