The real solutions are more boring: long-term development, leading to fewer child deaths - and thus to increased confidence in the survival to adulthood of a smaller family - and making family planning available to all (without which Professor Calne's proposals will not work anyway). About one third of Third World pregnancies are unwanted as it is - taxing them will not help.
It is urgent that overpopulation be addressed now. The world is in a stage of transition to an ultimate stable population, but action now or lack of it - can make the difference between the final figure being 8-10 billion, or 15-20 billion. But it has to be the right action.
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