It's time to go.
That is a determination many people are forced to make in their lives, often quite reluctantly.
Parag Khanna, a scholar of globalization, says this is something more of us will say, and SHOULD in the future.
Because humans live in many places that will become uninhabitable, if they haven't become so already.
He lays out examples and provides steps in the book Move:The Forces Uprooting Us. It reminds us that human populations are seldom static, and will be urged into migration by a host of factors in the years ahead.
The author visits to discuss those factors.