In Russia, buildings are sagging and crumbling. In Greenland, a wildfire broke out last year. And in Alaska, entire villages may be relocated because the land upon which they're built is no longer trustworthy. All across the North, the very ground is changing, and the buildings and roads built upon the thawing permafrost are shifting and cracking. In Iqaluit, the capital of the Canadian territory Nunavut, a good home is hard to find.