The vast expanse of the Sahara Desert, covering millions of square kilometers, holds sand that is not suitable for construction. Unlike the angular grains needed for concrete, desert sand is smooth and rounded, making it ineffective as an aggregate in building materials. This challenge is evident in places like Dubai, where despite being surrounded by desert, the city imports massive amounts of sand from countries like Australia to support major projects such as the Burj Khalifa and artificial islands. Similarly, Saudi Arabia has also sourced sand from abroad for its infrastructure needs. Globally, the demand for sand and gravel far outpaces natural replenishment. A 2022 report by the United Nations Environment Programme (UNEP) states that nearly 50 billion tons of sand and gravel are extracted annually—four times more than the amount naturally produced by oceans and rivers each year. This figure is consistent with earlier estimates from 2019, which also identified sand as the most consumed solid material on Earth. The slight differences in numbers may stem from whether the reports consider sand alone or sand combined with gravel. The scale of sand extraction is staggering. According to the Norwegian foundation GRID-Arendal, the world uses about four times more sand annually than is naturally replenished. Building a single-family home requires about 200 tons of sand, while constructing a single kilometer of highway can consume up to 30,000 tons. This demand is especially high in China, the world's largest consumer of sand, driven by rapid urban development and infrastructure growth. To meet this immense demand, the construction industry has increasingly turned to extracting sand from the ocean floor. Using industrial dredgers, coastal sediments are being removed on a massive scale. Between 2012 and 2019, between four and eight billion tons of sand and sediments were extracted daily from the oceans, according to UNEP, using geolocation data and artificial intelligence. This activity has caused significant environmental damage, including the disappearance of islands. For example, Singapore has expanded its territory by purchasing sand from neighboring countries, leading to the disappearance of about 20 Indonesian islands. This process also accelerates coastal erosion, with nearly 75 to 90% of the world's beaches receding. The environmental impact of sand extraction extends beyond coastal areas. In India, the sand mafia has become a powerful criminal network operating at over 8,000 sites, often using forced labor. In Morocco, illegal sand mining has worsened coastal degradation, creating barren, lunar-like landscapes. According to a report cited by Moroccan authorities, half of the country's annual sand usage—10 million cubic meters—comes from illegal extraction. The city of Mohammedia, situated between Rabat and Casablanca, has seen severe coastal damage as a result. To address the growing shortage, the construction industry is exploring alternatives such as crushed sand from limestone or granite quarries and recycled materials from demolished buildings. However, these options are limited in scale and cost. Quarry sand is more expensive to produce, and recycling requires careful sorting to remove impurities. Currently, these alternatives cannot meet the global demand of 50 billion tons of sand per year. Meanwhile, desert sand remains unsuitable for construction, and dredgers continue their operations at the ocean's bottom.