We're armed with crampons, ice axes, rope, GPS receivers, and bear spray to ward off grizzlies, and we're trudging toward Sperry Glacier in ... of Greenland's ice sheet shrinking.

The research highlights a new feedback that accelerates changes in ice sheets and the loss of mass from glaciers through iceberg discharges, said Xavier Fettweis, a professor of climatology at the ...

Thompson has made more than 50 expeditions to ice sheets and glaciers around the world, and his teams drilled and retrieved ...