After water, sand is the material humanity moves most. We dig it from rivers, beaches and the sea floor faster than rivers and waves can put it back — and almost all of it disappears into concrete.
Up fivefold from 9.6 billion tonnes in 1970. The second most-extracted resource on Earth, after water. UNEP, 2026
Geologists define sand purely by grain diameter: 0.0625 to 2 millimetres, a narrow band on a scale that runs from clay to boulders.
Scale: Udden–Wentworth grain-size classes (Wentworth, 1922). Desert-sand note: UNEP GEAS, 2014.
Extraction rose from 9.6 to about 50 billion tonnes a year between 1970 and 2020 — an average growth of roughly 3.2% a year, compounding.
Solid dots are the two reported values. The dashed path between them is illustrative — a smooth constant-rate curve, not measured annual data. The 2060 figure is UNEP’s projection for the building sector.
Every tonne of cement is mixed with several tonnes of sand and gravel. World cement output doubled in a single decade, driven overwhelmingly by China.
China’s share of world cement: 18% in 1990, 59% at the 2014 peak, ~51% in 2023.
In three years China poured roughly half again as much cement as the US did in a hundred — the fastest build-out in history, and the main reason sand demand bent upward after 2000.
A house is a rounding error next to infrastructure. One kilometre of highway swallows as much sand as 150 houses.
The sand and gravel used in a single year (2012) would build a wall 27 metres high and 27 metres wide all the way around the equator.
A single nuclear power plant was estimated at about 12 million tonnes. Linear bars; tonnes of sand per structure.
Source: UNEP Global Environmental Alert Service, “Sand, rarer than one thinks” (2014).
As rivers and beaches run short, dredgers move offshore. The “sand gap” is the difference between what we take and what nature replaces.
Marine sand dredged every year — UNEP’s central estimate within a 4–8 Gt range.
Dump trucks a day: the volume that 6 Gt a year works out to.
Of dredging companies operate inside Marine Protected Areas — about 15% of dredged volume.
People who depend on small-scale fisheries tied to sandy rivers, coasts and seabeds.
Sources: UNEP Marine Sand Watch (2023); UNEP, Sand and Sustainability (2026).
Sand is cheap because its costs land on rivers, coasts and fishers. Closing the gap means using less and reusing more.
Crushed demolition concrete and recycled aggregate can replace virgin sand in many uses. Ask whether local projects specify it.
Renovation beats rebuild: an existing building’s sand is already spent. Longer-lived structures mean fewer tonnes dredged.
Support extraction permits, traceability and tools like UNEP’s Marine Sand Watch, which tracks dredgers by satellite.
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