LA Times: Federal wildlife monitors spotted nine polar bears in one day swimming in open ocean off Alaska’s northwest coast, and environmental groups say the event is a strong signal that diminished sea ice brought on by warming has put U.S. bears at risk of drowning or dying from effects of fatigue. "The impact of global warming is brutal and tragic for polar bears," said Kassie Siegel of the Center for Biological Diversity. "The only way to limit the number of bears that will drown and starve …