Open Borders and the Environment

My Open Borders neglects two major worries about immigration.

The first is contagious disease; I did not see that one coming, though I try to remedy my oversight here.

The second omission is less excusable.  Somehow I failed to address immigration’s environmental effects.  Here’s what I should have said – and what I will say if there’s ever a second edition.

1. The obvious environmental objection to immigration is that it raises population and therefore leads to more pollution and other negative...