[AChimp]

The melting of the ice caps would have serious implications for Earth's climate. For one, where would all that water go? The polar icecaps are over three MILES thick in some places. That's a huge shitload of water, and is bound to increase water levels substantially all around the world. It's not like they would melt and the water would just vanish because it's convenient.

Not to mention the fact that there is no arable land up North! There may be some here or there, but it's called tundra for a reason. In a lot of places, there's just a few inches of soil, and then you hit solid rock. Can't really grow much, unless we all start eating lichen.

EDIT: In which case, I might add, Canada would have the market cornered. We are the world's largest producer of mossy rocks.