The magnitude of the decline in productivity depends on the birth rate, migration costs, trade networks and other local characteristics.
In certain parts of Brazil, the Middle East, India and Australia, productivity is set to decline by as much as 60%, according to the Princeton’s report.
Meanwhile, in certain parts of Alaska, Northern Canada, Greenland and Northern Russia, productivity doubles relative to if there was no global warming at all. Not very clear in that line. Make it a very simple sentence.
Global warming generates migration towards colder regions, which helps boost productivity.