in april the extent of arctic sea ice was back to where it was in april 13 years ago
in april the extent of arctic sea ice was back to where it was in april 13 years ago
arctic ocean:165
estimates vary for when the last time the arctic was ice-free: 65 million years ago when fossils indicate that plants existed there to as recently as 5,500 years ago; ice and ocean cores going back 8,000 years to the last warm period or 125,000 during the last intraglacial period.