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Polynyas are regions of open water near sea ice that are kept from freezing by wind and currents that sweep newly formed ice away.
His team has shown that the population of Adelie penguins breeding on nearby islands dropped 30 percent over the last three decades a decline related to a suite of environmental changes such as less summer sea ice less krill
It's true that the extent of Antarctic winter sea ice has grown over the past few years.
is a much more likely reason that there's a bit more sea ice encircling the South pole e
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