Except that it's not as easy as packing up and leaving. We have countries, societies. So, maybe Arabian Peninsula becomes a lush rain forest. Does that mean that people there will let the refugees in? Unlikely. They are far more likely to tell 'em to take a hike. Same deal with, say, Russia. Suppose Siberia becomes more hospitable, you think Russians will let outsiders settle there? Why should they? Why would they? Don't forget that just about every coastal country will have its own refugees to deal with. Will India take in 150 million Bangladeshis who are already getting flooded on a yearly basis?
Global warming will be a disaster.
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