Some people are fearful of losing their national identities in a flood of immigration.
However, in many countries we are seeing falling birthrates and a fear of how we will finance things in future.
Being seen as tough on immigration is a vote winner. This is being exploited in many countries by the hard right parties.
In the end I do not have an answer. As the planet warms up, we can expect more migration to milder countries from those that are very hot.
The answer in the end is probably to acknowledge that some controlled migration is a good thing.
It is important that people are well accepted by their new countries and that they learn to integrate. At the same time, they bring new ideas with them which we, in turn, must learn from. Think of the USA in past centuries and the Huguenots coming to England.

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