The Second-Most-Extracted Substance on Earth Has No Global Rules

After water, the resource humanity consumes most is sand. Roughly fifty billion tonnes of sand and gravel are extracted every year, according to the UN Environment Programme — a volume the agency has described as enough to build a wall twenty-seven metres high and twenty-seven metres wide around the entire planet. It goes into concrete, asphalt, glass, and land reclamation. It is the physical substrate of urbanization. And unlike oil, timber, or fisheries, it is governed almost nowhere by anything resembling a coherent international framework.

The first counterintuitive fact is that the world can run short of sand while deserts cover a fifth of the land surface. Wind-blown desert grains are too smooth and rounded to interlock in concrete; construction requires the angular sand produced by water. That confines extraction to rivers, lakes, floodplains, coastlines, and the seabed — which is to say, to precisely the ecosystems that regulate sediment supply, buffer storms, and support fisheries. UNEP's 2026 assessment notes that around half of the world's dredging companies operate within marine protected areas, and flags shallow-water mining of magnetite-rich "black" sand as an emerging front.

The damage compounds in ways that rarely appear in extraction statistics. Removing sand from a riverbed lowers the channel, which draws down the surrounding water table and can pull saltwater into coastal aquifers. It undermines bridge piers and embankments; collapses attributed to upstream sand mining have occurred across South and Southeast Asia. Deltas starved of sediment — by dams upstream and dredging downstream — subside faster than the sea rises against them, which means sand extraction and sea level rise are not separate threats to the same coastline but the same threat approaching from two directions.

Where the resource is valuable, unpriced, and weakly policed, the predictable happens. Illegal sand extraction is a significant criminal economy in several countries, associated with violence against journalists, officials, and local residents. Legitimate operators, meanwhile, face a governance structure that UNEP describes as fragmented across ministries with no single body accountable for long-term stewardship, and decision-making that rarely incorporates sediment budgets or cumulative ecological effects. Sand is treated as a commodity that happens to sit in a river, rather than as part of the river.

There is a further irony worth sitting with. Climate adaptation is itself a driver of demand: seawalls, raised roads, replenished beaches, and reclaimed land all consume enormous volumes of aggregate, and demand for construction sand is projected to rise substantially by mid-century. The infrastructure we build to protect coastlines is partly built from the sediment those coastlines need. Without accounting for that loop, adaptation spending can quietly erode the natural defenses it is meant to supplement.

The remedies are not exotic. Recycled concrete aggregate, manufactured sand from quarry rock, mine tailings, and dredged material from navigation channels can all substitute for a share of virgin extraction. Design standards that reduce concrete volumes cut demand at the source. What is missing is the prior step: recognizing sand as a strategic resource with a measurable stock, a replenishment rate, and a price that reflects both. Until a substance is counted, it cannot be managed — and fifty billion tones a year is a great deal of material to be moving without a ledger.