Tutorial Reveals Pollution Problems. The manual examines the chemical processes occurring in the biosphere, the cycles of biogenic elements and the main biogeochemical cycles. Concepts of ecosystems, thermodynamic principles in ecology, chemical pollution and its impact on ecological equilibrium are discussed. Designed for students, graduate students of environmental and chemical-environmental specialties of higher educational institutions, teachers of chemistry, biology, ecology, as well as for decision-makers in the field of environmental protection.