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A characteristic of the present global ecological situation is increasing instability or— put another way—a crisis in the civilization system, the global scale of which is expressed through a deterioration of human and animal habitats. The most sub­ stantial features of global ecodynamics of the late 20th and early 21st centuries include the rapid increase in world population (mainly in developing countries), increase in the size of the urban population (considerable growth in the number of megalopolises), and increase in the scales of such dangerous diseases as HIV/AIDS, hepatitis, tuberculosis, etc.