RICHh AS DIRT

In August 1853, a ship's captain anchored off a few barren Peruvian islands and counted the vessels waiting around him. He reached 140.

They had not come for gold, silver or spices. They had come for seabird droppings, a crust of guano laid down over thousands of years on a coast where it almost never rains. Farmers in Europe and America were wearing out their soil, and this ammonia stinging rock held the two elements their crops could not live without. For a few decades, that dirt was among the most sought after cargo in the world.

Rich as Dirt follows nitrogen and phosphorus, the quiet engines of every harvest, through the fortunes they built and the kingdoms they broke. It begins with a cold Pacific current and the anchovies that feed the birds, then moves through the Inca, who managed the islands with care, and the Lima government that grew so rich it stopped collecting other taxes, until the money ran out and the state defaulted. It crosses to Washington, where a law passed in 1856 let Americans claim islands for their droppings. It climbs into the Chilean desert, where saltpeter towns such as Humberstone rose and emptied, and it sails to the Pacific island of Nauru, whose people once earned more per head than almost anyone alive and now live on a thin ring of land around a mined out center.

Then comes the turning point, a German laboratory that learned to pull nitrogen from the air and changed the economics of every pile of dirt on the planet.

This is narrative history at the scale of an ocean, full of ship captains, bankers, chemists and laborers, and it does not belong to the past alone. About two thirds of the world's known phosphate rock lies in one country, and Peru's guano birds, by one 2025 report, have fallen from about 4 million to roughly 500,000.

If you have ever wondered how a nation can live off a single gift of nature, and what happens on the day it stops giving, this is your book.