Reasonably Optimistic Why Americans aren’t having as many kids
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Apr 29, 2026 
Lyman Stone, an economist and demographer who studies fertility and population trends, breaks down why U.S. birth rates have fallen. He discusses delayed parenthood, the role of marriage and cultural shifts, rising parenting standards and anxiety, and policy ideas to encourage larger families. Multiple short takes explore social contagion, historical context, and whether fertility can rebound.
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Fewer People Won't Automatically Help The Climate
- Common environmental arguments for low fertility (fewer people means lower emissions) are misleading historically and empirically.
- Technological innovation and demand growth depend on people; fewer people can reduce incentives to scale climate solutions.
Low Fertility Threatens Retirement Financing And Growth
- Falling fertility has macroeconomic effects: fewer workers to support retirees reduces productivity and strains pensions.
- Children are economic contributors; aging societies risk lower investment and weaker asset bases for retirement finance.
Fertility Differences Can Create Geopolitical Instability
- Demographic decline changes geopolitics: countries with slower fertility falls can gain a military and strategic window over neighbors.
- Disparate fertility trends raise risks for defense, invasions, and international instability.