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Expert-reviewed information about the Earth.  For everyone.

    • 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 »

    • Serengeti Featured Article Serengeti Serengeti

      The Serengeti is a plain immediately south of the equator in eastern Africa covering over 30,000 square kilometers (12,000 square miles) east of Lake Victoria in northwestern... More »

    • Ecological pyramids Featured Article Ecological pyramids Ecological pyramids

      Ecological pyramids are diagrams that illustrate how ecologically important factors, such as energy, biomass, and population size, vary between trophic levels in an ecosystem.... More »

    • Petrochemicals Featured Article Petrochemicals Petrochemicals

      Petrochemicals are chemical products made from the hydrocarbons present in raw natural gas and petroleum crude oil. The largest petrochemical manufacturing industries are to... More »

    • 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 »

    • Rooftop runoff contamination Featured Article Rooftop runoff contamination Rooftop runoff contamination

      [The lead author of this article is Dennis Lye] Rooftop runoff contamination is receiving increasing attention as environmental and health issues, particularly as human... More »

    • DNA Featured Article DNA DNA

      Deoxyribonucleic acid (DNA) is a long chain organic molecule that contains the coding for all metabolic and reproductive processes of all living organisms, save for certain... 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 »

Recently Updated
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 »
Chihuahuan Desert Last Updated on 2013-06-16 at 21:48 The Chihuahuan Desert encompasses one of the most biologically diverse arid regions on Earth. This ecoregion extends from within the United States south into Mexico. This... More »
Colorado Plateau shrublands Last Updated on 2013-06-16 at 21:44   The Grand Canyon epitomizes the Colorado Plateau, an area that has been called the "land of color and canyons." The Plateau can be thought of as an... More »
Mojave Desert Last Updated on 2013-06-16 at 21:42 The Mojave Desert is the smallest of the four American deserts. While the Mojave lies between the Great Basin Shrub Steppe and the Sonoran desert, its fauna is more closely... More »
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