Albedo their reflectivities. Fresh 'black' ice exhibits Fresnel reflection. Snow on top of this sea ice increases the albedo to 0.9. Cloud albedo has substantial influence over atmospheric temperatures. Different types of clouds exhibit different reflectivity, theoretically ranging in albedo from a minimum of near 0 to a maximum approaching 0.8. "On any given day, about half of Earth is covered by clouds, which reflect more sunlight than land and water. Clouds keep Earth cool by reflecting sunlight, but they can also serve as blankets to trap warmth." Albedo and climate in some areas are affected by artificial clouds, such as
Albedo One "The Mammoth Encyclopedia of Science Fiction", notes that "Recent issues have boasted a printed cover, but the magazine still contains a black-and-white photocopied interior" and could "from the purely aesthetic point of view, benefit from some enhanced production values". The entry continues to note that "the editorial and literary quality of the contents more than makes up for this". However, Mann's inclusion of some genre magazines like "Albedo One" as opposed to other available magazines earned some criticism from reviewers, with one reviewer from the online edition of The Zone commenting that "Ireland's "Albedo One" rates a plug... But where