So? The planet is already overpopulated and running out of resources. A decline in global populations would be a good thing.
Really? Because Italy had 379,890 births last year.
So they bring in immigrants. The immigrants learn Italian, and become Italian citizens. Give them advanced classes in waiving their hands around while they talk...
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So your problem is the "wrong kinds" of people are reproducing, not that the human race is doomed to extinction. This sounds like a personal problem.
Stop being an asshole, and I will happily leave you alone.