As I wrote a year ago Climate Migration(Climate Change is Driving Migration North), people moving north to escape the heat, will be a dominate force in years to come. The NY Times has an article on this in their magazine,
THE GREAT CLIMATE MIGRATION
By 2070, the extremely hot zones that now cover less than 1 percent of the Earth’s land surface — like the Sahara — could cover almost 20 percent. Water sources would vanish. Farms would go barren. And hundreds of millions of people would be forced to choose between flight or death.
The Times Magazine and ProPublica have modeled what that migration could look like. “Northern nations can relieve pressures on the fastest-warming countries by allowing more migrants to move north across their borders, or they can seal themselves off, trapping hundreds of millions of people in places that are increasingly unlivable,” Lustgarten writes.