The MODIS instrument, flying aboard NASAs Terra and Aqua satellites, measures how much solar radiation is reflected by the Earths surface almost every day over the entire planet. Zooming in on Africas Sahara Desert and the Arabian Peninsula, MODIS observed considerable variability in reflectance across the region-from the darkest volcanic terrains to the brightest sand. This matches specific soil ... Full description.

This collection of graphic images, prepared by the Intergovernmental Panel on Climate Change of the United Nations, provides visual information on climate change issues that makes it possible to grasp complex facts more quickly and fully than would be possible through written text alone. The images consist of posters, maps, graphs, and flow charts that present introductory material on climate change, ... Full description.