The man himself is causing the depletion of the land. The primeval forest with its leaves, roots and creeping plants has to some extent contributed to the prevention of direct soil erosion. Nowadays, people cut down forests, exposing the land, and solids are washed out much faster than in primitive times, when sewage, garbage, sewage, and waste were returned to the soil again. Now people clean the land of waste and sewage and all waste products eventually enter the ocean. Man extracts iron, tin, copper, zinc and other minerals from the earth's bowels, using them in the production of various structures, equipment, objects necessary for the modern level of civilization. In the end, all of them are worn out, destroyed, dumped in garbage piles, where they are exposed to various processes - corrosion, rotting, combustion, dissolution - as a result, and washed out in the sea. Huge amounts of substances are destroyed by burning as fuel or by destroying waste. All of the coal, most of t