Welcome to tomorrow today the science show on d w. Is this really ice it is under polarized light ice shimmers in a rainbow of colors. And this is where it comes from the arctic weather sea ice has been declining for decades. And International Research group spent a year studying it to get a better understanding of Climate Change and its impact. Think. Well take winter is a black void in 2 senses 1st its dark thanks to months of nights in which the sun no longer rises over the horizon plus theres a huge data hole we know precious little about when tearing the area around the north pole which plays a major role frog. Climate and is itself changing the ice has been receding for decades now what explains this Climate Change sure but how exactly does that affect this northern most part of the planet because if so how is the sea ice changing how does it grow in the winter and how does it melt in the summer. Christian hans is a sea ice geophysicist in the us could be in the institute in germ