Which is fair enough, and they're talking about temps 11 degrees F higher and seas of Al Gorean proportions... but considering the average elevations of land and how much frozen turf there is, we'd be talking about humans living in areas further north, if they did have to live. People would have to move, if temps were tied this tightly to CO2, but they most definitely would live, and might even find nicer digs.
Interesting. Thanks.