"More than 26,000 years ago, sea level was much lower than it is today partly because the ice sheets that jut out from the continent of Antarctica were enormous and covered by grounded ice—ice that was fully attached to the seafloor."

"Several companies turned back or rerouted Arctic sailings after the open-water conditions of the past several years gave way to relatively heavy ice."

"The Titanic tragedy in 1912 left one enduring legacy: the creation of a group monitoring sea ice in the North Atlantic."