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Pages 49-52

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From page 49...
... Essential characteristics of the roots are: scientifically valid observation systems yielding quantitative data placed in the public domain; · measurement of multiple variables at nationally and internationally distributed locations by a mixture of directed and volunteer organizations; and public funding with possible purchase of data from the private sector under appropriate circumstances. Characteristics of the trunk include the following: systematic validation and synthesis of data into a limited selection of core information products that directly or indirectly serve all user groups; · full and open access (provided without restriction for no more than the marginal cost of reproduction)
From page 50...
... Characteristics of the leaves are: · great diversity; · changing numbers and identities resulting from new, commonly unforeseen uses of environmental information; and · rapidly increasing practical importance due to the growing public awareness of environmental issues. Of course, in the real world environmental information systems cannot be described as a single tree or even a grove of trees.
From page 51...
... In contrast, public agencies can subsidize creation of the system and deliver information at its marginal cost to all potential users, thereby maximizing net social benefit. Recommendation.


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