Not everyone who is a sceptic about the benefits of migration is a nativist. On the contrary, many progressive opponents of migration cite the harm that is done when people leave poor countries to make better lives in wealthy ones. The grounds for their opposition vary, but two particulary common reasons given are climate change and brain drain. Here, for example, is Rupert Read, philosopher and Extinction Rebellion spokesperson, [writing in The Ecologist in 2014](

>There must be absolutely no compromise whatsoever on the humanity and rights of immigrants, and on our responsibility to welcome and help to integrate those who are here. But we ought to accept the power of the reasoning that shows that a high level of immigration leads to significant problems – here, abroad, and in the future. It …increases  net environmental footprint – people migrating here whether from Estonia or East Africa suddenly jump their footprint dramatically: this is bad news of course for all things ecological / for future generations.

Other writers, two numerous to mention here, are worried about “brain drain” and the decision of wealthy professionals to take their skills, often developed at the state’s expense, to rich countries when there are so many people locally who need doctors, nurses, teachers and hedge-fund managers.
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