Yes, threats to global sustainability are clear and present dangers. But the 10,760-fold increase in aluminum production reported by environmentalist Clive Ponting, or the 380-fold increase in oil production, or even the 24-fold increase in global GDP over the course of the last century isn't driven by population growth. It is growing consumption per person that is the problem.
And that, of course, is not the fault of Africans. The blame lies with wealthy countries that do nearly all of the consuming. The poorest 650 million people on the planet live on about 1 percent of the income of the richest 650 million. Each year, we add 1 percent or more to the incomes of those richest people - GDP per capita growth rates in wealthy countries are at least that high. And that 1 percent growth has the same impact on global consumption as would doubling the number of people living on the income of that bottom 650 million of the world's population. So, those people sitting in rich countries pontificating on unsustainable global populations might want to start off with the bit of that population they see in the mirror every morning.
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