The Arctic just experienced its hottest year since record-keeping began more than a century ago, the National Oceanic and Atmospheric Administration announced Wednesday. Rising temperatures in the polar region show no signs of leveling off, either, according to the agency, which said they are rising twice as fast as overall global temperatures. NOAA reviewed how the Arctic is faring in a warming world in the latest iteration of its annual Arctic Report Card. "To observe the Arctic is to take the pulse of the planet," reads the report's executive summary. Since the previous year's report card, climate change has continued...