Wildfires tearing across Southern California have forced thousands of residents to evacuate from their homes. Even more people fled ahead of the hurricanes that slammed into Texas and Florida earlier this year, jamming highways and filling hotels. A viral social media post showed a flight-radar picture of people trying to escape Florida and posed a provocative question: What if the adjoining states were countries and didn’t grant escaping migrants refuge?
By the middle of this century, experts estimate that climate change is likely to displace between 150 and 300 million people. If this group formed
