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Some conservationists argue that , though an ecosystem may not be returned to its original state , the functions of the ecosystem ( especially ones that provide services to us ) may be more valuable in its current configuration ( Bradshaw 1987 ) .
 person: Bradshaw
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 person: Bradshaw