Animation of maps of sea ice age classification from 1978 through mid-July 2015 and annual minimum / maximum ice extent. Animation by Arctic Portal Team (http://arcticportal.org), based on research data provided by Mark Tschudi, CCAR, University of Colorado. http://nsidc.org/data/docs/daac/nsidc... The animation highlights the scarcity of ancient ice for over 20 years.