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 table displays the Carbon economic efficiency for 141 countries in metric tons per U.S. dollar of gross domestic product (GDP). The data can be displayed in order by rank (first to last), or in alphabetical order. Each country's name is a link to additional environmental statistics about it: CO2 emissions, ecological footprint, endangered species, and others. There is also a link to an interactive ... Full description.