ClimateWire: When habitat is free of sea ice for 180 days, for instance, it's estimated that 9 to 21 percent of adult male polar bears face starvation, with other ages and classes being more vulnerable.
Polar bears could face mass starvation and reproductive failure across the entire Canadian archipelago by the end of the century, suggesting an area once considered a last refuge for the animals may no longer be a very good one, according to a new study.
While polar bears have long been the poster child...