Each winter the sea ice that forms around Antarctica effectively doubles the size of this massive continent. It’s one of the biggest annual global changes. It reflects sunlight, drives ocean currents and is home to a host of critters key to the Antarctic food web. But the last few years have seen unusually low sea ice extents in Antarctica, and scientists are sounding the alarm. Is this a blip, or a trend? Go to this episode on rnz.co.nz for more details
New Zealand