Since then, humanity has experienced a revolution in living standards. We have now almost completely solved the problem of hunger and sanitation, which has helped to improve health and more than double life expectancy. In contrast to what many feared, this resulted in smaller families, more literate children and the eradication of extreme poverty. The rising middle class, anticipating longer lives for their children, began to abandon violence as a way of solving private and political conflicts, and it began to pay off to invest in the future. The environment had previously been a low priority
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