The Ecological Crisis of the Aral Sea* Basin in the Frame of a New Time Scale: The ``Anthropo-Geological Scale''
At the end of the twentieth century technology has enabled humans to modify their environment so that in a limited time scale (one generation or less) they can produce changes that would require several centuries or more for natural processes. Human activities move the same volume of sediments each year as that carried to the sea naturally by rivers. Such accelerated changes affect continental dimensions (1000km or more). In this lies the concept of ``anthropo-geological time scale''.