FOREIGN AFFAIRS MAGAZINE (March 4, 2025):

ince the mid-twentieth century, the power dynamics and system of alliances that made up the postwar global order provided a strong check on campaigns to conquer and acquire territory—an otherwise enduring feature of human history. But rather than marking a definitive break from the aggression of the past, this era of relative restraint now seems to have been merely a brief deviation from the historical pattern. From Russia’s invasion of Ukraine to U.S. President Donald Trump’s avowed interest in acquiring Greenland, international land grabs are back on the table. Threats of territorial conquest are once again becoming a central part of geopolitics, driven by a new phase of great-power competition, growing population pressures, shifts in technology, and, perhaps most crucially, a changing climate.

International land grabs are back on the table.

The case of Greenland is emblematic of how climate change may spur a global contest for land. Trump first raised the prospect of the United States incorporating the Danish territory on the eve of his inauguration, and in the weeks since, he has reiterated that wish and refused to rule out the use of force to turn it into reality. Denmark is uninterested in selling Greenland, and the territory’s largely indigenous population is wary of outside powers—a legacy of the island’s brutal history under Danish rule. But that has not discouraged Trump’s overtures or threats. His interest in the territory stems ostensibly from its strategic position as a buffer between the United States and its great-power adversaries. “It has to do with the freedom of the world,” Trump said in January. But as the planet warms, retreating icecaps and thinning sea ice will make Greenland important for other reasons, as its vast tracts of once inhospitable land become newly alluring to outsiders.

Climate change will create problems for some countries and opportunities for others.

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International agreements and alliances, already fraying as great-power competition heats up, will struggle to contain these fights. In a world where might makes right, countries that find themselves seeking new territory may not hesitate to use force to get it. With the most dramatic effects of climate change still to come, the race for land is just getting started.

Michael Albertus is Professor of Political Science at the University of Chicago and the author of Land Power: Who Has It, Who Doesn’t, and How That Determines the Fate of Societies.