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We need to prevent the population of Africa reaching 4 billion by 2100, then.
Universal access for women and girls to education, contraception, abortion is the solution.
Additionally advancing development of Vasalgel and making this freely available in developing countries worldwide.
Once all this has been established, direct cash incentives not to have children would also be suitable. This alleviates poverty and overpopulation.
Or, you know, dealing with China...