Nature World: A key polar bear population in Alaska has plummeted 40 percent in the last 10 years, marked by a dramatic increase in deaths of young cubs, according to a new study published Monday.
Scietists from the US Geological Survey (USGS) and Environment Canada found that bear survival rates in the south Beaufort Sea, located off Alaska and northwestern Canada, are particularly low.
Monitoring of this bear population began in 2001, and since then overall survival rates began to climb; however, juvenile...