After decades of moderate sea ice expansion, NASA is witnessing something it did not expect. Right now, the amount of sea ice in the Arctic is around as high is it will be all winter, but new records indicate this year's maximum is actually the lowest of any maximum on record. And it's not just the Arctic. NASA satellites also indicate that at the opposite end of the world, Antarctica sea ice hit record lows for the end of the summer. These records lows are not good news for coastlines around the world. Here's what would happen to Earth if all the ice melted.
