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> Thanks to this attitude birth rates have collapsed in most of developed world and we have 2 pensioners for every child.

Rather thank the politicians who sold you a pyramid scheme as a pension system.

> Between this and climate catastrophy,

If you argue with climate catastrophe, you should rather argue for decreasing the number of people (which includes avoiding having children) to decrease the CO2 footprint.

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Reducing the population by having a low birth rate is good. But mathematically it cannot be so forever. To maintain a non-decreasing population you need 2 children per woman on average, doesn't matter if your country has 10^4 or 10^8 people.

Immigration is only a temporary solution, it may not be a reliable solution by the end of the century. Global birth rates are falling and QoL is slowly improving, reducing the incentive to immigrate.

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