will be. i didn't really understand it until i went up there. i think i have a clip, let's look at this real quick. >> this is the ice layer here. if you were to lick it, it tastes like salt water. >> it's salty. >> whoa, really salty. >> now you know you're on the ocean. snow and ice doesn't seem very complex, but when you get to how all of these things come together to form our sea ice pack and how that is changing, it is all pointing to thinning ice, shrinking ice cover. they measure the sea ice, the land ice, they measure the difference year over year and compare it to what we're experiencing down here. >> what does it mean if they miss that gap, what does it do? >> sies image seen that