Worldwide, human lives are rapidly improving. Education, health-care, technology, and political participation are becoming ever more universal, empowering human beings everywhere to enjoy security, economic sufficiency, equal citizenship, and a life in dignity. To be sure, there are some specially difficult areas disfavoured by climate, geography, local diseases, unenlightened cultures or political tyranny. Here progress is slow, and there may be set-backs. But the affluent states and many...