Antarctic sea ice reached a record high this year, topping 20 million square kilometers (nearly 8 million square miles) in September - a milestone it hadn't touched since 1979. It's a fact climate change deniers are fond of repeating. If the planet is warming, shouldn't sea ice be melting away rather than growing? It's true that the phenomenon is a confusing one - but it's no proof that climate change isn't happening. In fact, scientists believe that climate change is actually responsible for the strange events down in the Antarctic. Walt Meier, a scientist from NASA's Goddard Space Flight Center, explains how this is possible in a new video from Science@NASA. The first thing to note is that sea ice and land ice are two completely different things. Sea ice is simply frozen ocean water, which forms a layer of ice on top of the sea. Land ice originates on land, forming from compacted snow to form glaciers and ice sheets. Land ice melting into the oceans is what causes sea levels to rise

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