Sea ice in the Arctic appears to have hit its annual minimum extent on Sept. 16, after waning in the 2021 Northern Hemisphere spring and summer. The summertime extent is the 12th-lowest in the ...

Sea ice in the Arctic appears to have hit its annual maximum extent after growing through the fall and winter. The 2021 wintertime extent reached on March 21 ties with 2007’s as the seventh-smallest ...

Editor’s Note: Frida Ghitis, a former CNN producer and correspondent, is a world affairs columnist. She is a weekly opinion contributor to CNN, a contributing columnist to The Washington Post and a ...

Melting sea ice in the fast-warming Arctic Ocean is not making it easier for sailors to navigate a legendary shortcut between Europe and Asia. Researchers say that climate change is causing thicker, ...