Let's set an amount and define "largely gone."
The scientific community has a range of predictions concerning an ice-free Arctic Ocean in summer. Some say it could be as early as 2013 or as late as 2100. NSIDC's projections fall somewhere in the lower half of this range. There is consensus and it is not if, but when.
http://nsidc.org/news/press /20081002_seaice_pressrelea se.html
I'm sorry that science is so inconvenient to your ideology, but,...
Well, actually I'm not at all sorry. Your denial of these easily observable facts and fully justified projections just makes anything you have to say on the matter irrelevant.
Name your price and define "largely gone."
If you're so confident that your prediction will come true, why are you so reluctant to back it up with a wager?