Richer countries will find ways of dealing with this. In London, for instance, there is already a Thames Barrier, so water can be blocked out when the tides are higher. It will not be too difficult to raise the barriers further. But for cities banking the seaside, or for islands like Singapore and the Maldives, the solution will be much less straightforward. Migration within a country is also less problematic than cross-border migration. If the coastal areas of China are affected, for instance, people have the option of moving inland. There will be economic consequences, but the political
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