GEOG M109 Study Guide - Midterm Guide: Soil Salinity, George Perkins Marsh, Dryland Salinity
Document Summary
In the late 18th and early 19th century, studies of torrents of the alps greatly enhanced the realization of human capacity to change the environment. Great droughts (dust bowls/storms in prairies of midwest usa) Poor agricultural practices and years of sustained drought caused the. Plains grasslands had been deeply plowed and planted to wheat. During the years when there was adequate rainfall, the land produced bountiful crops. But as the droughts of the early 1930s deepened, the farmers kept plowing and planting and nothing would grow. The ground cover that held the soil in place was gone. The plains winds whipped across the fields raising billowing clouds of dust to the skies. Reasons for the resurgence of interest in environmental issues: Development of earth system sciences and climate models (coupled models) Conferences and organizations, such as the intergovernmental panel on climate. In 1800, alexander von humboldt noted that the water level of lake valencia in.
