Här är en färsk rapport om isen på Antarktis, forskarna har lite att jobba med att förstå varför den förut ökade och varför den har minskat de senaste åren.
After decades of increases, sea ice in Antarctica is now shrinking
After decades of gradual increases, Antarctic sea ice is now decreasing faster than that in the Arctic, according to new research based on 40 years' worth of satellite data.
Sea ice has a crucial impact on the Earth's climate, says Claire Parkinson, a senior scientist at NASA and the author of the new study published in the PNAS scientific journal on Monday.
Its bright surface reflects 50% to 70% of sunlight back into space. But when sea ice melts, it turns into dark ocean surface, which absorbs 90% of the sunlight. The more light is absorbed, the warmer global systems become.
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But research published on Monday shows things have taken a dramatic turn. Satellite data shows that the yearly average sea ice extent in Antarctica increased until 2014, when it reached a record high. After that, Parkinson said, it started decreasing "precipitously" and reached a record low in 2017.
https://edition.cnn.com/2019/07/01/world/antarctica-sea-ice-melting-climate-intl/index.html