Antarctic ice loss increased rapidly in past climates when oceans warmed first, raising risks for modern coastlines.

This story was produced in partnership with the Pulitzer Center’s Ocean Reporting Network. A haze of ice crystals in the air created a halo around the low sun as three snowmobiles thundered onto the ...

If you purchase something from the links on this page, we may earn a commission. As winter sets in and snow begins to blanket the ground with this week's arctic sweep across the U.S., keeping walkways ...