Chief Petty Officer Jeff Atherton
US Coast Guard
U.S. Army photo by Pfc.

The Arctic may become ice-free for the first time on a late August or early September day in the 2020s to 2030s, 10 years earlier than expected, a shocking new study finds.
U.S.
U.S.
Joe Raedle via Getty Images
Roy Rochlin/Getty Images
Justin Sullivan/Getty Images