Elvia León, the youngest of seven children, wanted to leave Bomintzhá back in 1987. “I told my mother that I didn’t want to live in that kind of poverty, and she supported me.” Her father was less pleased with her plans to abandon their small community in Mexico’s Hidalgo state to study in the city of Querétaro. “The culture here is that women are meant to be at home, doing domestic chores.”

In the quarter century the Wilson Center’s Environmental Change and Security Program has been pondering the issues for which it’s named, the world’s demographic future has been wobbling. A key concern of analysts: How many people will farmers need to feed in 2050? Mainstream projections have teetered between 8.9 billion and 9.8 billion, amounting to an increase of between 13 and 21 percent over today’s 7.7 billion. This significant variation in projections is rarely acknowledged by prognosticators. Many simply round up today’s latest guess and state confidently that there will be 10 billion people in 2050—though just a few years ago, the number most confidently stated was 9 billion.

First published 30 years ago in the National Interest, Francis Fukuyama’s landmark essay, “The End of History?,” argued that, with the fall of fascism and communism, no serious blueprint for modern-state development lay open, save for those paths that would ultimately embrace both political and economic liberalism. Over the past two decades, movement toward this ideal end-state has trickled to a halt. Instead, the political elites of Eurasia’s regional powers—Russia, Turkey, Iran, and China—have crafted stable illiberal regimes that borrow whatever they need from free-market economics, electoral politics, nationalism, and religion. Their ascent has produced a form of “non-endpoint stability”—two mutually antagonistic camps: one composed of liberal democracies, the other a mix of illiberal hybrids. As long as these camps remain stable, the international system falls far short of Fukuyama’s theoretical end of history.

Exactly 25 years ago the international community met in Cairo for the 1994 International Conference on Population and Development. In the aftermath of the Cold War, ethnic conflict seemed to be exploding globally and research on the role of population growth and resource scarcity found an eager audience among policy makers struggling to understand this new international disorder. ECSP’s founding in that same year positioned the program as a leader in bringing together the scholarly and policy communities around non-traditional security issues over the last 25 years. The last two-and-a-half decades have brought tremendous change in population trends, environmental change, and the security landscape. Over the next 25 years three trends will shape the agenda of those working on the nexus of population-environment-security issues.