Go and get an ice cube out of the freezer. Go on. I'll wait.
Got one? Whaddya mean no? Okay, let's do it as a thought experiment. Imagine an ice cube melting. Slowly disappearing into a small puddle, maybe cracking as it does so.
It melts in three dimensions. It doesn't melt from the sides first, or from the top down.
That's what makes the news that the Arctic Sea Ice has melted to a new low so scary. This data just measures the top of the ice, the bit we can see from the satellites. What's happening to the thickness of the ice? What's happening underneath? That data will come out shortly, but it doesn't look good.
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