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1999. Land used for agricultural production presents a tradeoff to society. On one hand, agricultural lands provide essential food, feed, fiber, and incr... University of Minnesota. Institute on the Environment.
1999. National Geophysical and Solar-Terrestrial Data Center. This map shows light sources from human settlements around the world observed during 1999. The Defense Meteorological Satellite Program (DMSP) Oper... National Geophysical and Solar-Terrestrial Data Center.
1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, and 2004. National Center for Ecological Analysis and Synthesis. This raster dataset shows the intensity of ultraviolet (UV) radiation reaching the surface of Earth from August 1996 to July 2004 as part of the GS... Science.