Originally posted on Matthew Kahn's personal blog: http://greeneconomics.blogspot.com/
At the World Bank yesterday, I learned about this impressive project. While there are a lot of papers to choose from at this website, the "big picture" is sketched below in the report's Executive Summary.
The following is a direct quote:
"This report considers migration in the context of environmental change over the next 50 years.
The scope of this report is international: it examines global migration trends, but also internal migration trends particularly within low-income countries, which are often more important in this context.