Graykeeper, it is good to see your name again. Where I don't usually agree with you you usually contribute a lot to a conversation.
While I don't know if the arctic ocean has been ice free or not, We do know it has been MUCH smaller than it is now as there is a massive spruce forest under the ice in greenland. 
Erosion has been going on for 4 billion years, no evidence that it will stiop any time soon. In addition, both the Atlantic and Pacific are kinda big and have wind to. Earth continues to spin. need I point out that wind is caused by cold/warm air meeting? Why would reduction of cold air increase wind?
Prudhoe bay? Lets look at the key words of your point. -Winds howling-moceans swell-Really big wind-severly erode-sea levels rise-(and not just a little but) -much to high-most dangerous- destructive- last bear dies- Prudhoe bay dies.
I mean, were talking end of the world here, and all mecause the CO2 content went up from 300 parts per MILLION to 400 parts per MILLION.