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...have their own term for nature's gifts - ecosystem services. Simply defined, ecosystem services are the benefits to people derived from natural goods and functions of ecosystems. Ecosystem services can be classified into four broad categories...
http://peninsulaclarion.com/outdoors/2012-12-27/natures-gifts-and-our-public-lan
Outdoors
...quantified these values and found that the Chugach National Forest provides as much as $1.2 billion annually in ecosystem services (such as clean air and water), direct use values, community benefits, and other noncommodity values. Just...
http://www.peninsulaclarion.com/stories/072707/letters_2998.shtml