Polar bears face new challenge as sea ice becomes speedier, study says

Rapid global warming has sped up the movement of sea ice off Alaska’s coasts, and already at-risk polar bears are paying a price, a new U.S. study says.
Most sea ice moves throughout the year and the iconic white bears are on a perpetual walk to stay within their preferred habitat, said U.S. Geological Survey research ecologist George Durner, lead author of the study.
Study: Polar bears could feel bite of climate change by 2025
He compares it to living on a treadmill that has picked up sp