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On the basis of the newest glaciological & oceanological data, global changes in the atmosphere's temperature & gas composition over the last climatic cycle are described & a strict correlation between them is demonstrated. Paleographic analysis demonstrates the nature of changes of geographic zones & landscapes in the northern hemisphere during the Upper Pleistocene & Holocene epochs. Climatic changes & glacierization in the 20th century & the progress & possible causes of the rise of the world ocean level are analyzed. Using the well-known forecase of a global temperature rise in the 21st century, possible patterns of change in natural conditions in the North, in temperate zones, & in southern latitudes of the northern hemisphere are considered. It is stressed that anticipated global warming will not necessarily lead to a global environmental crisis, but will signify a transition to new conditions calling for profound societal adaptation. 2 Illustrations, 30 References. Adapted from the source document.