the extent of ice melt here in greenland will help determine just how high sea levels will rise. all this ice that's fallen off has been since we've gotten here. we've been hearing it and seeing it falling off. and it's going into the ocean. what happens? >> we are on the first step of a domino. >> reporter: because what happens in the arctic doesn't stay in the arctic. >> we've only had seven inches of sea rise globally in the last century. it doesn't sound like much but it's already affecting the intensity of coastal flooding. >> reporter: those rising sea levels and warmer oceans fueling more powerful hurricanes like dorian, which devastated the bahamas. and wildfires. alaska, 2.5 million acres burned. >> the link between climate