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Sand and the Modern World
Host Roman Mars of the podcast 99% Invisible looks at the topic of sand, at first glance what seems like a boring and inconsequential feature of the world. But, says Vince Beiser, author of The World in a Grain, "Sand is actually the most important solid substance on Earth. It is the literal foundation of modern civilization."
Sand is a fundamental element in concrete, asphalt, and glass, which means most buildings, roads, and windows depend on sand. But we use 50 billion tons of sand every year, and the world supply is starting to run out, says Beiser.
The vast reserves of desert sand are useless since wind-shaped grains are too smooth compared to those formed by water erosion. In addition, the environmental damage that results from taking sand from rivers and oceans is immense. As cities have grown and sand has become a more valuable commodity, violence and corruption have also followed, notes Beiser.
Beiser traces the history of the most influential sand-based product—concrete—from ancient Rome to the invention of reinforced concrete at the turn of last century to the rise of massive cities in developing countries. He says that the sand needed to make concrete is not going to just disappear suddenly, but the efforts needed to extract from the dwindling supply will be more destructive.
While concrete is a valuable building material, Beiser argues that we use too much of it and we need to think about how to consume less in general. Alternative building materials are also part of the solution—bamboo, shredded plastic, recycled tires, and hemp, for example. Mass timber, layered sheets of compressed wood, is another promising option that could potentially provide large quantities of sustainable building materials, reports Mars.