Describes the changes taking place as a result of the depletion of groundwater supplied by the Ogallala aquifer. Provides maps and tables which show changes occurring in agriculture, and reports the results of a survey of residents' opinions on potential solutions to the problem. (JDH)

The Windsor-Quebec City axis is Canada's most important economic entity. The axis comprises four distinct physiographic units, with considerable climatic variation across the area. Containing two distinct linguistic groups (English and French), the axis has a rich agricultural system and is the manufacturing heartland of Canada. (RM)

Reviews the tremendous transformation that human beings have wrought on the earth's surface from the Holocene to the present. Traces this transformation through various stages: the emergence and development of agriculture, agricultural impact and land degradation, ecological and political imperialism, industrialization, and environmental…