4 ideas
Deserts hold vast amounts of sand, but most of it is useless for construction. Wind erosion rounds desert grains so smooth that they will not lock together in concrete, so builders need angular sand from rivers, lakebeds and seabeds.
In 2013 Paleram Chauhan, a farmer in a village near Greater Noida outside Delhi, was shot dead in his home after he opposed illegal sand mining on the nearby riverbanks. Beiser uses the killing to show how India's construction boom made river sand valuable enough to sustain organised criminal gangs. These 'sand mafias' bribe officials and use violence against villagers, journalists, police and activists who get in their way.
Dredging sand from rivers lowers the riverbed faster than upstream sediment can replace it. This undermines bridge foundations and embankments, drains adjacent water tables, and lets salt water push inland in deltas. The cost of cheap sand is paid downstream by people who never bought it.
The most advanced industries can rest on an obscure raw material from a single place. Much of the ultrapure quartz used to make the crucibles for growing monocrystalline silicon ingots, and so the world's computer chips, comes from mines around Spruce Pine, North Carolina. Tracing a sophisticated product back to its humblest input exposes fragile, concentrated dependencies that product-level thinking hides.