our destination, the russell glacier. places on the planet when it comes to climate change. these stunning lakes, a harbinger of the retreating ice sheet. this green scientist is my guide for the expedition. why is greenland so important when it comes to understanding climate change, and why does it affect people at home? >> now, half of the rate of the sea level rise comes from the melting to have greenland ice sheet. it is an average of one kilometer thick of ice. and that is melting at a very rapid rate. just in one year, the amount of fresh water released by the greenland ice sheet is enough to cover the whole of england with two meters of water. >> or florida. >> or florida, absolutely. >> reporter: if greenland continues to melt at this pace, scientists expect tens of millions of people around the world to face more frequent flooding and displacement by 2030. that's just nine years from now. that's because the ice in the arctic is crucial in regulating the temperatures of the world. affecting more than 90% of the su