There is currently about six trillion tons of Arctic sea ice. All that alarmists have to do is melt that in the next week or two, before the melt season shuts down. They just need to melt about one trillion tons of ice per day.
And President Obama’s science adviser predicted ice-free winters.
…if you lose the summer sea ice, there are phenomena that could lead you not so very long thereafter to lose the winter sea ice as well. And if you lose that sea ice year round, it’s going to mean drastic climatic change all over the hemisphere.