CNN correspondent joins scientists on expedition to try to understand how the vast ice sheet is changing . Aerial reconnaissance missions and ice core drilling data helping build picture of past climate and help predict future . Melt layers lead to extremely warm summers here in the recent years , according to scientists . ` ` We are doing an experiment with our satellites and we have no idea what the outcome will be , '' says glaciologist .
CNN correspondent joins scientists on mission to Greenland to understand how the vast ice sheet is changing . Aerial radar missions and ice core drilling data helping build picture of past climate and helps predict future . Melt layers point to extremely warm summers here in the recent years , according to scientists . `` We are doing an experiment with our planet and we have no idea what the outcome will be , '' says glaciologist .