1. Antarctic sea ice seemed to resist global warming for decades.
While Arctic sea ice declined rapidly, Antarctic sea ice showed no clear overall loss and even expanded between 2007 and 2015.
Then, after mid-2015, it changed abruptly. www.science.org/doi/10.1126/...
science.org
Compound drivers of Antarctic sea ice loss and Southern Ocean destratification
Recent sea ice loss was initiated by ocean upwelling in East Antarctica and by radiative flux anomalies in West Antarctica.