Global warming is a win-win situation. First, we've finally thwarted the Vikings! Second, when California is submerged, we can hand it over as a homeland for the illegals.
Actully, it was global COOLING from the little ice age that led to the Viking retreat from Vinland (modern day Newfoundland and Canada), and Greenland.
The ice clogging the fjords that the Vikings used to communicate with their brethren in Scandinavia was the last straw, leading to the abandonement of Greenland.
Ironically, the Inuit found the Little Ice Age to be quite enjoyable to their way of life, which is why they moved in as the Vikings moved out. Global warming doesn't kill the planet, just those who can't adapt. And for those who can, there is continued existence.