A homemade problem

In terms of geology there exists in Germany no shortage of sand, gravel and natural stone deposits. Quartz and building sands are available in Germany in sufficient quantities to cover domestic requirements. But there currently exist nevertheless considerable supply shortages in various regions of Germany, especially for important construction raw materials. The reason for this is an artificial scarcity caused by the fact that a large portion of the sand deposits is located in nature preserves below residential and industrial estates. In addition, potential raw materials resources of similar...