Arctic has lost more sea ice this year than at any time since satellite records began in 1979, Nasa says. Scientists involved in the calculations say it is part of a fundamental change. What is ...

The team concluded that the Martian northern polar cap is quite young, and it's depressing the ground underneath. "We show that the ice sheet pushes the underlying ground into the mantle at a rate ...

(CNN)-- It could be the ultimate test of human endurance: Three British explorers are risking their lives in subzero temperatures to measure the melting Arctic ice cap. The team is on a three ...