Australian Broadcasting Corporation: CHRIS UHLMANN: As Australians prepare for a long hot summer it's fair to say that not many of us are pondering the extent of sea ice in the Arctic.
But scientists say we should be. The extent of the ice melt is both an important barometer and a cause of climate change. The latest satellite data shows the big melt has set in and that means big consequences for everything from walruses to the gases trapped by the permafrost.
At the same time, ice closer to home in the Antarctic is growing but...