Conservation issues are a growing concern for most scientists. As humans continue to consume natural resources, many organisms are headed for extinction. Conservation issues include the protection of trees, animals and wetlands.

Do invasive species pollute the gene pools of other species?

Since the Age of Discovery, we've been toting plants and animals to parts of the world where they don't belong. While most transplants die, some become invasive. How can these newcomers lead to breakneck-pace evolution?

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  • Extinction


    Extinction, the permanent disappearance of species of organisms from the earth. Extinction is usually due to more than one cause. See more »

  • Garbage and Refuse Disposal

    Garbage and Refuse Disposal

    Garbage and Refuse Disposal, the collection and dumping or destruction of food waste and other discarded material. See more »

  • Home Aquariums

    Home Aquariums

    Aquariums are popular decorative features in homes, offices, and even restaurants. See more »

  • Insecticide


    Insecticide, a substance that destroys insects by chemical action. Some insecticides also destroy mites, ticks, and spiders. See more »

  • Irrigation


    Irrigation, the artificial application of water to soil to produce plant growth. In the broadest sense, irrigation includes watering a lawn or garden. See more »

  • Izaak Walton League of America

    Izaak Walton League of America

    Izaak Walton League of America, an organization dedicated to preserving the nation's natural outdoor recreational resources. See more »

  • Pollution


    Pollution, the presence of harmful or irritating substances, called pollutants, in the environment. See more »

  • Reclamation


    Reclamation, making land suitable for human use, usually through irrigation or drainage. See more »

  • Sewage


    Sewage, the mixture of water and waste products carried off through a drainage system of underground pipes, or sewers. See more »

  • Sierra Club

    Sierra Club

    Sierra Club, a United States organization concerned with the preservation of the world's natural environment. See more »

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