CNN correspondent joins scientists on mission to Greenland to understand how the vast ice sheet is changing . The Arctic has been warming at a rate of about 1 degree Fahrenheit per decade since satellite measurements began in 1979. Polar 6 is a unique plane . 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 .
CNN correspondent joins scientists on mission to Greenland to understand how the vast ice sheet is changing . The Arctic has been warming at a rate of about 1 degree Fahrenheit per decade since satellite measurements began in 1979. 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 .