service = "natural source of sustenance or subsistence"

[Jonathan Lighter]

  2007 Oliver Morton, in John Brockman, ed. _What Is Your Dangerous Idea?_ (N.Y.: HarperCollins) 52: [In the event of climatic change] the loss of species, both known and unknown, will be experienced by some as a form of damage that goes beyond any deterioration in ecosystem services....One does not have to share the values of these people to recognize their sincerity.

  Morton is a distinguished science writer and an editor of _Nature_.  An asteroid is named for him.

  JL


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