At last year’s United Nations summit on sustainable development, world leaders vowed to provide “free, equitable, and quality” primary education for all children, by 2030. But for millions of kids, it will not come in time—and probably not even in the next 50 years.

The Sept. 5 Global Education Monitoring (GEM) Report by United Nations Educational, Scientific and Cultural Organization (UNESCO) shows that economic inequality will keep the world from achieving education for all anytime soon. The report uses past trends to project when different countries will achieve “universal education,” defined as 100% of children enrolled in school. Its findings are grim: The world’s poorest countries will reach universal primary-school education more than a century after the richest nations.

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