A study published in Reviews of Geophysics has documented the environmental consequences of accelerated sand and gravel extraction driven by global construction activity. In 2024, approximately 28 billion tonnes of these materials were converted into concrete for building and infrastructure projects worldwide. Research examining extraction patterns since 1974 reveals that demand has more than doubled over the past two decades, with the rate of extraction now far exceeding natural sediment replacement rates.
The geographic distribution of extraction activity is heavily concentrated in Asia, which accounts for more than 80% of current global demand. This extraction surge is primarily driven by urban development and road construction initiatives in China and India. Researchers found that significant quantities of sand and gravel are being harvested from riverbeds across Asia and Africa, though comprehensive data on extraction volumes remains limited in many regions. Where records do exist, extraction rates often exceed natural replenishment by several times over.
The environmental impacts of this overextraction are substantial and multifaceted. Weakened riverbanks, diminished groundwater levels, saltwater intrusion in coastal areas, and deteriorating water quality have all been documented as consequences. To address these challenges, researchers propose implementing satellite imagery and advanced river mapping technologies to better monitor and manage sand and gravel mining operations. Additionally, they recommend reducing demand through more efficient material use and developing alternative resources, including processed construction waste, recycled glass, and treated ash from waste incineration facilities.
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