Center for Sustainability and the Global Environment

The Center for Sustainability and the Global Environment (SAGE) which is at the University of Wisconsin-Madison provides a wide range of data on natural resources, human impact, and climate change. Their site includes a number of downloadable maps and datasets on topics such as land use, river discharge, and soil quality. They also publish as an educational resource the Atlas of the Biosphere which provides a wide array of information on environmental resources including maps, schematics, and GIS datasets.