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Expert-reviewed information about the Earth.  For everyone.

    • Refugia Featured Article Refugia Refugia

      Refugia (singular Refugium) are geographical locations where natural environmental conditions have remained relatively constant or stable during times of great environmental... More »

    • Dudleya cymosa (Lem.) Britt. & Rose Featured Article Dudleya cymosa (Lem.) Britt. & Rose Dudleya cymosa (Lem.) Britt. & Rose

      Dudleya cymosa (Lem.) Britt. & Rose is a perennial low-growing succulent plant species that is endemic to California. Having a number of subspecies, this fleshy plant is... More »

    • European otter Featured Article European otter European otter

      The European otter (Lutra lutra) is a broadly distributed marine mammal found in both marine and freshwater systems over considerable portions of Europe, Asia and North Africa;... More »

    • Jamaican dry forests Featured Article Jamaican dry forests Jamaican dry forests

      Jamaican dry forests is an ecoregion that covers a minority of the land area of the nation island of Jamaica, which ranks fifth among the Earth's islands in terms of endemic plant... More »

    • Panamá Featured Article Panamá Panamá

      Panama is a nation of three-and-a-half million people, located between Costa Rica to the north and Columbia to the south. Panama connects the continental land masses of... More »

    • Douglas-fir Featured Article Douglas-fir Douglas-fir

      The Douglas-fir (scientific name: Pseudotsuga) is a genus of tree that includes ar least five species found in North America and... More »

    • Algae Featured Article Algae Algae

      Introduction Algae comprise a diverse group of typically autotrophic organisms, ranging from unicellular to multicellular forms. The largest and most complex marine forms... More »

    • West Nile Virus Featured Article West Nile Virus West Nile Virus

      Since 1999, more than 30,000 people in the United States have been reported as getting sick with West Nile virus. Infected mosquitoes spread West Nile virus (WNV) that can... More »

    • Biomass Featured Article Biomass Biomass

      Biomass is a term in ecology for the  mass of living organisms in a given ecosystem.  Biomass can refer to the living stock of species in a given habitat, but can... More »

Recently Updated
Switzerland Last Updated on 2013-06-18 at 20:12 Switzerland is a landlocked nation of over seven-and-a-half million people in central Europe, east of France, north of Italy.  It is at the crossroads of northern and... More »
Pollution: agricultural operations Last Updated on 2013-06-18 at 14:39 Nonpoint Source Pollution Pollution: Agricultural Operations More »
Pliocene Last Updated on 2013-06-18 at 14:31 Editor's note: The Pliocene is the period of the geologic timescale that spans the era from approximately 5.331 to 2.588 million years ago. It preceeds the Pleistocene... More »
Great Basin shrub steppe Last Updated on 2013-06-18 at 04:23 The Great Basin shrub steppe ecoregion is situated in the most northerly of the four American deserts. Unlike the other three, which have almost exclusive ties to... More »
Nonpoint source Last Updated on 2013-06-18 at 02:18 A nonpoint source refers to a source of pollution from an origin other than a well defined point. The term is most often applied to air pollution, water pollution and noise... More »
Tamarix control Last Updated on 2013-06-17 at 17:10 Tamarix control is a significant invasive species issue in the western USA, especially in the American southwest.  The woody plant genus Tamarix, also , also known by the... More »
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