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Soil Problems (Soil Salinization) In countries with arid and semiarid regions,the decrease in agricultural production due to excessive salts is a very serious problem.Production of waste concrete in China The accelerating urbanization in China in the recent years has led to a large quantity of demolitions of infrastructures.These demolitions,as well as the construction of new buildings,have led to a great deal of construction and demolition (C&D) wastes.