Matthew Kahn debates Michael Roberts on the role of adaptability to climate change . A slice from Kahn’s reply to Roberts:
With regards to my Climatopolis work, recall that my focus is the urbanized world. The majority of the world already live in cities and cities have a comparative advantage in adapting to climate conditions due to air conditioning, higher income and public goods investments to increase safety.
My optimism about our ability to adapt is based on migration, competition and innovation.
Another of my former students, Alex Nowrasteh, ponders Bernie Sanders’s opposition to open borders . Here’s Alex’s opening:
I am not surprised that Bernie Sanders is opposed to open borders. There is a long tradition  of socialists, labor unions, and Marxists opposing open borders in the United States. Many left-wing intellectuals oppose liberalized immigration, let alone open borders, because it will destroy political support for redistribution and state control of the economy — and  they  might  be  right .