Physorg: A new study led by the University of Colorado at Boulder indicates part of the northern Alaska coastline is eroding by up to 45 feet annually due to declining sea ice, warming seawater and increased wave activity. Credit: Robert S. Anderson, University of Colorado The northern coastline of Alaska midway between Point Barrow and Prudhoe Bay is eroding by up to one-third the length of a football field annually because of a “triple whammy” of declining sea ice, warming seawater and …