What a billion square feet of warehouses looks like

California’s Inland Empire, a sprawling region just east of Los Angeles that was once known for orange groves and grape vineyards, is now ground zero of America’s warehouse boom. The rise of online shopping has triggered a dramatic change in the landscape here and across the country — every $1 billion in online sales drums up demand for 1.25 million square feet of warehouse space.

Now, there’s an estimated 1 billion square feet of warehouses in the Inland Empire alone, according to a new analysis by the Robert Redford Conservancy for Southern California Sustainability at Pitzer College. That’s nearly 37 square miles of warehouses.

The austere concrete boxes are relatively new transplants to the region, as an animated map released by...

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