Some truth above, but modern politics is sure to get in the way. It used to be possible for humans to migrate to follow food supplies (and human populations were far smaller). Are we prepared to allow millions and millions of people to move north across international boundaries so they can live and work where we are now? Are we prepared to have those who dwell along coastlines move inland across international boundaries? We should probably prepare for this, but if we can moderate and/or slow climate change shouldn't we do that also?

The course we are on now (thanks to our government) is to ignore the problem, and let our kids and grandkids face the social and economic upheaval (and probable armed conflicts) that will result from mass displacments (whatever the level of human causation of climate change).